Details of the Researcher

PHOTO

Takehito Shimatsu
Section
Frontier Research Institute for Interdisciplinary Sciences
Job title
Professor
Degree
  • 博士(工学)(東北大学)

Education 2

  • Tohoku University Graduate School, Division of Engineering 電子工学

    - 1988/03/31

  • Tohoku University Faculty of Engineering 電子工学

    - 1986/03

Professional Memberships 4

  • 米国電気学会磁性分科(IEEE,Magnetics Society)

  • 日本金属学会

  • 日本磁気学会

  • エレクトロニクス実装学会

Research Interests 6

  • 超高真空

  • 磁性薄膜

  • スパッタリングプロセス

  • 磁気記録媒体

  • 原子拡散接合法

  • 室温接合技術

Research Areas 3

  • Nanotechnology/Materials / Thin-film surfaces and interfaces /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /

  • Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electric/electronic material engineering /

Awards 21

  1. Best Poster Presentation Awards

    2024/11 Institute for Advanced Micro-System Integration (IMSI) Blade Test to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding with Amorphous Si and Al Films

  2. 244th ECS Meeting Best Student Paper Award

    2023/10 The Electrochemiacl Society Blade Test in Atmospheric-Pressure Ar Gas to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding

  3. 244th ECS Meeting Best Paper Award

    2023/10 The Electrochemiacl Society Preferred Grain Orientation to Enhance Interdiffusion at Room Temperature in Atomic Diffusion Bonding: A Fundamental Study using Ni and Cu Films

  4. 第32回マイクロエレクトロニクスシンポジウム(MES2022)ベストペーパー賞

    2023/09 一般社団法人 エレクトロニクス実装学会 Cuを微量添加したAg薄膜を用いた大気中の原子拡散接合法における接合性能

  5. Best Presentation Award in 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021)

    2021/10 IMSI (Institute for Advanced Micro-System Integration) Atomic Diffusion Bonding using AlN films

  6. Best Presentation Award in 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021)

    2021/10 IMSI (Institute for Advanced Micro-System Integration) Surface Contamination Effects on Bonding Performance in Atomic Diffusion Bonding of Wafers using Amorphous Si Thin Films

  7. Best Poster Presentation Award, 2019 6th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D)

    2019/05 191st Committee on Innovative Interface Bonding Technology Japan Society for the Promotion of Science (JSPS) Novel Sputter Film Deposition to Fabricate Thick Films with Extremely Smooth Surface Suitable for Room Temperature Bonding

  8. AiMES 2018 ECS and SMEQ Joint International Meeting Best Paper Award

    2018/10 Electrochemical Society (ECS) Atomic Diffusion Bonding for Optical Devices with High Optical Density

  9. Magnetics and Optics Research International Symposium(MORIS 2018) Best Poster Award

    2018/01/10 University of New York, Japan Society for thePpromotion of Science Frequency dependence of microwave-assisted switching in CoCrPt granular perpendicular media

  10. Best Presentation Award Among Invited Papers, 230th Meeting of The Electrochemical Society (ECS), PRiME 2016, Semiconductor Wafer Bonding 14: Science, Technology and Applications

    2016/10/03 Electrochemical Society (ECS) High Output Power Deep Ultraviolet Light-Emitting Diodes with Hemispherical Lenses Fabricated Using Room-Temperature Bonding

  11. 第29回エレクトロニクス実装学会春季講演大会 優秀賞

    2015/07/07 一般社団法人 エレクトロニクス実装学会 Auキャップ付金属薄膜を用いたウエハの大気中室温接合Ⅱ(Cu, Al 薄膜)

  12. エレクトロニクス実装学会 MES2013 秋季大会 研究奨励賞

    2014/09/04 一般社団法人 エレクトロニクス実装学会

  13. 日本磁気学会 平成26年度優秀研究賞

    2014/09/03 公益社団法人 日本磁気学会

  14. Best Presentation Award, 2014 4th IEEE International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D)

    2014/07/16 IEEE CPMT Sociey Japan Chapter Room Temperature Bonding of Wafers in Air using Au-Ag Alloy Films

  15. マイクロ接合優秀研究賞(MJ賞)

    2014/07/04 一般社団法人 溶接学会 原子拡散接合法によるウエハの室温接合技術の現状と課題

  16. 田中貴金属工業株式会社「貴金属に関わる研究助成金」MMS賞

    2013/03/28 田中貴金属工業株式会社

  17. SRC情報ストレージ研究推進機構 論文賞2011

    2012/06/04 SRC情報ストレージ研究推進機構 Frequency and time dependent microwave assisted switching behaviors of Co/Pt nanodts Appl. Phys. Express, 5(2012)043001(1-3)

  18. Best Presentation Award, 2012 3rd IEEE International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D)

    2012/05/23 IEEE CPMT Japan Society Atomic Diffusion Bonding of Wafers in Air with Thin Au Films and Its Application to Optical Devices Fabrication

  19. SRC情報ストレージ研究推進機構 論文賞2010

    2011/05 SRC情報ストレージ研究推進機構 Microwave assisted magnetization switching in Co/Pt multilayer, J. Appl. Phys., Vol.109, 07B748(2011)

  20. 石田記念財団 平成22年度研究奨励賞

    2010/12 財団法人 石田記念財団 高密度ストレージデバイス用の高磁気異方性薄膜材料の開発

  21. 田中貴金属工業株式会社第11回「貴金属に関わる研究助成金」プラチナ賞(大賞)

    2010/01/19 田中貴金属工業株式会社 次世代ストレージ・メモリへの応用に向けたL11Co-Pt垂直磁化膜の高性能化

Show all ︎Show 5

Papers 324

  1. Atomic diffusion bonding of wafers with PDC-SiO2 underlayers using thin Y, Sc, and Zr films International-journal Peer-reviewed

    M. Uomoto, T. Shimatsu, T. Goto, T. Hanasaki, K. Bando, Y. Suzuki, T. Saito

    Japanese Journal of Applied Physics 64 (4) 048001-048001 2025/03/28

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/adc1d8  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract After quartz glass wafers with PDC-SiO2 films were bonded using thin Y, Sc, and Zr films, oxidation of these bonded films by oxygen dissociated from the PDC-SiO2 films was assessed. Optical and structural analyses revealed fully oxidized films formed at the bonded interface, achieved by application of post-bonding annealing at 300 °C using these 0.5 nm thick films. Particularly, Y films were oxidized easily. The surface free energy at the bonded interface γ was evaluated using a blade test, for convenience. The values, found to be higher than 2.6 J m−2 for as-bonded interfaces, were enhanced further by annealing.

  2. Blade testing in low-humidity air for bonded interfaces fabricated using atomic diffusion bonding with Zr and Al2O3 films International-journal Peer-reviewed

    H. Iemura, M. Uomoto, T. Shimatsu

    Japanese Journal of Applied Physics 64 (3) 038002-038002 2025/03/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/adb6b1  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract Blade tests of bonded interfaces created by atomic diffusion bonding of wafers using Zr and Al2O3 films were conducted in air (50% relative humidity RH), dry air (RH less than 2%) and Ar gas. We assessed the variation of the surface free energy γ at the bonded interfaces, as calculated for convenience from the debonding length. Although γ measured in air decreased remarkably from the initial value, γ measured in Ar and dry air maintained the same initial value for a while, suggesting that moisture content plays a main role in the γ decreasing caused by water stress corrosion.

  3. Loading Pressure Effects on the Bonded Interface Structure in Atomic Diffusion Bonding Using Thick Au Films International-journal Peer-reviewed

    K. Noguchi, M. Uomoto, T. Shimatsu

    2024 8th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 1-1 2024/10/30

    Publisher: IEEE

    DOI: 10.1109/ltb-3d64053.2024.10774151  

  4. Atomic Diffusion Bonding Using SiN Films International-journal Peer-reviewed

    A. Muraoka, K. Bando, Y. Suzuki, H. Makita, T. Saito, H. Fukunaga, M. Uomoto, T. Shimatsu

    2024 8th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 1-1 2024/10/30

    Publisher: IEEE

    DOI: 10.1109/ltb-3d64053.2024.10774121  

  5. Blade Test to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding with Amorphous Si and Al Films International-journal Peer-reviewed

    H. Iemura, M. Uomoto, T. Shimatsu

    2024 8th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 1-1 2024/10/30

    Publisher: IEEE

    DOI: 10.1109/ltb-3d64053.2024.10774118  

  6. Bonding Potential of Atomic Diffusion Bonding of Wafers Using Oxide Films International-journal Invited Peer-reviewed

    T. Shimatsu, M. Uomoto, A. Muraoka, K. Bando, Y. Suzuki, H. Makita, T. Saito

    2024 8th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 1-1 2024/10/30

    Publisher: IEEE

    DOI: 10.1109/ltb-3d64053.2024.10774147  

  7. Atomic Diffusion Bonding of Wafers with PDC-SiO2 Underlayers Using Thin Zr Films International-journal Peer-reviewed

    M. Uomoto, T. Shimatsu, T. Goto, T. Hanasaki, K. Bando, Y. Suzuki, T. Saito

    2024 8th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 1-1 2024/10/30

    Publisher: IEEE

    DOI: 10.1109/ltb-3d64053.2024.10774148  

  8. Optimization of Ag Thin Film Thickness with a Capping Layer for Ag-Ag Surface Activated Bonding International-journal Peer-reviewed

    Yuanhao Cai, Kai Takeuchi, Miyuki Uomoto, Takehito Shimatsu, Eiji Higurashi

    2024 International Conference on Electronics Packaging (ICEP) 117-118 2024/04/17

    Publisher: IEEE

    DOI: 10.23919/icep61562.2024.10535599  

  9. Atomic Diffusion Bonding of Wafers in Air Using Ag-3at%Cu Films Peer-reviewed

    Yuki Watabe, Miyuki Uomoto, Takehito Shimatsu

    Journal of The Japan Institute of Electronics Packaging 27 (1) 143-149 2024/01/01

    Publisher: Japan Institute of Electronics Packaging

    DOI: 10.5104/jiep.jiep-d-23-00072  

    ISSN: 1343-9677

    eISSN: 1884-121X

  10. Suppression of Surface Roughening of Ag Films by Capping Layer for Ag/Ag Surface Activated Bonding International-journal Peer-reviewed

    Yuanhao Cai, Kai Takeuchi, Miyuki Uomoto, Takehito Shimatsu, Eiji Higurashi

    2023 IEEE CPMT Symposium Japan (ICSJ) 2023/11/15

    Publisher: IEEE

    DOI: 10.1109/icsj59341.2023.10339608  

  11. Blade Test in Atmospheric-Pressure Ar Gas to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding International-journal Peer-reviewed

    Hikaru Iemura, Fuki Goto, Miyuki Uomoto, Takehito Shimatsu

    ECS Transactions 112 (3) 199-206 2023/09/29

    Publisher: The Electrochemical Society

    DOI: 10.1149/11203.0199ecst  

    ISSN: 1938-5862

    eISSN: 1938-6737

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    A blade test was applied in atmospheric-pressure Ar gas for wafers bonded using atomic diffusion bonding processing. We assessed the variation of the values of surface free energy at the bonded interface γ calculated, for convenience, from the debonding length. For interfaces bonded using thin Zr and Ti films, γ measured in Ar maintained the initial value γ0(Ar) in the initial region of observation time t and started decreasing as t increased further. Results indicate that γ0(Ar) corresponds to the value without water stress corrosion effects. The initial value of γ measured in air with a higher blade insertion-speed was almost equal to γ0(Ar). Result obtained for wafers bonded using Al2O3 films were almost identical to those obtained using metal films. However, γ for wafers bonded using ZrO2 films did not maintain their initial values. They decreased gradually as t increased, even in Ar, suggesting high water stress corrosion effects.

  12. Crystal Lattice Rearrangement Occurred at Au/Ag Bonded Interface in Atomic Diffusion Bonding in Vacuum International-journal Peer-reviewed

    Fuki Goto, Hikaru Iemura, Miyuki Uomoto, Takehito Shimatsu

    ECS Transactions 112 (3) 191-198 2023/09/29

    Publisher: The Electrochemical Society

    DOI: 10.1149/11203.0191ecst  

    ISSN: 1938-5862

    eISSN: 1938-6737

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    The crystal lattice rearrangement which occurs at the bonded interface of two films during atomic diffusion bonding processing in vacuum was examined using Au and Ag films. Results revealed that remarkable crystal lattice rearrangement occurs at the bonded interface of Au−Ag bonded films at room temperature. Grains formed continuously across the original interface over the entire thickness of the bonded films. Also, the (111) preferred grain orientation was effective at enhancing the crystal lattice rearrangement. The crystal lattice rearrangement did not accompany remarkable interdiffusion of Au and Ag at the interface, even though the crystal lattice formed continuously across the original interface. In addition to crystal lattice rearrangement, grain boundary diffusion plays an important role in bonding processes, enhancing the interdiffusion between Au and Ag films. Grain boundary diffusion is likely to be effective to fill the gaps in the boundaries of grains formed by crystal lattice rearrangement.

  13. Preferred Grain Orientation to Enhance Interdiffusion at Room Temperature in Atomic Diffusion Bonding: A Fundamental Study Using Ni and Cu Films International-journal Peer-reviewed

    Miyuki Uomoto, Shun Kikuchi, Fuki Goto, Takehito Shimatsu

    ECS Transactions 112 (3) 147-158 2023/09/29

    Publisher: The Electrochemical Society

    DOI: 10.1149/11203.0147ecst  

    ISSN: 1938-5862

    eISSN: 1938-6737

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    The interdiffusion and interface structure at the bonded interface of Cu and Ni films obtained using atomic diffusion bonding (ADB) processing was assessed in relation to films structures used for bonding. Improvement of the (111) preferred grain orientation in Ni and Cu films used for bonding enhanced the crystal lattice rearrangement at the bonded interface of Ni–Cu bonded films, leading to large interdiffusion. The representative interdiffusion length evaluated using magnetic characterization was 5.4 nm for a Ni(20 nm)–Cu(10 nm) bonded interface with Ti underlayers. Grain boundary diffusion partially contributed to the interdiffusion length independently of the (111) preferred grain orientation of films. These results indicate that ADB bonding performance enhancement can be achieved with a high degree of (111) preferred grain orientation and low surface roughness in ADB processing using metal films having an fcc crystal structure such as Al, Au, Ag, Cu, Ni, and Pt.

  14. Atomic Diffusion Bonding in Air Using Oxide Films International-journal Peer-reviewed

    Takehito Shimatsu, Miyuki Uomoto, Hitomi Fukunaga, Hiroyuki Makita, Yudai Suzuki, Yuhei Kozuka, Arina Muraoka, Takayuki Saito

    ECS Transactions 112 (3) 173-180 2023/09/29

    Publisher: The Electrochemical Society

    DOI: 10.1149/11203.0173ecst  

    ISSN: 1938-5862

    eISSN: 1938-6737

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    Atomic diffusion bonding (ADB) is a wafer bonding process using thin films. After ADB in air using oxide films was demonstrated, the resultant bonding performance was compared to that obtained ADB in vacuum with the oxide films. Great bonding strength can be obtained at room temperature using ADB in vacuum, whereas ADB in air required post-bonding annealing at temperature above 150 °C to achieve surface free energy at the bonded interface greater than 1 J/m2. However, ADB in air is a convenient process compared to that in vacuum. For ADB in air using oxide films, we demonstrated that very thin metal films oxidized in air can also be used as oxide films. Particularly, by using amorphous Si films, bonded wafers with a bonded interface consisting of SiO2 amorphous layer can be realized with post-bonding annealing at 150 °C.

  15. Effect of film thickness on microwave assisted switching behavior International-journal Peer-reviewed

    Nobuaki Kikuchi, Katsunari Sato, Masatoshi Hatayama, Takehito Shimatsu, Satoshi Okamoto

    2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) 2023/05

    Publisher: IEEE

    DOI: 10.1109/intermagshortpapers58606.2023.10228446  

  16. Microwave-assisted switching in granular media with continuous magnetic overlayers for interaction control Peer-reviewed

    Nobuaki Kikuchi, Katsunari Sato, Takehito Shimatsu, Satoshi Okamoto

    Japanese Journal of Applied Physics 62 (SB) SB1015-1-SB1015-6 2023/03/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/ac9910  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract Optimizing switching behavior under a microwave field is a key issue for microwave-assisted magnetic recording. We study the effect of inter-grain exchange coupling induced by a continuous magnetic layer on microwave-assisted switching of CoCrPt-SiO2 granular media. The microwave assistance effect is improved in the low-frequency region by introducing the inter-grain exchange coupling, but the coupling reduces the critical frequency. The maximum assistance effect is almost independent of the film structure since the dual effect cancels each other. Micromagnetic simulations also show similar results on exchange coupling between grains. These results indicate that the inter-grain exchange coupling can be used to optimize the critical frequency of the media in practical applications.

  17. Thermal activation on microwave-assisted magnetization switching in Co/Pt nanodot arrays International-journal Peer-reviewed

    Satoshi Mizutani, Nobuaki Kikuchi, Masatoshi Hatayama, Takehito Shimatsu, Satoshi Okamoto

    Japanese Journal of Applied Physics 62 (SB) SB1012-1-SB1012-5 2023/03/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/ac9533  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract The magnetization switching field is efficiently reduced by exciting precession with a microwave field of GHz frequency. Analytical calculations based on the Landau–Lifshitz–Gilbert equation have revealed that the effect of the thermal activation process plays an important role in magnetization switching behavior under a microwave field. In this study, we experimentally investigated the microwave-assisted magnetization switching (MAS) behavior of Co/Pt nanodot arrays under various microwave field conditions. Experimental results were compared with the calculated effective energy barrier height of MAS. Consequently, all the experimental MAS behaviors can be explained by the effect of thermal activation, but quantitative discussion will require accurate experimental studies.

  18. ATOMIC DIFFUSION BONDING USING ALN FILMS WITH HIGH ELECTRICAL RESISTIVITY Peer-reviewed

    A. Muraoka, H. Makita, T. Saitoh, M. Uomoto, T. Shimatsu

    Proceedings of WaferBond’22 Conference on Wafer Bonding for Microsystems, 3D- and Wafer Level Integration 23-24 2022/10

  19. ATOMIC DIFFUSION BONDING OF WAFERS USING VARIOUS OXIDE FILMS Invited

    T. Shimatsu, M. Uomoto, T. Saito, T. Moriwaki, N. Kato

    Proceedings of WaferBond’22 Conference on Wafer Bonding for Microsystems, 3D- and Wafer Level Integration 19-22 2022/10

  20. Crystal structure deformation and phase transition of AlScN thin films in whole Sc concentration range International-journal Peer-reviewed

    Shiro Satoh, Koichi Ohtaka, Takehito Shimatsu, Shuji Tanaka

    Journal of Applied Physics 132 (2) 025103-025103 2022/07/14

    Publisher: AIP Publishing

    DOI: 10.1063/5.0087505  

    ISSN: 0021-8979

    eISSN: 1089-7550

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    This article reports lattice deformation and phase transition of AlScN thin films in the whole composition. AlScN films were deposited on Pt/Ta/SiO2/Si substrates by direct current magnetron reactive sputtering with Al and Sc targets. At Sc concentration up to 30%, AlScN has a wurtzite structure with piezoelectricity. Transition from a wurtzite phase to a two-phase mixture happens between 30% and 35% Sc concentration, and transition from a two-phase mixture to a cubic phase happens between 38% and 43% Sc concentration. The wurtzite structure gradually deforms with the decrease in lattice constant c from 16% to 35% Sc concentration. Lattice constant c at 38% Sc in the two-phase mixture region is larger than that of 35% Sc concentration. These increases mean that distortion of c axis for the wurtzite structure over 35% Sc concentration in the two-phase mixture region is considered to be released and/or eased due to the appearance of the cubic phase, and that Sc concentration of the wurtzite phase to be smaller and that of the cubic phase larger than the film composition measured by energy-dispersive x-ray spectroscopy and Rutherford backscattering spectroscopy. At higher Sc concentration up to 43%, the remained wurtzite phases are replaced by non-piezoelectric cubic phases, and the cubic structure approaches the rock-salt structure of ScN with a further increase in Sc concentration.

  21. Atomic diffusion bonding with oxide underlayers using Al and amorphous Si films for high optical density applications International-journal Peer-reviewed

    Gen Yonezawa, Miyuki Uomoto, Takehito Shimatsu

    Japanese Journal of Applied Physics 61 (SF) SF1011-SF1011 2022/06/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/ac5870  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract Atomic diffusion bonding with oxide underlayers using Al and a-Si films was examined to create a bonded interface with Al2O3 and Si-oxides having large band gaps for high optical density applications. Surface free energy of the bonded interface greater than 2 J m−2 and 100% light transmittance were achieved after annealing at 300 °C in the range of film thicknesses δ on both sides from 0.3 to 0.5 nm using Al films and with δ of around 0.5 nm using a-Si films. Structural analyses revealed that the bonded interface consists of Al2O3 and Si-oxides with oxygen dissociated from oxide underlayers.

  22. Atomic diffusion bonding in air using Ag films International-journal Peer-reviewed

    Yuki Watabe, Fuki Goto, Miyuki Uomoto, Takehito Shimatsu

    Japanese Journal of Applied Physics 61 (SF) SF1003-1-SF1003-3 2022/06/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/ac5760  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract Atomic diffusion bonding (ADB) of wafers at room temperature in air was studied using Ag films. Using an ultra-high vacuum magnetron sputtering system, Ag (20 nm) films with Ti (5 nm) underlayers were deposited. The propagation speed of crystal lattice rearrangement in the bonding process decreased with an increased exposure time of film surfaces to air (texp). Propagation did not occur at texp of 500 s. The cohesion of Ag film surfaces by film surface exposure to air and reduction of the Ag film surface energy by Ag oxide or sulfide formation probably cause ADB performance degradation.

  23. Bonding performance in atomic diffusion bonding of wafers using amorphous Si thin films with smooth surface International-journal Peer-reviewed

    T. Amino, M. Uomoto, T. Shimatsu

    Japanese Journal of Applied Physics 61 (SF) SF1002-1-SF1002-3 2022/06/01

    Publisher: IOP Publishing

    DOI: 10.35848/1347-4065/ac5871  

    ISSN: 0021-4922

    eISSN: 1347-4065

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    Abstract Amorphous Si films with a low surface roughness of 0.13 nm were used to examine the bonding performance of atomic diffusion bonding of quartz glass wafers at room temperature in vacuum. The high bonding strength was achieved for films with thickness δ of 2–50 nm: the blade could not be inserted between the bonded wafers. Using a vacuum chamber with a base pressure of 1 × 10–6 Pa, the great bonding strength was maintained even with waiting time in vacuum of as long as 3.6 × 103 s from film deposition to bonding. The excellent bonding performance was almost equal to that achieved using Ti films.

  24. Thermal activation in microwave-assisted magnetization switching and its effect on the switching behavior of granular media International-journal Peer-reviewed

    Nobuaki Kikuchi, Katsunari Sato, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu, Hirofumi Suto

    Physical Review B 105 (5) 054430-1-054430-11 2022/02/25

    Publisher: American Physical Society (APS)

    DOI: 10.1103/physrevb.105.054430  

    ISSN: 2469-9950

    eISSN: 2469-9969

  25. Low Thermal Resistance, Low Inductance Power Module with WBG Device Peer-reviewed

    Akira HIRAO, Motohito HORI, Yoshinari IKEDA, Takehito SHIMATSU

    Proceedings of the 28th Symposium on Microjoining and Assembly Technology in Electronics 28 149-152 2022/02

  26. Direct Bonding of Semiconductor Chip through Elastic Resin Film Peer-reviewed

    Jin Li, Hiroshi Kikuchi, Norimasa Nagata, Takehito Shimatsu, Miyuki Uomoto

    Journal of The Japan Institute of Electronics Packaging 25 (1) 133-140 2022/01/01

    Publisher: Japan Institute of Electronics Packaging

    DOI: 10.5104/jiep.jiep-d-21-00070  

    ISSN: 1343-9677

    eISSN: 1884-121X

  27. Atomic Diffusion Bonding of Wafers with Oxide Underlayers using Thin Hf Films for Optical Applications Peer-reviewed

    G. Yonezawa, M. Uomoto, T. Shimatsu

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 52-52 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598448  

  28. Atomic Diffusion Bonding using Y2O3 and ZrO2 films Peer-reviewed

    T. Shimatsu, H. Yoshida, M. Uomoto, T. Saito, T. Moriwaki, N. Kato, Y. Miyamoto, K. Miyamoto

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 51-51 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598449  

  29. Atomic Diffusion Bonding using AlN films Peer-reviewed

    M. Uomoto, H. Yoshida, T. Shimatsu, T. Saito, T. Moriwaki, N. Kato, Y. Miyamoto, K. Miyamoto

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 45-45 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598193  

  30. Surface Contamination Effects on Bonding Performance in Atomic Diffusion Bonding of Wafers using Amorphous Si Thin Films Peer-reviewed

    T. Amino, M. Uomoto, T. Shimatsu

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 40-40 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598433  

  31. Preliminary Study of Atomic Diffusion Bonding in Air using Ag films Peer-reviewed

    Y. Watabe, F. Goto, M. Uomoto, T. Shimatsu

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 39-39 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598421  

  32. Sputtering Technique to Fabricate Smooth Surface Oxide Film for Room Temperature Bonding Peer-reviewed

    T. Saito, T. Hanasaki, T. Moriwaki, T. Goto, A. Takeda, A. Miura, M. Uomoto, T. Shimatsu

    2021 7th International Workshop on Low Temperature Bonding for 3D Integration (LTB-3D) 5-5 2021/10/05

    Publisher: IEEE

    DOI: 10.1109/ltb-3d53950.2021.9598432  

  33. Bonding Performance and Interface Contamination in Atomic Diffusion Bonding of Wafers Using Ti Thin Films Peer-reviewed

    T. Amino, M. Uomoto, T. Shimatsu

    ECS Journal of Solid State Science and Technology 10 (5) 054008-054008 2021/05/25

    Publisher: The Electrochemical Society

    DOI: 10.1149/2162-8777/ac0113  

    ISSN: 2162-8769

    eISSN: 2162-8777

  34. First Demonstration of a High‐Speed and High‐Power‐Tolerance InGaAs/Si Photodiode Fabricated by Atomic Diffusion Bonding Peer-reviewed

    Yuki Yamada, Masahiro Nada, Miyuki Uomoto, Takehito Shimatsu, Fumito Nakajima, Hideaki Matsuzaki

    Physica Status Solidi (A) Applications and Materials Science 218 (3) 2000395-1-2000395-5 2021/02

    Publisher: Wiley

    DOI: 10.1002/pssa.202000395  

    ISSN: 1862-6300

    eISSN: 1862-6319

  35. SiC/Ni中間層を用いたGaN基板の常温接合

    竹内 魁, 須賀 唯知, Mu Fengwen, 魚本 幸, 島津 武仁

    エレクトロニクス実装学術講演大会講演論文集 35 17A3-04 2021

    Publisher: 一般社団法人エレクトロニクス実装学会

    DOI: 10.11486/ejisso.35.0_17a3-04  

  36. Atomic diffusion bonding of Si wafers using thin Nb films Peer-reviewed

    Miyuki Uomoto, Takehito Shimatsu

    Japanese Journal of Applied Physicss 59 (SB) SBBC04-1-SBBC04-3 2020/02

    DOI: 10.7567/1347-4065/ab4b1c  

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    published online November 27, 2019

  37. Atomic diffusion bonding using oxide underlayers for optical applications Peer-reviewed

    G. Yonezawa, Y. Takahashi, Y. Sato, S. Abe, M. Uomoto, T. Shimatsu

    Japanese Journal of Applied Physicss 59 (SB) SBBC03-1-SBBC03-5 2020/02

    DOI: 10.7567/1347-4065/ab4b1e  

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    published online November 27, 2019

  38. Sputter film deposition to fabricate thick oxide films with extremely smooth surface suitable for room-temperature bonding Peer-reviewed

    T. Saito, H. Makita, T. Moriwaki, Y. Suzuki, N. Kato, S. Wakayanagi, A. Miura, M. Uomoto, T. Shimatsu

    Japanese Journal of Applied Physicss 59 (SB) SBBC02-1-SBBC02-3 2020/02

    DOI: 10.7567/1347-4065/ab4c85  

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    published online November 27, 2019

  39. Rearrangement of crystal lattice at a Ag/Ag and Au/Au bonded interface in atomic diffusion bonding Peer-reviewed

    Shigenobu Matsuda, Miyuki Uomoto, Ayaka Miura, Takehito Shimatsu

    Japanese Journal of Applied Physicss 59 (SB) SBBC01-1-SBBC01-3 2020/02

    DOI: 10.7567/1347-4065/ab4f27  

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    published online November 27, 2019

  40. Minority-electron transport through atomic-diffusion-bonded InGaAs/a-Ge/InGaAs structure studied by photodiode characterization Peer-reviewed

    Yuki Yamada, Masahiro Nada, Miyuki Uomoto, Takehito Shimatsu, Fumito Nakajima, Takuya Hoshi, Hideaki Matsuzaki

    Japanese Journal of Applied Physicss 59 (1) 016501-1-016501-5 2020/01

    DOI: 10.7567/1347-4065/ab5c65  

  41. Fabrication of High Power Deep Ultraviolet Light-Emitting Diodes with Glass Lenses Using Atomic Diffusion Bonding Peer-reviewed

    M. Ichikawa, T. Kemmochi, T. Mukai, M. Uomoto, T. Shimatsu

    ECS Journal of Solid State Science and Technology 9 (1) 015004-1-015004-8 2020/01

    DOI: 10.1149/2.0092001JSS  

  42. Microwave-assisted switching in CoCrPt granular medium under continuous microwave fields Peer-reviewed

    Nobuaki Kikuchi, Katsunari Sato, Shun Kikuchi, Satoshi Okamoto, Takehito Shimatsu, Osamu Kitakami, Hitoshi Osawa, Motohiro Suzuki

    Journal of Applied Physics 126 (8) 083908(1-7) 2019/08

    DOI: 10.1063/1.5111576  

    ISSN: 0021-8979

    eISSN: 1089-7550

  43. Novel Gratings for Astronomical Observations Fabricated by Latest Technologies Peer-reviewed

    Noboru Ebizuka, Takayuki Okamoto, Minoru Sasaki, Ichi Tanaka, Miyuki Uomoto, Takehito Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 77 2019/06

    DOI: 10.23919/LTB-3D.2019.8735117  

  44. Rearrangement of Crystal Lattice Occurred at Ag/Ag Bonded Interface in Atomic Diffusion Bonding Peer-reviewed

    S. Matsuda, M. Uomoto, A. Miura, T. Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 67 2019/06

    DOI: 10.23919/LTB-3D.2019.8735204  

  45. Atomic Diffusion Bonding of Wafers using a-Ge Films with Extremely Low Electrical Conductivity Peer-reviewed

    A. Muraoka, M. Uomoto, M. Abe, T. Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 66 2019/06

    DOI: 10.23919/LTB-3D.2019.8735352  

  46. Atomic Diffusion Bonding of Wafers Using Thin Nb Films Peer-reviewed

    M. Uomoto, T. Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 65 2019/06

    DOI: 10.23919/LTB-3D.2019.8735105  

  47. Novel Sputter Film Deposition to Fabricate Thick Films with Extremely Smooth Surface Suitable for Room Temperature Bonding Peer-reviewed

    T. Saito, H. Makita, T. Moriwaki, Y. Suzuki, N. Kato, S. Wakayanagi, A. Miura, M. Uomoto, T. Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 64 2019/06

    DOI: 10.23919/LTB-3D.2019.8735262  

  48. Oxidation of Bonded Thin Ti Films Using Oxide Underlayers in Atomic Diffusion Bonding Process for Optical Applications Peer-reviewed

    G. Yonezawa, Y. Sato, S. Abe, M. Uomoto, T. Shimatsu

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019, IEEE 63 2019/06

    DOI: 10.23919/LTB-3D.2019.8735120  

  49. Temporary SiC-SiC wafer bonding compatible with high temperature annealing Peer-reviewed

    Fengwen Mu, Tadatomo Suga, Miyuki Uomoto, Takehito Shimatsu

    Proceedings - Electronic Components and Technology Conference 2019-May 989-994 2019/05

    DOI: 10.1109/ECTC.2019.00155  

    ISSN: 0569-5503

  50. Temporary SiC-SiC Wafer Bonding Compatible with High Temperature Annealing Peer-reviewed

    Fengwen Mu, Tadatomo Suga, Miyuki Uomoto, Takehito Shimatsu

    Proceedings of 2019 IEEE 69th Electronic Components and Technology Conference (ECTC) 989-994 2019/05

    DOI: 10.1109/ECTC.2019.00155  

    ISSN: 2377-5726

  51. SiC-SiC temporary bonding compatible with rapid thermal annealing at 1000 °c Peer-reviewed

    Fengwen Mu, Tadatomo Suga, Miyuki Uomoto, Takehito Shimatsu, Kenichi Iguchi, Haruo Nakazawa

    Proceedings of 2019 6th International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2019 4 2019/05

    DOI: 10.23919/LTB-3D.2019.8735291  

  52. De-bondable SiC–SiC wafer bonding via an intermediate Ni nano-film Peer-reviewed

    Fengwen Mu, Miyuki Uomoto, Takehito Shimatsu, Yinghui Wang, Kenichi Iguchi, Haruo Nakazawa, Yoshikazu Takahashi, Eiji Higurashi, Tadatomo Suga

    Applied Surface Science 465 591-595 2019/01/28

    DOI: 10.1016/j.apsusc.2018.09.050  

    ISSN: 0169-4332

  53. Near-Zero TCF of HAL SAW Resonator with LiTaO3-on-Quartz Structure Peer-reviewed

    Michio Kadota, Yoshimi Yunoki, Takehito Shimatsu, Miyuki Uomot, Shuji Tanaka

    1-4 2019/01

    ISSN: 2327-1949

  54. Suprious-Free, Near-Zero-TCF Hetero Acoustic Layer (HAL)SAW Resonators Using LiTaO3Thin Plate on Quartz Peer-reviewed

    Michio Kadota, Yoshimi Ishii Yunoki, Takehito Shimatsu, Miyuki Uomoto, Shuji Tanaka

    Proceedings of 2018 IEEE International Ultrasonics Symposium (IUS) 1-9 2018/12

    DOI: 10.1109/ULTSYM.2018.8580111  

    ISSN: 1948-5727

  55. Atomic Diffusion Bonding for Optical Devices with High Optical Density Peer-reviewed

    G. Yonezawa, Y. Takahashi, Y. Sato, S. Abe, M. Uomoto, T. Shimatsu

    ECS Transactions 86 (5) 233-245 2018/09

    DOI: 10.1149/08605.0233ecst  

  56. Room Temperature Bonding of Wafers using Si and Ge Films with Extremely Low Electrical Conductivity Peer-reviewed

    M. Uomoto, A. Muraoka, T. Shimatsu

    ECS Transactions 86 (5) 199-204 2018/09

    DOI: 10.1149/08605.0199ecst  

  57. Frequency dependence of microwave-assisted switching in CoCrPt granular perpendicular media Peer-reviewed

    Nobuaki Kikuchi, Kyohei Shimada, Takehito Shimatsu, Satoshi Okamoto, Osamu Kitakami

    JAPANESE JOURNAL OF APPLIED PHYSICS 57 (9) 09TE02(1-4) 2018/08

    DOI: 10.7567/JJAP.57.09TE02  

    ISSN: 0021-4922

    eISSN: 1347-4065

  58. MICROWAVE ASSISTED SWITCHING BEHAVIOR OF COCRPT BASED GRANULAR MEDIA

    Nobuaki KIKUCHI, Kyohei SHIMADA, Shun KIKUCHI, Katsunari SATO, Satoshi OKAMOTO, Osamu KITAKAMI, Takehito SHIMATSU

    Digest of the 29th Magnetic Recording Conference 2018(TMRC2018) 41-42 2018/08

  59. Layer-selective microwave-assisted magnetization switching in a dot of double antiferromagnetically coupled (AFC) layers Peer-reviewed

    Yuming Lu, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    Applied Physics Letters 112 (16) 162404(1-4) 2018/04/16

    Publisher: American Institute of Physics Inc.

    DOI: 10.1063/1.5027127  

    ISSN: 0003-6951

  60. CoCrPt-TiO2グラニュラー薄膜におけるマイクロ波アシスト磁化反転挙動

    菊池 伸明, 島田 恭平, 島津 武仁, 岡本 聡†, 北上 修

    電子情報通信学会技術研究報告 MR 117 (501) 45-49 2018/03

    Publisher: 電気学会

  61. Novel torque magnetometry for uniaxial anisotropy constants of thin films and its application to FePt granular thin films Peer-reviewed

    Takuya Ono, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    Applied Physics Express 11 (3) 033002(1-3) 2018/03/01

    Publisher: Japan Society of Applied Physics

    DOI: 10.7567/APEX.11.033002  

    ISSN: 1882-0786 1882-0778

  62. Interface structure of InGaAs wafers bonded using thin amorphous Ge films in vacuum Peer-reviewed

    Miyuki Uomoto, Yuki Yamada, Takuya Hoshi, Masahiro Nada, Takehito Shimatsu

    Japanese Journal of Applied Physics 57 (2) 02BA03(1-3) 2018/02/01

    Publisher: Japan Society of Applied Physics

    DOI: 10.7567/JJAP.57.02BA03  

    ISSN: 1347-4065 0021-4922

  63. 双極子結合した積層磁性ドットによるマイクロ波アシスト実験

    金原大樹, 岡本聡, 菊池伸明, 北上修, 島津武仁

    電気学会研究会資料,MAGZ43 43 (234) 21-25 2017/11

  64. Transmission Gratings and Immersion Gratings for Instruments of Subaru Telescope and TMT Peer-reviewed

    N. Ebizuka, T. Okamoto, M. Takeda, T. Hosobata, Y. Yamagata, M. Sasaki, M. Uomoto, T. Shimatsu, S. Sato, N. Hashimoto, I. Tanaka, T. Hattori, S. Ozaki, W. Aoki

    Proceedings of International Conference on Leading Edge Manufacturing in 21st century : LEM21 2017/09

  65. Tuning Magnetic Anisotropy and Curie Temperature of L10-FePt Granular films Invited

    T. Shimatsu, T. Ono, T. Moriya, H. Nakata, K. Komiyama, S. Uchida, H. Oyama, H. Kikuchi, H. Kataoka, K. Sato, A. Furuta, T. Yoshizawa, M. Hatayama, K. Tsumura, N. Kikuchi, O. Kitakami

    Digest of the 28th Magnetic Recording Conference 2017(TMRC2017) 2017/08

    More details Close

    Tsukuba, August(2017) A-1

  66. Magnetization switching of a dipolar coupled layered magnetic nanodot under the assistance of microwave

    Daiki KANAHARA, Satoshi OKAMOTO, Nobuaki KIKUCHI, Osamu KITAKAMI, Takehito SHIMATSU

    IEICE Technical Report 117 (80) 53-58 2017/06/01

    Publisher:

    ISSN: 1342-6893

  67. Influence of intergrain interactions and thermal agitation on microwave-assisted magnetization switching behavior of granular magnetic film Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS EXPRESS 10 (2) 023004(1-4) 2017/02

    DOI: 10.7567/APEX.10.023004  

    ISSN: 1882-0778

    eISSN: 1882-0786

  68. Diffraction Gratings for the Latest Visible and Infrared Astronomical Observations Peer-reviewed

    Noboru EBIZUKA, Takayuki OKAMOTO, Miyuki UOMOTO, Takehito SHIMATSU, Minoru SASAKI, Andrea BIANCO, Chris PACKHAM, Wako AOKI

    日本赤外線学会誌 26 (2) 32-39 2017/02

    Publisher:

    ISSN: 0916-7900

  69. Lasing and thermal characteristics of Yb:YAG/YAG composite with atomic diffusion bonding Peer-reviewed

    Siva Sankar Nagisetty, Patricie Severova, Taisuke Miura, Martin Smrz, Hitoe Kon, Miyuki Uomoto, Takehito Shimatsu, Masato Kawasaki, Takeshi Higashiguchi, Akira Endo, Tomas Mocek

    LASER PHYSICS LETTERS 14 (1) 015001(6pp) 2017/01

    DOI: 10.1088/1612-202X/14/1/015001  

    ISSN: 1612-2011

    eISSN: 1612-202X

  70. Magnetic characteristics and nanostructures of FePt granular films with GeO2 segregant Peer-reviewed

    Takuya Ono, Tomohiro Moriya, Masatoshi Hatayama, Kaoru Tsumura, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS LETTERS 110 (2) 022402(1-4) 2017/01

    DOI: 10.1063/1.4973473  

    ISSN: 0003-6951

    eISSN: 1077-3118

  71. Enhancement of Light Transmittance for Wafers Bonded with Thin Al films using Atomic Diffusion Bonding and Subsequent Laser Irradiation Peer-reviewed

    M. Ichikawa, N. Eboshi, T. Kemmochi, M. Sano, T. Mukai, M. Uomoto, T. Shimatsu

    2017 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 6-6 2017

    DOI: 10.23919/LTB-3D.2017.7947402  

  72. Shear Strength of Room-Temperature-Bonded Sapphire and Metal Substrates using Au Films Peer-reviewed

    H. Kon, M. Uomoto, N. Nakajima, T. Nakaya, T. Shimatsu

    2017 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 48-48 2017

    DOI: 10.23919/LTB-3D.2017.7947444  

  73. Demonstration of laser oscillation of an Yb-doped Y2O3 composite disk by use of atomic diffusion bonding in room temperature Peer-reviewed

    Takeshi Higashiguchi, Syun Yamauchi, Yusuke Fujii, Natsumi Shinozaki, Takuto Ogura, Miyuki Uomoto, Takehito Shimatsu, Taisuke Miura, Tomas Mocek

    2017 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 49-49 2017

    DOI: 10.23919/LTB-3D.2017.7947445  

  74. Room Temperature Bonding of InGaAs Wafers using Thin Ge Films Peer-reviewed

    M. Uomoto, Y. Yamada, T. Hoshi, M. Nada, T. Shimatsu

    2017 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 50-50 2017

    DOI: 10.23919/LTB-3D.2017.7947446  

  75. Novel gratings for next-generation instruments of astronomical observations Peer-reviewed

    N. Ebizuka, T. Okamoto, M. Takeda, T. Hosobata, Y. Yamagata, M. Sasaki, M. Uomoto, T. Shimatsu, S. Sato, N. Hashimoto, I. Tanaka, T. Hattori, S. Ozaki, W. Aoki

    HOLOGRAPHY: ADVANCES AND MODERN TRENDS V 10233 (10233) M1-M8 2017

    DOI: 10.1117/12.2264892  

    ISSN: 0277-786X

  76. Addition of Ru to L1(0)-FePt thin film to lower Curie temperature Peer-reviewed

    Takuya Ono, Hitoshi Nakata, Tomohiro Moriya, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS EXPRESS 9 (12) 1230002(1-3) 2016/12

    DOI: 10.7567/APEX.9.123002  

    ISSN: 1882-0778

    eISSN: 1882-0786

  77. Radio Frequency Field Dependence of Microwave-Assisted Switching Behaviors of Co/Pt Nanodots Peer-reviewed

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    ELECTRONICS AND COMMUNICATIONS IN JAPAN 99 (8) 79-85 2016/08

    DOI: 10.1002/ecj.11842  

    ISSN: 1942-9533

    eISSN: 1942-9541

  78. High-output-power deep ultraviolet light-emitting diode assembly using direct bonding Peer-reviewed

    Masatsugu Ichikawa, Akira Fujioka, Takao Kosugi, Shinya Endo, Harunobu Sagawa, Hiroto Tamaki, Takashi Mukai, Miyuki Uomoto, Takehito Shimatsu

    APPLIED PHYSICS EXPRESS 9 (7) 072101(1-4) 2016/07

    DOI: 10.7567/APEX.9.072101  

    ISSN: 1882-0778

    eISSN: 1882-0786

  79. Microwave-Assistance Effect on Magnetization Switching in Antiferromagnetically Coupled CoCrPt Granular Media Peer-reviewed

    Y. Nakayama, Y. Kusanagi, T. Shimatsu, N. Kikuchi, S. Okamoto, O. Kitakami

    IEEE TRANSACTIONS ON MAGNETICS 52 (7) 3201203(1-3) 2016/07

    DOI: 10.1109/TMAG.2015.2507188  

    ISSN: 0018-9464

    eISSN: 1941-0069

  80. Magnetic Anisotropy and Crystal Domain Variant in L1(0)-FePt Polycrystalline Films Peer-reviewed

    A. Hotta, T. Ono, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    IEEE TRANSACTIONS ON MAGNETICS 52 (7) 3200803(1-3) 2016/07

    DOI: 10.1109/TMAG.2016.2522504  

    ISSN: 0018-9464

    eISSN: 1941-0069

  81. Experimental investigation of off-stoichiometry and 3d transition metal (Mn, Ni, Cu)-substitution in single-crystalline FePt thin films Peer-reviewed

    Takuya Ono, Hitoshi Nakata, Tomohiro Moriya, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    AIP ADVANCES 6 (5) 056011(1-5) 2016/05

    DOI: 10.1063/1.4943535  

    ISSN: 2158-3226

  82. Novel diffraction gratings for next generation Spectrographs with high spectral dispersion Peer-reviewed

    N. Ebizuka, T. Okamoto, T. Hosobata, Y. Yamagata, M. Sasaki, M. Uomoto, T. Shimatsu, S. Sato, N. Hashimoto, I. Tanaka, T. Hattori, S. Ozaki, W. Aoki

    ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION II 9912 (9912) 2Z 2016

    DOI: 10.1117/12.2231949  

    ISSN: 0277-786X

    eISSN: 1996-756X

  83. Invited: High Output Power Deep Ultraviolet Light-Emitting Diodes with Hemispherical Lenses Fabricated Using Room-Temperature Bonding Invited Peer-reviewed

    M. Ichikawa, S. Endo, H. Sagawa, A. Fujioka, T. Kosugi, T. Mukai, M. Uomoto, T. Shimatsu

    SEMICONDUCTOR WAFER BONDING: SCIENCE, TECHNOLOGY AND APPLICATIONS 14 75 (9) 53-65 2016

    DOI: 10.1149/07509.0053ecst  

    ISSN: 1938-5862

  84. Necessary Thickness of Au Capping Layers for Room Temperature Bonding of Wafers in Air using Thin Metal Films with Au Capping Layers Peer-reviewed

    M. Uomoto, T. Shimatsu

    SEMICONDUCTOR WAFER BONDING: SCIENCE, TECHNOLOGY AND APPLICATIONS 14 75 (9) 67-76 2016

    DOI: 10.1149/07509.0067ecst  

    ISSN: 1938-5862

  85. Microwave assisted magnetic recording technologies and related physics Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

    JOURNAL OF PHYSICS D-APPLIED PHYSICS 48 (35) 353001 (18pp) 2015/09

    DOI: 10.1088/0022-3727/48/35/353001  

    ISSN: 0022-3727

    eISSN: 1361-6463

  86. Radio frequency field dependence of microwave assisted switching behaviors of Co/Pt Nanodots Peer-reviewed

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    IEEJ Transactions on Fundamentals and Materials 135 (4) 229-234 2015/04/01

    Publisher: Institute of Electrical Engineers of Japan

    DOI: 10.1541/ieejfms.135.229  

    ISSN: 1347-5533 0385-4205

  87. Quantized spin waves in single Co/Pt dots detected by anomalous Hall effect based ferromagnetic resonance Peer-reviewed

    N. Kikuchi, M. Furuta, S. Okamoto, O. Kitakami, T. Shimatsu

    APPLIED PHYSICS LETTERS 105 (24) 242405(1-4) 2014/12

    DOI: 10.1063/1.4904225  

    ISSN: 0003-6951

    eISSN: 1077-3118

  88. 原子拡散接合法による室温接合技術 Invited

    島津 武仁, 魚本 幸, 今 一恵

    溶接学会 第107回マイクロ接合研究委員会資料 41-48 2014/07/04

  89. Granular nanostructures and magnetic characteristics of FePt-TiO2/FePt-C stacked granular films Peer-reviewed

    Takuya Ono, Tomohiro Moriya, Masatoshi Hatayama, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    JOURNAL OF APPLIED PHYSICS 115 (17) 17B709(1-3) 2014/05

    DOI: 10.1063/1.4861684  

    ISSN: 0021-8979

    eISSN: 1089-7550

  90. Magnetic anisotropy and order structure of L1(0)-FePt(001) single-crystal films grown epitaxially on (001) planes of MgO, SrTiO3, and MgAl2O4 substrates Peer-reviewed

    A. Hotta, T. Ono, M. Hatayama, K. Tsumura, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    JOURNAL OF APPLIED PHYSICS 115 (17) 17B712 (1-3) 2014/05

    DOI: 10.1063/1.4862840  

    ISSN: 0021-8979

    eISSN: 1089-7550

  91. Size dependence of magnetization switching and its dispersion of Co/Pt nanodots under the assistance of radio frequency fields Peer-reviewed

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    JOURNAL OF APPLIED PHYSICS 115 (13) 133914(1-8) 2014/04

    DOI: 10.1063/1.4870451  

    ISSN: 0021-8979

    eISSN: 1089-7550

  92. Theory and Experiment of Microwave-Assisted Magnetization Switching in Perpendicular Magnetic Nanodots Invited Peer-reviewed

    Satoshi Okamoto, Masaki Furuta, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    IEEE TRANSACTIONS ON MAGNETICS 50 (3) 3200906(1-6) 2014/03

    DOI: 10.1109/TMAG.2013.2281400  

    ISSN: 0018-9464

    eISSN: 1941-0069

  93. Quasi-ballistic magnetization switching in Co/Pt dots with perpendicular magnetization Peer-reviewed

    N. Kikuchi, Y. Suyama, S. Okamoto, O. Kitakami, T. Shimatsu

    APPLIED PHYSICS LETTERS 104 (11) 112409(1-4) 2014/03

    DOI: 10.1063/1.4869150  

    ISSN: 0003-6951

    eISSN: 1077-3118

  94. Room Temperature Bonding of Sapphire with Sapphire or Metal Substrates in Air using Au Films Peer-reviewed

    M. Ishii, H. Kon, M. Uomoto, T. Nakaya, T. Shimatsu

    2014 4TH IEEE INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 27-27 2014

    DOI: 10.1109/LTB-3D.2014.6886166  

  95. Room Temperature Bonding of Wafers in Air using Au-Ag Alloy Films Peer-reviewed

    H. Kon, M. Uomoto, T. Shimatsu

    2014 4TH IEEE INTERNATIONAL WORKSHOP ON LOW TEMPERATURE BONDING FOR 3D INTEGRATION (LTB-3D) 28-28 2014

    DOI: 10.1109/LTB-3D.2014.6886167  

  96. Room temperature bonding of wafers using au films with various holding times in air Peer-reviewed

    Hitoe Kon, Miyuki Uomoto, Takehito Shimatsu

    Journal of Japan Institute of Electronics Packaging 17 (5) 431-435 2014

    Publisher: Japan Institute of Electronics Packaging

    DOI: 10.5104/jiep.17.431  

    ISSN: 1884-121X 1343-9677

  97. Invited: Room Temperature Bonding Using Thin Metal Films (Bonding Energy and Technical Potential) Invited Peer-reviewed

    T. Shimatsu, M. Uomoto, H. Kon

    SEMICONDUCTOR WAFER BONDING 13: SCIENCE, TECHNOLOGY, AND APPLICATIONS 64 (5) 317-328 2014

    DOI: 10.1149/06405.0317ecst  

    ISSN: 1938-5862

  98. Co/Ptナノドットにおけるマイクロ波アシスト効果のサイズ依存性

    古田正樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    電気学会 マグネティックス研究会資料 MAG-13-132 2013/12

  99. Microwave assistance effect on magnetization switching in Co-Cr-Pt granular film Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Akira Hotta, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS LETTERS 103 (20) 202405(1-4) 2013/11

    DOI: 10.1063/1.4830364  

    ISSN: 0003-6951

    eISSN: 1077-3118

  100. Co/Ptナノドットアレイを用いたマイクロ波アシスト磁化反転実験とその反転挙動解析

    古田正樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    電気学会 マグネティックス研究会資料 2013 (68) MAG-13-071-19 2013/08

  101. Microwave assisted magnetization switching experiment on Co/Pt nanodot array and its behavior

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    IEICE Technical Report 113 (102) 7-11 2013/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  102. Analytical study experimental verifications on microwave assisted magnetization switching

    Satoshi Okamoto, Masaki Furuta, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    IEICE Technical Report 113 (102) 33-38 2013/06/21

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  103. 原子拡散接合法によるウエハの室温接合技術の現状と課題 Invited

    島津 武仁, 魚本 幸, 今 一恵

    溶接学会 第103回マイクロ接合研究委員会資料 11-18 2013/05/24

  104. Stoner-Wohlfarth Like Magnetization Switching in Very Small Co/Pt Nanodots under the Assistance of Radio Frequency Magnetic Field Peer-reviewed

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS EXPRESS 6 (5) 053006(1-4) 2013/05

    DOI: 10.7567/APEX.6.053006  

    ISSN: 1882-0778

    eISSN: 1882-0786

  105. Switching Behaviors and its Dynamics of a Co/Pt Nanodot Under the Assistance of rf Fields Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

    PHYSICAL REVIEW LETTERS 109 (23) 237209(1-4) 2012/12

    DOI: 10.1103/PhysRevLett.109.237209  

    ISSN: 0031-9007

  106. Switching behaviors of Co/Pt nanodots under microwave assistance

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu

    The 186th Topical Symposium of the Magnetic Society of Japan 186 5-10 2012/11/02

    Publisher:

    ISSN: 1882-2940

  107. Write Margin Measurement of Bit Patterned Media With 20 nm Dots Peer-reviewed

    Hideki Saga, Kazuki Shirahata, Ryo Terashima, Takehito Shimatsu, Hajime Aoi, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS 48 (11) 3723-3726 2012/11

    DOI: 10.1109/TMAG.2012.2198796  

    ISSN: 0018-9464

  108. Significant Reduction of Switching Field and its Distribution in Co/Pt Nanodots with Assistance of Radio Frequency Field Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

    APPLIED PHYSICS EXPRESS 5 (9) 093005(1-3) 2012/09

    DOI: 10.1143/APEX.5.093005  

    ISSN: 1882-0778

  109. 垂直磁気異方性を有するナノ磁性ドットを用いた マイクロ波アシスト磁化反転

    岡本 聡, 菊池伸明, 古田正樹, 北上 修, 島津武仁

    マグネティクス研究会資料 2012/08

  110. Microwave assisted magnetization switching in Co/Pt nanodots

    Satoshi Okamoto, Nobuaki Kikuchi, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu, Hajime Aoi

    IEICE Technical Report 112 (80) 21-24 2012/06/14

  111. Dry-etching damage to magnetic anisotropy of Co-Pt dot arrays characterized using anomalous Hall effect Peer-reviewed

    T. Shimatsu, H. Kataoka, K. Mitsuzuka, H. Aoi, N. Kikuchi, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 111 (7) 07B908(1-3) 2012/04

    DOI: 10.1063/1.3676061  

    ISSN: 0021-8979

    eISSN: 1089-7550

  112. Frequency and Time Dependent Microwave Assisted Switching Behaviors of Co/Pt Nanodots Peer-reviewed

    Satoshi Okamoto, Nobuaki Kikuchi, Jin Li, Osamu Kitakami, Takehito Shimatsu, Hajime Aoi

    APPLIED PHYSICS EXPRESS 5 (4) 043001(1-3) 2012/04

    DOI: 10.1143/APEX.5.043001  

    ISSN: 1882-0778

  113. Atomic diffusion bonding of wafers in air with thin Au films and its application to optical devices fabrication Peer-reviewed

    T. Shimatsu, M. Uomoto, K. Oba, Y. Furukata

    Proceedings of 2012 3rd IEEE International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2012 103 2012

    DOI: 10.1109/LTB-3D.2012.6238063  

  114. Atomic diffusion bonding with thin nanocrystalline metal films in vacuum and in an inert gas Peer-reviewed

    T. Shimatsu, M. Uomoto

    Proceedings of 2012 3rd IEEE International Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2012 155 2012

    DOI: 10.1109/LTB-3D.2012.6238077  

  115. Impact of Multidomain Dots on Write Margin in Bit Patterned Media Recording Peer-reviewed

    Hideki Saga, Kazuki Shirahata, Kaname Mitsuzuka, Takehito Shimatsu, Hajime Aoi, Hiroaki Muraoka

    IEEE TRANSACTIONS ON MAGNETICS 47 (10) 2528-2531 2011/10

    DOI: 10.1109/TMAG.2011.2157478  

    ISSN: 0018-9464

  116. Magnetic anisotropy and order parameter for L10 type FePt polycrystalline films with (001) preferred grain orientation Peer-reviewed

    D. Inoue, T. Shimatsu, Y. Inaba, H. Aoi, S. Okamoto, O. Kitakami

    Journal of Applied Physics in press 2011/09

  117. Temperature dependence of the magnetic properties of L1(1)-type Co-Ni-Pt ordered alloy films for thermally assisted recording media Peer-reviewed

    Junichi Sayama, Takehito Shimatsu, Hiroaki Nemoto, Satoshi Okamoto, Osamu Kitakami, Hajime Aoi

    JOURNAL OF APPLIED PHYSICS 110 (1) 013918(1-5) 2011/07

    DOI: 10.1063/1.3608123  

    ISSN: 0021-8979

  118. Measurement of Write Margin of BPM using Static-tester Peer-reviewed

    K. Shirahata, H. Saga, K. Miura, T. Shimatsu, H. Aoi, H. Muraoka

    Journal of the Magnetics Society of Japan 35 (3) 171-174 2011/05/01

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/msjmag.1104R002  

    ISSN: 1882-2924

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    Bit patterned media (BPM) recording has been studied as one of the possible candidates for future perpendicular magnetic recording. For the basic R/W evaluating of BPM system, small areas of media samples are suitable in most cases. A static tester is useful to measure such small areas of BPM to evaluate their read-write characteristics. We have prepared a tester, and found that measurement with write synchronization was possible. We report here the experimental results obtained from investigations into the write-margin measurements of the BPM. A position margin of 50∼71 % of the dot period was confirmed, and we found the margin loss was related to the formation of multi-domain dots.

  119. Experimental write margin analysis of bit patterned media Peer-reviewed

    Hideki Saga, Kazuki Shirahata, Kaname Mitsuzuka, Takehito Shimatsu, Hajime Aoi, Hiroaki Muraoka

    JOURNAL OF APPLIED PHYSICS 109 (7) 07B721(1-3) 2011/04

    DOI: 10.1063/1.3554201  

    ISSN: 0021-8979

  120. Dot arrays of L1(0)-type FePt ordered alloy perpendicular films fabricated using low-temperature sputter film deposition Peer-reviewed

    T. Shimatsu, Y. Inaba, H. Kataoka, J. Sayama, H. Aoi, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 109 (7) 07B726(1-3) 2011/04

    DOI: 10.1063/1.3556697  

    ISSN: 0021-8979

  121. Characterization of coercivity at a recording speed of granular media for thermally assisted recording Peer-reviewed

    D. Inoue, Y. Inaba, K. Komiyama, T. Shimatsu

    JOURNAL OF APPLIED PHYSICS 109 (7) 07B727(1-3) 2011/04

    DOI: 10.1063/1.3556698  

    ISSN: 0021-8979

  122. Microwave assisted magnetization switching in Co/Pt multilayer Peer-reviewed

    S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu, H. Aoi

    JOURNAL OF APPLIED PHYSICS 109 (7) 07B748(1-3) 2011/04

    DOI: 10.1063/1.3561780  

    ISSN: 0021-8979

  123. Write-margin Estimation of BPM using Static-tester

    Kazuki SHIRAHATA, Hideki SAGA, Kenji MIURA, Takehito SHIMATSU, Hajime AOI, Hiroaki MURAOKA

    IEICE Technical Report 110 (329) 39-43 2010/12/02

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  124. Atomic diffusion bonding of wafers with thin nanocrystalline metal films Peer-reviewed

    T. Shimatsu, M. Uomoto

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 28 (4) 706-714 2010/07

    DOI: 10.1116/1.3437515  

    ISSN: 1071-1023

  125. Thermally induced switching field distribution of a single CoPt dot in a large array Peer-reviewed

    J. B. C. Engelen, M. Delalande, A. J. le Febre, T. Bolhuis, T. Shimatsu, N. Kikuchi, L. Abelmann, J. C. Lodder

    NANOTECHNOLOGY 21 (3) 035703(1-7) 2010/01

    DOI: 10.1088/0957-4484/21/3/035703  

    ISSN: 0957-4484

    eISSN: 1361-6528

  126. Room Temperature Bonding of Wafers with Thin Nanocrystalline Metal Films Invited Peer-reviewed

    T. Shimatsu, M. Uomoto

    SEMICONDUCTOR WAFER BONDING 11: SCIENCE, TECHNOLOGY, AND APPLICATIONS - IN HONOR OF ULRICH GOSELE 33 (4) 61-72 2010

    DOI: 10.1149/1.3483494  

    ISSN: 1938-5862

  127. Atomic diffusion bonding of wafers with thin nanocrystalline metal films

    T. Shimatsu, M. Uomoto

    Journal of Vacuum Science and Technology B:Nanotechnology and Microelectronics 28 (4) 706-714 2010

    Publisher: AVS Science and Technology Society

    DOI: 10.1116/1.3437515  

    ISSN: 2166-2754 2166-2746

  128. Magnetic anisotropy of L1(1)-type (Co1-XMX)(50)Pt-50 (M:Ni, Fe, Cr, Mn) and Co-50(Pt1-XPdX)(50) ordered alloy perpendicular films Peer-reviewed

    H. Kataoka, H. Sato, T. Shimatsu, S. Okamoto, O. Kitakami, H. Aoi

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 (10) 102002(4pp) 2010

    DOI: 10.1088/1742-6596/200/10/102002  

    ISSN: 1742-6588

  129. Nucleation size of hcp-CoPt dot arrays characterized by time dependence of coercivity Peer-reviewed

    N. Kikuchi, K. Mitsuzuka, T. Shimatsu, O. Kitakami, H. Aoi

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 (10) 102003(4pp) 2010

    DOI: 10.1088/1742-6596/200/10/102003  

    ISSN: 1742-6588

  130. Remanence coercivity of dot arrays of hcp-CoPt perpendicular films Peer-reviewed

    K. Mitsuzuka, T. Shimatsu, N. Kikuchi, S. Okamoto, H. Aoi, O. Kitakami

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 (10) 102005(4pp) 2010

    DOI: 10.1088/1742-6596/200/10/102005  

    ISSN: 1742-6588

  131. Magnetic and structural properties of L1(1) type CoPt-C ordered alloy perpendicular films as a function of C content Peer-reviewed

    T. Shimatsu, H. Sato, H. Kataoka, S. Okamoto, O. Kitakami, H. Aoi

    INTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 (10) 102008(4pp) 2010

    DOI: 10.1088/1742-6596/200/10/102008  

    ISSN: 1742-6588

  132. Read-Write Characteristics Evaluation of BPM with Static Tester

    Hajime AOI, Hideki SAGA, Ryosuke TATSUNO, Kazuki SHIRAHATA, Kaname MITSUZUKA, Kenji MIURA, Takehito Shimatsu, Hiroaki MURAOKA

    IEICE Technical Report 109 (328) 13-18 2009/12/03

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.33.57.0_13  

  133. Bistability Condition of Circular Nanomagnet Peer-reviewed

    Osamu Kitakami, Satoshi Okamoto, Nobuaki Kikuchi, Takehito Shimatsu, Kaname Mitsuzuka, Hajime Aoi

    APPLIED PHYSICS EXPRESS 2 (12) 123002(1-3) 2009/12

    DOI: 10.1143/APEX.2.123002  

    ISSN: 1882-0778

  134. Magnetic anisotropy of epitaxially grown Co and its alloy thin films Peer-reviewed

    J-J Wang, T. Sakurai, K. Oikawa, K. Ishida, N. Kikuchi, S. Okamoto, H. Sato, T. Shimatsu, O. Kitakami

    JOURNAL OF PHYSICS-CONDENSED MATTER 21 (18) 185008(1-6) 2009/05

    DOI: 10.1088/0953-8984/21/18/185008  

    ISSN: 0953-8984

  135. Magnetic properties of thin hard/soft-stacked dot arrays with a large uniaxial magnetic anisotropy Peer-reviewed

    K. Mitsuzuka, T. Shimatsu, N. Kikuchi, O. Kitakami, H. Muraoka, H. Aoi

    JOURNAL OF APPLIED PHYSICS 105 (7) 07C103(1-3) 2009/04

    DOI: 10.1063/1.3072014  

    ISSN: 0021-8979

  136. Dot arrays of L1(1) type Co-Pt ordered alloy perpendicular films Peer-reviewed

    T. Shimatsu, H. Sato, K. Mitsuzuka, H. Kataoka, H. Aoi, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 105 (7) 07C109(1-3) 2009/04

    DOI: 10.1063/1.3068539  

    ISSN: 0021-8979

  137. Fabrication of L1(1)-type (Co-Ni)-Pt ordered alloy films by sputter deposition Peer-reviewed

    H. Sato, T. Shimatsu, H. Kataoka, H. Aoi, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 105 (7) 07B726(1-3) 2009/04

    DOI: 10.1063/1.3072758  

    ISSN: 0021-8979

  138. 記録材料のナノサイズ領域における磁化挙動の検討

    菊池 伸明, 岡本 聡, 北上 修, 島津 武仁, 佐藤 英夫, 三塚 要, 青井 基

    The 165th Topical Symposium of the Magnetic Society of Japan 2009/03

  139. Magnetic behavior of single nanostructured magnet Invited Peer-reviewed

    O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, H. Sato, H. Aoi

    Journal of Physics: Conference Series 165 012029(1-6) 2009

    Publisher: Institute of Physics Publishing

    DOI: 10.1088/1742-6596/165/1/012029  

    ISSN: 1742-6596 1742-6588

  140. Magnetization behavior of nanomagnets for patterned media application Invited Peer-reviewed

    S. Okamoto, N. Kikuchi, T. Kato, O. Kitakami, K. Mitsuzuka, T. Shimatsu, H. Muraoka, H. Aoi, J. C. Lodder

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 320 (22) 2874-2879 2008/11

    DOI: 10.1016/j.jmmm.2008.07.034  

    ISSN: 0304-8853

  141. Thermal stability and switching field of hard/soft-stacked perpendicular media Peer-reviewed

    T. Shimatsu, N. Asakura, Y. Inaba, K. Kudo, A. Sato, H. Muraoka, H. Aoi, S. Okamoto, O. Kitakami

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 320 (22) 3088-3091 2008/11

    DOI: 10.1016/j.jmmm.2008.08.020  

    ISSN: 0304-8853

  142. 大きな垂直磁気異方性を有する磁性薄膜の形成とビット・パターン媒体への応用

    島津武仁, 佐藤英夫, 青井 基, 岡本 聡, 北上 修

    応用物理学会応用電子物性分科会会誌 14 (4) 113-118 2008/10

  143. L11-Type Co-Pt Ordered Alloy Films Fabricated by Sputter Deposition Peer-reviewed

    T. Shimatsu, H. Sato, H. Aoi, H. Muraoka, S. Okamoto, O. Kitakami

    Magnetics Japan 3 (6) 271-276 2008/06

    Publisher:

    ISSN: 1880-7208

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    トピックス

  144. Fabrication of L1(1) type Co-Pt ordered alloy films by sputter deposition Peer-reviewed

    H. Sato, T. Shimatsu, Y. Okazaki, H. Muraoka, H. Aoi, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 103 (7) 07E114(1-3) 2008/04

    DOI: 10.1063/1.2830097  

    ISSN: 0021-8979

  145. Magnetic properties of Co-Pt/Co hard/soft stacked dot arrays Peer-reviewed

    K. Mitsuzuka, T. Shimatsu, H. Muraoka, H. Aoi, N. Kikuchi, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 103 (7) 07C504(1-3) 2008/04

    DOI: 10.1063/1.2833308  

    ISSN: 0021-8979

  146. Uniaxial magnetic anisotropy in Co and Co-Pt based perpendicular films in relation to lattice deformation Peer-reviewed

    T. Shimatsu, Y. Okazaki, H. Sato, H. Muraoka, H. Aoi, T. Sakurai, S. Okamoto, O. Kitakami, S. Tanii, A. Sakuma

    JOURNAL OF APPLIED PHYSICS 103 (7) 07F524(1-3) 2008/04

    DOI: 10.1063/1.2835448  

    ISSN: 0021-8979

  147. Magnetization behavior of nanomagnets for patterned media application

    S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu

    IEICE Technical Report 107 (324) 7-12 2007/11/09

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 1342-6893

  148. Microstructure, magnetic properties and their seed layer thickness dependences of granular CoPtCr-SiO2 perpendicular recording media Peer-reviewed

    Xiao Chun-Tao, Inaba Yuki, Shimatsu Takehito, Muraoka Hiroaki

    SOLID STATE COMMUNICATIONS 144 (1-2) 58-60 2007/10

    DOI: 10.1016/j.ssc.2007.07.014  

    ISSN: 0038-1098

  149. Pt content dependence of the switching field distributions of CoPtCr-SiO2 perpendicular media characterized by subtracting the effect of thermal agitation Peer-reviewed

    T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2091-2093 2007/06

    DOI: 10.1109/TMAG.2007.892586  

    ISSN: 0018-9464

  150. Recording resolution and writability for (Co-Pt)-SiO2/Co-SiO2 hard/soft-stacked granular perpendicular media Peer-reviewed

    T. Shimatsu, Y. Inaba, S. Watanabe, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2103-2105 2007/06

    DOI: 10.1109/TMAG.2007.892539  

    ISSN: 0018-9464

  151. Magnetic anisotropy of Co-M-Pt (M = Cr, Mo, Ru, W, Re) perpendicular films denosited on various eed laver materials Peer-reviewed

    H. Sato, T. Shimatsu, Y. Okazaki, O. Kitakami, S. Okamoto, H. Aoi, Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2106-2108 2007/06

    DOI: 10.1109/TMAG.2007.892540  

    ISSN: 0018-9464

    eISSN: 1941-0069

  152. Switching field and thermal stability of CoPt/Ru dot arrays with various thicknesses Peer-reviewed

    K. Mitsuzuka, N. Kikuchi, T. Shimatsu, O. Kitakami, H. Aoi, H. Muraoka, J. C. Lodder

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2160-2162 2007/06

    DOI: 10.1109/TMAG.2007.893129  

    ISSN: 0018-9464

    eISSN: 1941-0069

  153. Large uniaxial magnetic anisotropy of Co-Pt perpendicular films induced by lattice deformation Peer-reviewed

    T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2995-2997 2007/06

    DOI: 10.1109/TMAG.2007.893126  

    ISSN: 0018-9464

  154. Magnetic Properties of Hard/Soft-Stacked Perpendicular Media Having Very Thin Soft Layers with a High Saturation Magnetization Peer-reviewed

    Y. Inaba, T. Shimatsu, S. Watanabe, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi, Y. Nakamura

    Journal of the Magnetics Society of Japan 31 (3) 178-183 2007/05

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.31.178  

    ISSN: 0285-0192

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    The magnetic properties and recording performance of hard/soft-stacked media consisting of a magnetically hard layer (9-10 nm) underneath a very thin soft layer (2 nm) with a large saturation magnetization were investigated. Magnetic energy calculations revealed that reducing the strength of the interfacial exchange coupling between the hard and soft layers reduces the remanence coercivity, Hr. Moreover, an increase in the saturation magnetization of the soft layer <Mssoft> significantly enhances the Hr reduction. It is theoretically predicted that the grain volume of hard (10 nm)/soft (2 nm) stacked media having <Mssoft> of 1000 emu/cm3 could be reduced to about 1/3 that of conventional media whilst maintaining good recording writability and thermal stability. An experimental study of stacked media revealed that the magnetization reversal mechanism changed systematically as a function of the strength of the interfacial exchange coupling, as predicted theoretically. The Hr reduction on adjusting the interfacial coupling reached 22% of that of media consisting of directly coupled hard/soft grains. It was successfully demonstrated that hard/soft-stacked media having thin soft layers with a large <Mssoft> showed better recording writability without degradation of SNmR, recording resolution, or thermal stability.

  155. Microstructure and magnetic properties of granular CoPtCr-SiO2 films on Ru seed layer Peer-reviewed

    Chun-Tao Xiao, Yuki Inaba, Takehito Shimatsu, Hiroaki Muraoka

    Modern Physics Letters B 21 (6) 357-363 2007/03/10

    DOI: 10.1142/S0217984907012736  

    ISSN: 0217-9849

  156. Pt content dependence of magnetic properties of CoPt/Ru patterned films Peer-reviewed

    K. Mitsuzuka, N. Kikuchi, T. Shimatsu, O. Kitakami, H. Aoi, H. Muraoka, J. C. Lodder

    IEEE TRANSACTIONS ON MAGNETICS 42 (12) 3883-3885 2006/12

    DOI: 10.1109/TMAG.2006.878667  

    ISSN: 0018-9464

  157. Investigation of inclined-pad-type head for cylindrical magnetic storage system Peer-reviewed

    H. Yamada, R. Tsuchiyama, H. Kikuchi, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 42 (10) 2477-2479 2006/10

    DOI: 10.1109/TMAG.2006.879573  

    ISSN: 0018-9464

  158. Switching field distribution of CoPtCr-SiO2 perpendicular recording media obtained by subtracting thermal agitation of magnetization Peer-reviewed

    T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 42 (10) 2384-2386 2006/10

    DOI: 10.1109/TMAG.2006.878663  

    ISSN: 0018-9464

  159. Magnetic properties to optimize the K-u2 effect in perpendicular recording media Peer-reviewed

    Hideo Sato, Takehito Shimatsu, Takeshi Kondo, Sadayuki Watanabe, Osamu Kitakami, Satoshi Okamoto, Hajime Aoi, Hiroaki Muraoka, Yoshihisa Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 42 (10) 2387-2389 2006/10

    DOI: 10.1109/TMAG.2006.878668  

    ISSN: 0018-9464

  160. Investigation of Inclined-Pad Type Head for High Transfer-rate Cylindrical Magnetic Storage System

    Hiroshi YAMADA, Tsuchiyama RYUJI, Hiroyuki KIKUCHI, Takehito SHIMATSU, Isao WATANABE, Hajime AOI, Hiroaki MURAOKA, Yoshihisa NAKAMURA, Junji NUMAZAWA

    IEICE Technical Report 106 (142) 35-40 2006/06/29

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

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    MR2006-16, 通研インポート200703

  161. CoPt/Ru垂直磁化パターン膜の磁気特性と磁化機構

    島津 武仁, 菊池 伸明, J. C. Lodder

    The 148th Topical Symposium of the Magnetic Society of Japan 148 1-6 2006/05/18

    ISSN: 1340-7562

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    2006年5月18日<br />

  162. Study on Flying Stability of Inclined-pad-type Slider for Cylindrical Magnetic Media Peer-reviewed

    R. Tsuchiyama, H. Yamada, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 30 (3) 361-365 2006/05

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.361  

    ISSN: 0285-0192

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  163. R/W Performance of CoPtCr-SiO2 Perpendicular Cylindrical Media Using an Inclined-Pad-Type SPT Head Peer-reviewed

    H. Yamada, R. Tsuchiyama, H. Kikuchi, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 30 (3) 345-348 2006/05

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.345  

    ISSN: 0285-0192

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  164. Effect of thermal agitation on the switching field distributions of CoPtCr-SiO2 perpendicular recording media Peer-reviewed

    T Shimatsu, T Kondo, K Mitsuzuka, S Watanabe, H Aoi, H Muraoka, Y Nakamura

    JOURNAL OF APPLIED PHYSICS 99 (8) 08F905(1-3) 2006/04

    DOI: 10.1063/1.2172577  

    ISSN: 0021-8979

  165. CoPtCr-SiO2 media with K-u2 magnetic anisotropy term fabricated with Pd seed layers Peer-reviewed

    H. Sato, T. Shimatsu, T. Kondo, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 99 (8) 08G907(1-3) 2006/04

    DOI: 10.1063/1.2166587  

    ISSN: 0021-8979

    eISSN: 1089-7550

  166. Large uniaxial magnetic anisotropy by lattice deformation in CoPt/Ru perpendicular films Peer-reviewed

    T. Shimatsu, H. Sato, Y. Okazaki, H. Aoi, H. Muraoka, Y. Nakamura, S. Okamoto, O. Kitakami

    JOURNAL OF APPLIED PHYSICS 99 (8) 08G908(1-3) 2006/04

    DOI: 10.1063/1.2167351  

    ISSN: 0021-8979

    eISSN: 1089-7550

  167. Study of stacking fault effect on magnetic anisotropy of CoPtCr-SiO2 perpendicular media by synchrotron radiation x-ray diffraction Peer-reviewed

    T Kubo, Y Kuboki, R Tanuma, A Saito, S Watanabe, T Shimatsu

    JOURNAL OF APPLIED PHYSICS 99 (8) 08G911(1-3) 2006/04

    DOI: 10.1063/1.2172896  

    ISSN: 0021-8979

  168. Thermal stability and recording writability of hard/soft stacked perpendicular media Peer-reviewed

    Y Inaba, T Shimatsu, H Aoi, H Muraoka, Y Nakamura, O Kitakami

    JOURNAL OF APPLIED PHYSICS 99 (8) 08G913(1-3) 2006/04

    DOI: 10.1063/1.2177068  

    ISSN: 0021-8979

  169. Magnetization Reversal and Switching Field of CoPt/Ru Patterned Films Peer-reviewed

    K. Mitsuzuka, T. Shimatsu, H. Muraoka, N. Kikuchi, J.C. Lodder

    Journal of the Magnetics Society of Japan 30 (2) 100-107 2006/02

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.100  

    ISSN: 0285-0192

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  170. Large uniaxial magnetic anisotropy in Co100-xPtx/Ru disordered perpendicular films Peer-reviewed

    T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    INTERMAG 2006 - IEEE International Magnetics Conference 169 2006

    DOI: 10.1109/INTMAG.2006.375669  

  171. Magnetization process of high anisotropy CoPt nanosized dots Peer-reviewed

    N Kikuchi, R Murillo, JC Lodder, K Mitsuzuka, Shimatsu, I

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 3613-3615 2005/10

    DOI: 10.1109/TMAG.2005.854784  

    ISSN: 0018-9464

  172. CoPtCr-SiO2 perpendicular media for high density recording with a high order magnetic anisotropy energy term Peer-reviewed

    T Shimatsu, H Sato, T Oikawa, K Mitsuzuka, Y Inaba, O Kitakami, S Okamoto, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 3175-3177 2005/10

    DOI: 10.1109/TMAG.2005.855282  

    ISSN: 0018-9464

    eISSN: 1941-0069

  173. Activation volumes in CoPtCr-SiO2 perpendicular recording media Peer-reviewed

    Y Inaba, T Shimatsu, H Muraoka, JD Dutson, K O'Grady

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 3130-3132 2005/10

    DOI: 10.1109/TMAG.2005.854850  

    ISSN: 0018-9464

  174. Preliminary study on (CoPtCr/NiFe)-SiO2 hard/soft-stacked perpendicular recording media Peer-reviewed

    Y Inaba, T Shimatsu, O Kitakami, H Sato, T Oikawa, H Muraoka, H Aoi, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 3136-3138 2005/10

    DOI: 10.1109/TMAG.2005.854848  

    ISSN: 0018-9464

  175. グラニュラ垂直磁気記録媒体の高密度化に向けて

    島津 武仁, 北上 修, 青井 基, 村岡 裕明, 中村 慶久

    The 144th Topical Symposium of the Magnetic Society of Japan 2005/10

  176. Nanostructure of CoPtCr-SiO2 granular films for magnetic recording media Peer-reviewed

    S Fukami, N Tanaka, T Shimatsu, O Kitakatmi

    MATERIALS TRANSACTIONS 46 (8) 1802-1806 2005/08

    DOI: 10.2320/matertrans.46.1802  

    ISSN: 1345-9678

    eISSN: 1347-5320

  177. Depth profile of spin and orbital magnetic moments in a subnanometer Pt film on Co Peer-reviewed

    M Suzuki, H Muraoka, Y Inaba, H Miyagawa, N Kawamura, T Shimatsu, H Maruyama, N Ishimatsu, Y Isohama, Y Sonobe

    PHYSICAL REVIEW B 72 (5) 054430(1-8) 2005/08

    DOI: 10.1103/PhysRevB.72.054430  

    ISSN: 1098-0121

  178. Magnetization Reversal and Thermal Stability of CoPt/Ru Patterned Films

    Takehito Shimatsu, Kaname MITSUZUKA, Hiroaki MURAOKA, Nobuaki KIKUCHI, J. C. Lodder

    IEICE Technical Report 105 (167) 25-30 2005/07/01

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  179. Examination of CoPtCr-SiO2 Perpendicular Double-Layered Cylindrical Media Using an Inclined-Pad-Type Head Peer-reviewed

    H. Yamada, R. Tsuchiyama, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 29 (5) 549-552 2005/05

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.549  

    ISSN: 0285-0192

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  180. K-u2 magnetic anisotropy term of CoPtCr-SiO2 media for high density recording Peer-reviewed

    T Shimatsu, H Sato, K Mitsuzuka, T Oikawa, Y Inaba, H Aoi, H Muraoka, Y Nakamura

    JOURNAL OF APPLIED PHYSICS 97 (10) 10N111(1-3) 2005/05

    DOI: 10.1063/1.1851918  

    ISSN: 0021-8979

    eISSN: 1089-7550

  181. Crystallographic analysis of CoPtCr-SiO2 perpendicular recording media with high anisotropy using synchrotron radiation X-ray diffraction Peer-reviewed

    T Kubo, Y Kuboki, M Ohsawa, R Tanuma, A Saito, Oikawa, I, H Uwazumi, T Shimatsu

    JOURNAL OF APPLIED PHYSICS 97 (10) 10R510(1-3) 2005/05

    DOI: 10.1063/1.1855572  

    ISSN: 0021-8979

  182. Ku2 term of magnetic anisotropy and microstructure of CoPtCr-SiO2 perpendicular recording media Peer-reviewed

    H. Sato, T. Shimatsu, K. Mitsuzuka, T. Oikawa, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi, Y. Nakamura

    Journal of the Magnetics Society of Japan 29 (4) 427-431 2005/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.427  

    ISSN: 0285-0192

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  183. Preliminary study of Hard/Soft-stacked Perpendicular Recording Media Peer-reviewed

    Y. Inaba, T. Shimatsu, O. Kitakami, H. Sato, T. Oikawa, H. Muraoka, H. Aoi, Y. Nakamura

    Journal of the Magnetics Society of Japan 29 (3) 239-242 2005/03

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.239  

    ISSN: 0285-0192

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  184. SiO2 Contents to Enhance Grain Isolation in CoPtCr-SiO2/Ru Perpendicular Recording Media Peer-reviewed

    T. Oikawa, T. Shimatsu, Y. Inaba, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 29 (3) 231-234 2005/03

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.231  

    ISSN: 0285-0192

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  185. Read/write performance of perpendicular double-layered cylindrical media Peer-reviewed

    H Yamada, T Shimatsu, Watanabe, I, R Tsuchiyama, H Aoi, H Muraoka, Y Nakamura

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 287 486-490 2005/02

    DOI: 10.1016/j.jmmm.2004.10.080  

    ISSN: 0304-8853

  186. High-potential magnetic anisotropy of CoPtCr-SiO2 perpendicular recording media Invited Peer-reviewed

    T Shimatsu, H Sato, T Oikawa, Y Inaba, O Kitakami, S Okamoto, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 41 (2) 566-571 2005/02

    DOI: 10.1109/TMAG.2004.838071  

    ISSN: 0018-9464

    eISSN: 1941-0069

  187. Magnetic moment in the top Pt layer of Co/Pt bilayers Peer-reviewed

    M. Suzuki, H. Miyagawa, N. Kawamura, H. Muraoka, Y. Inaba, T. Shimatsu, Y. Sonobe, Y. Isohama, N. Nakamura, N. Ishimatsu, H. Maruyama

    Physica Scripta T T115 580-582 2005

    DOI: 10.1238/Physica.Topical.115a00580  

    ISSN: 0281-1847

  188. Magnetic moment in the top Pt layer of Co/Pt bilayers Peer-reviewed

    Suzuki, M, Miyagawa, H, Kawamura, N, Muraoka, H, Inaba, Y, Shimatsu, T, Sonobe, Y, Isohama, Y, Nakamura, N, Ishimatsu, N

    PHYSICA SCRIPTA T115 580-582 2005

    Publisher: IOP PUBLISHING LTD

    ISSN: 0031-8949

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    The magnetic properties of a few atomic Pt layers on a 15 nm thick Co film were studied by X-ray magnetic circular dichroism spectroscopy at the Pt L-2,L-3 edges. The spin and orbital magnetic moments of the Pt 5d electrons were separated using the magneto-optical sum rules. The Pt magnetization pro. le as a function of distance from the Co-Pt interface was determined using data from a series of films with various Pt thicknesses. This magnetization pro. le was approximated by an exponential function with a decay length of 0.41 nm, which characterizes the effective range of the magnetic coupling between Co and Pt. The total magnetic moment of a Pt atom at the interface was 0.7 mu(B)/atom including a 13% orbital moment. This is discussed in the context of the thermal stability of magnetic recording media capped with a thin layer of Pt.

  189. CoPtCr-SiO2 perpendicular media with the high order energy term of magnetic anisotropy for high density recording Peer-reviewed

    Shimatsu, T, Sato, H, Oikawa, T, Mitsuzuka, K.a, Inaba, Y, Aoi, H.a, Muraoka, H.a, Nakamura, Y, Kitakami, O, Okannoto, S

    Digests Int. Magnet. Conf. 791-791 2005

  190. 日本応用磁気学会 第144回研究会資料(2005) Invited Peer-reviewed

    島津武仁, 北上修, 青井基, 村岡裕明, 中村慶久

    日本応用磁気学会 第144回研究会資料 2005

  191. Higher Energy Term of Magnetic Anisotropy in CoPtCr-SiO2 Perpendicular Recording Media for High Density Recording Invited

    Takehito SHIMATSU, Osamu KITAKAMI, Hajime AOI, Hiroaki MURAOKA, Yoshihisa NAKAMURA

    IEICE Technical Report 104 (408) 5-10 2004/10/28

  192. Investigation of High Transfer-Rate Cylindrical Magnetic Storage System

    Hiroshi YAMADA, Takehito SHIMATSU, Tsuchiyama RYUJI, Isao WATANABE, Hajime AOI, Hiroaki MURAOKA, Yoshihisa NAKAMURA

    IEICE Technical Report 104 (330) 19-24 2004/09/30

  193. Optimization of the SiO2 content in CoPtCr-SiO2 perpendicular recording media for high-density recording Peer-reviewed

    Y Inaba, T Shimatsu, S Oikawa, H Sato, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 40 (4) 2486-2488 2004/07

    DOI: 10.1109/TMAG.2004.832451  

    ISSN: 0018-9464

  194. Thickness reduction in CoPtCr-SiO2 perpendicular recording media to improve media performance Peer-reviewed

    T Shimatsu, T Oikawa, Y Inaba, H Sato, Watanabe, I, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 40 (4) 2461-2463 2004/07

    DOI: 10.1109/TMAG.2004.832359  

    ISSN: 0018-9464

  195. High perpendicular magnetic anisotropy of CoPtCr/Ru films for granular-type perpendicular media Peer-reviewed

    T Shimatsu, H Sato, T Oikawa, Y Inaba, O Kitakami, S Okamoto, H Aoi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 40 (4) 2483-2485 2004/07

    DOI: 10.1109/tmag.2004.832448  

    ISSN: 0018-9464

    eISSN: 1941-0069

  196. Dependence of the Magnetic Properties of CoPtCr-SiO2/Ru Perpendicular Recording Media on the Pt, Cr Composition Peer-reviewed

    T. Oikawa, T. Shimatsu, Y. Inaba, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 28 (3) 254-257 2004/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.28.254  

    ISSN: 0285-0192

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  197. Evaluation of Read-Resolution Using Fabricated head-Sliders for Cylindrical Magnetic Media Peer-reviewed

    H. Yamada, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 28 (4) 561-564 2004/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.28.561  

    ISSN: 0285-0192

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  198. 1-1 Read/write performance of high transfer-rate cylindrical storage system

    Yamada H., Shimatsu T., Watanabe I., Aoi H., Muraoka H., Nakamura Y.

    PROCEEDINGS OF THE ITE ANNUAL CONVENTION 2004 _1-1-1_-_1-1-2_ 2004

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/iteac.2004.0__1-1-1_  

    ISSN: 1343-1846

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    A cylindrical magnetic storage system aiming at realization of high transfer-rate and high areal-density was built as a trial. The system has the possibility of simplifying multiple-head control. Double-layered perpendicular medium was made on the cylindrical substrate and fundamental read/write characteristics using a single-pole-type writer and a GMR reader for cylindrical media were obtained.

  199. Sharrock relation for perpendicular recording media with higher-order magnetic anisotropy terms Peer-reviewed

    O Kitakami, T Shimatsu, S Okamoto, Y Shimada, H Aoi

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 43 (1A-B) L115-L117 2004/01

    DOI: 10.1143/JJAP.43.L115  

    ISSN: 0021-4922

  200. Preliminary investigation for a cylindrical magnetic storage system Peer-reviewed

    H Yamada, T Shimatsu, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 39 (6) 3619-3621 2003/11

    DOI: 10.1109/TMAG.2003.815433  

    ISSN: 0018-9464

  201. Development of ultra-high density perpendicular recording media [Invited] Peer-reviewed

    T. Shimatsu, O. Kitakami

    Digests of International Symposium on Ultra-High Density Spinic Storage Systems (TA-07) 22-27 2003/10/30

  202. Large perpendicular magnetic anisotropy of CoPtCr/Ru films for granular-type perpendicular media Peer-reviewed

    T. Shimatsu, H. Sato, T. Oikawa, Y. Inaba, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    Digests of International Symposium on Ultra-High Density Spinic Storage Systems (PS-19) 68-69 2003/10/30

  203. Formation of magnetic cluster and remanence coercivity in granular-type perpendicular media Peer-reviewed

    T Shimatsu, T Oikawa, Y Inaba, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 39 (5) 2335-2337 2003/09

    DOI: 10.1109/TMAG.2003.816289  

    ISSN: 0018-9464

    eISSN: 1941-0069

  204. CoPtCr-SiO2 Granular Perpendicular Recording Media Invited Peer-reviewed

    S. Takenoiri, Y. Sakai, K. Enomoto, T. Oikawa, S. Watanabe, H. Uwazumi, T. Shimatsu, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 27 (4) 940-945 2003/09

    ISSN: 1340-8100

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    トピックス &lt;RIEC&gt;&lt;DUMMY&gt;あ&lt;/DUMMY&gt;&lt;BIBID&gt;2003500404&lt;/BIBID&gt;&lt;/RIEC&gt;

  205. Effect of lattice strain on soft magnetic properties in FeCo/NiFe(Cr) thin films with 2.4 T Peer-reviewed

    T Shimatsu, H Katada, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 39 (5) 2365-2367 2003/09

    DOI: 10.1109/TMAG.2003.815451  

    ISSN: 0018-9464

  206. Magnetic cluster size and activation volume in perpendicular recording media Peer-reviewed

    T Shimatsu, H Uwazumi, T Oikawa, Y Inaba, H Muraoka, Y Nakamura

    JOURNAL OF APPLIED PHYSICS 93 (10) 7732-7734 2003/05

    DOI: 10.1063/1.1557967  

    ISSN: 0021-8979

  207. Magnetic Properties and Recording Performance of CoPtCr-SiO2 Perpendicular Recording Media Peer-reviewed

    T. Oikawa, H. Uwazumi, T. Shimatsu, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 27 (4) 196-199 2003/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.196  

    ISSN: 0285-0192

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  208. Preliminary Examination of a Crlindrical Magnetic Storage System Peer-reviewed

    H. Yamada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 27 (4) 265-268 2003/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.265  

    ISSN: 0285-0192

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  209. Effects of Boron Doping and NiAl Seed Layer on Magnetic and R/W Characteristics of Co/Pt Superlattice Perpendicular Recording Media Peer-reviewed

    T. Shimatsu, T. Igari, M. Terakawa, I. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 27 (4) 210-214 2003/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.210  

    ISSN: 0285-0192

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  210. Interlayer Coupling and Domain Structure in SUL for Perpendicular Recording Media Peer-reviewed

    T. Shimatsu, K. Honma, I. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 27 (4) 230-233 2003/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.230  

    ISSN: 0285-0192

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  211. Magnetic cluster size and magnetization curves in perpendicular recording media Peer-reviewed

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura

    Joint NAPMRC 2003 - Digest of Technical Papers [Perpendicular Magnetic Recording Conference] 35 2003

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/NAPMRC.2003.1177039  

  212. Magnetization reversal and activation volume of perpendicular recording media Peer-reviewed

    T Shimatsu, H Uwazumi, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 38 (5) 1973-1975 2002/09

    DOI: 10.1109/TMAG.2002.801790  

    ISSN: 0018-9464

  213. Microstructure and magnetic properties of CoPtCr-SiO2 perpendicular recording media Peer-reviewed

    T Oikawa, M Nakamura, H Uwazumi, T Shimatsu, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 38 (5) 1976-1978 2002/09

    DOI: 10.1109/TMAG.2002.801791  

    ISSN: 0018-9464

  214. Thermal agitation of magnetization and recording performance of Co(B)-Pd superlattice perpendicular recording media Peer-reviewed

    T Shimatsu, M Terakawa, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 38 (5) 2048-2050 2002/09

    DOI: 10.1109/TMAG.2002.801830  

    ISSN: 0018-9464

  215. Soft magnetic properties and microstructure of NiFe(Cr)/FeCo/NiFe(Cr) films with large saturation magnetization Peer-reviewed

    H Katada, T Shimatsu, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 38 (5) 2225-2227 2002/09

    DOI: 10.1109/TMAG.2002.802668  

    ISSN: 0018-9464

  216. High mobility of surface atoms and induced anisotropy in very thin permalloy films Peer-reviewed

    H Katada, T Shimatsu, H Watanabe, Watanabe, I, H Muraoka, Y Nakamura, Y Sugita

    IEEE TRANSACTIONS ON MAGNETICS 38 (5) 2664-2666 2002/09

    DOI: 10.1109/TMAG.2002.801974  

    ISSN: 0018-9464

  217. Reduction of Media Noise and Thermal Stability in Perpendicular Recording Media

    Takehito SHIMATSU, Hiroyuki UWAZUMI, Hiroaki MURAOKA, Yoshihisa NAKAMURA

    IEICE Technical Report 102 (186) 7-12 2002/06/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  218. Temperature Dependence ofInduced Magnetic Anisotropy in Very Thin Permalloy Films Peer-reviewed

    H. Katada, T. Shimatsu, H. Watanabe, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    Journal of the Magnetics Society of Japan 26 (5) 752-755 2002/05

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.26.752  

    ISSN: 0285-0192

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    The induced uniaxial anisotropy field Hk in very thin Ni79Fe21 films, sandwiched by seed and protective Ta layers, was investigated. Films prepared by using a UHV sputtering process show a very sharp fiber texture of fcc-<111> even with a film thickness of 3 nm. The Hk value was found to decrease as the film thickness decreases below 20 nm, even after an annealing procedure in a magnetic field. The change in the induced anisotropy energy Ku was measured as a function of the temperature while applying a dc magnetic field parallel to the hard axis of magnetization. The value of Ku of as-deposited thin films decreases significantly with increasing temperature from 50°C to 100°C. The Ku reduction in a film of 5 nm reaches ∼40% of that of the original value. It is likely that the Ku reduction at temperatures below 100°C is mainly caused by alignment of atom pairs at film surfaces. The thickness of film surfaces with highly mobile atoms was estimated to be 5-6 A. The high mobility of surface atoms may disrupt the alignment of atom-pairs parallel to the field direction during the film deposition and annealing process, resulting in the smaller Hk of very thin films.

  219. Recording performance and magnetization switching of CoTb/CoCrPt composite perpendicular media Peer-reviewed

    H Uwazumi, T Shimatsu, Y Sakai, K Enomoto, S Takenoiri, S Watanabe, H Muraoka, Y Nakamura

    JOURNAL OF APPLIED PHYSICS 91 (10) 8058-8060 2002/05

    DOI: 10.1063/1.1452273  

    ISSN: 0021-8979

  220. High thermal stability in CoPrTb/CoCrTa composite perpendicular media Peer-reviewed

    T Shimatsu, H Muraoka, Y Nakamura, Y Sonobe, Y Satodate, K Muramatsu, Watanabe, I

    JOURNAL OF APPLIED PHYSICS 91 (10) 8061-8063 2002/05

    DOI: 10.1063/1.1452274  

    ISSN: 0021-8979

  221. Switching field distribution of 40 Gbit/in.(2) longitudinal media obtained by subtracting thermal agitation of magnetization Peer-reviewed

    H Uwazumi, T Shimatsu, Y Kuboki

    JOURNAL OF APPLIED PHYSICS 91 (10) 7095-7097 2002/05

    DOI: 10.1063/1.1456393  

    ISSN: 0021-8979

  222. A Simple Analysis for Magnetic Behaviors of Exchange-Coupled Granular/Continuous Perpendicular Magnetic Recording Media Peer-reviewed

    Osamu Kitakami, Takehito Shimatsu, Hiroaki Muraoka

    Japanese Journal of Applied Physics 41 (4B) L455-L457 2002/04/15

    Publisher: The Japan Society of Applied Physics

    DOI: 10.1143/JJAP.41.L455  

    ISSN: 0021-4922

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    Volume 41 (2002) No. 4B (Apr 15)

  223. Initial Growth Layer and Magnetic Properties of CoCrPt Perpendicular Media Peer-reviewed

    H. Uwazumi, T. Shimatsu, M. Terakawa, Y. Sakai, S. Takenoiri, S. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 26 (4) 205-209 2002/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.26.205  

    ISSN: 0285-0192

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    Reduction of the thickness of the initial film-growth layer of CoCrPt-based perpendicular recording media was investigated using TiCr, CoCr, and Ru seed layers. Magnetic analysis revealed that the initial layer has small perpendicular magnetic anisotropy Ku, and that the thickness of the initial layer was about 10-15 nm with a TiCr seed layer, and 1-6 nm with a CoCr or a Ru seed layer. X-ray diffraction patterns and TEM images indicated that the initial layer contains an fcc-like structure, and that many stacking faults exist in CoCrPt-based perpendicular films, even with a CoCr or a Ru seed layer, The improvement in epitaxial film growth obtained by using a CoCr or a Ru seed layer is very effective in reducing the thickness of the initial layer, while is found to prevent the segregation of Cr from Co, resulting in larger intergranular exchange coupling.

  224. Perpendicular Magnetic Anisotropy and Thermal Agitation of Magnetization in Co(-B)/Pd Superlattice perpendicular Recording Media Peer-reviewed

    T. Shimatsu, M, Terakawa, I. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 26 (4) 219-223 2002/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.26.219  

    ISSN: 0285-0192

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    Magnetic properties and recording performance are discussed for [Co/Pd (1 nm)]9 and [(Co-27 at% B)/Pd (1 nm)]9 superlattice perpendicular recording media as a function of the Co or Co-B layer thickness, δCo or δCoB. The perpendicular magnetic anisotropy Ku of these media shows maximum values of 5.7 x 106 erg/cm3 (Co/Pd) and 3.2 x 106 erg/cm3 (Co-B/Pd) at δCo or δCoB of around 0.2-0.3 nm. The KuV/kT (V; the activation volume, k; the Boltmann constant, T; the absolute temperature) of the Co/Pd medium has large values of more than 200 (δCo>0.3nm), while the KuV/kT in both media significantly decreases as the thickness decreases, which is not coincident with the thickness dependence of Ku. The value of Ku/2πMs2 (Ms; the saturation magnetization) in both media increase monotonically as the thickness decrease, and is ∼10 at δCo or δCoB of around 0.2-0.3 nm. The signal-to-medium-noise ratio SNmR of the Co-B/Pd media is higher than that of the Co/Pd media, and increase as δCoB decrease. TEM images and magnetic characterization revealed that these differences in SNmR are mainly due to the difference in the strength of intergranular exchange coupling.

  225. Thermal Stability and Recording Performance in Co-PrTb/Co-Cr-Ta Composite Perpendicular Magnetic Recording Media Peer-reviewed

    T. Shimatsu, H. Muraoka, Y. Satodate, I. Watanabe, Y. Nakamura

    Journal of the Magnetics Society of Japan 26 (4) 229-232 2002/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.26.229  

    ISSN: 0285-0192

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    The thermal stability and medium noise performance of Co100-X(PrTb)X/Co-Cr-Ta (X = 21-31.7 at%) composite perpendicular media are discussed. The perpendicular magnetic anisotropy Ku shows a maximum at X = ∼25, although the saturation magnetization decreases gradually as X increases. The ratio of "intrinsic" remanence coercivity obtained by subtracting the termal agitation to the anisotropy field, H0/Hk, increases as X increases, indicating a reduction of the exchange coupling of magnetization. The medium noise of the composite media, which have CoZrNb soft back-layers, decreases gradually as X increases and as the Co-PrTb thickness decreases, resulting in a higher signal-to-medium-noise ratio SNmR. The SNmR fo a Co76.5(PrTb)23.5 (5 nm) / Co77Cr19Ta4 (25 nm) composite medium is about 8 dB higher than that of a Co77Cr19Ta4 (30 nm) medium at 300 kFRPI. The composite media show high thermal stability of read-back signals even at low recording density. However, the thermal signal-decay increases gradually as the Co-PrTb thickness decreases, and also as X increases, indicating that the thermal stability has a trade-off relation with the medium noise performance.

  226. Soft Magnetic Properties of FeCo Film Prepared using UHV Sputtering Process and Application to Single Pole Head

    Hiroyuki KATADA, Takehito SHIMATSU, Masaharu TAKAHASHI, Isao WATANABE, Hiroaki MURAOKA, Yoshihisa NAKAMURA

    IEICE Technical Report 101 (564) 17-24 2002/01/10

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.26.1.0_17  

    ISSN: 1342-6893

  227. Magnetization reversal of perpendicualr recording media characterized using a pulse magnetometer Peer-reviewed

    T. Shimatsu, H. Uwazumi, H. Muraoka, Y. Nakamura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference 2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/INTMAG.2002.1001310  

  228. Soft magnetic properties and microstructure in NiFe/FeCo/NiFe films with large saturation magnetization Peer-reviewed

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    INTERMAG Europe 2002 - IEEE International Magnetics Conference 26 (4) 505-508 2002

    Publisher: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/INTMAG.2002.1000670  

  229. Perpendicular magnetic anisotropy and thermal agitation of magnetization in Co(B)/Pd superlattice perpendicular recording media

    T. Shimatsu, M. Terakawa, I. Watanabe, H. Muraoka, Y. Nakamura

    IEICE Technical Report 101 (335) 9-14 2001/10/04

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.25.62.0_9  

    ISSN: 1342-6893

  230. Thermal stability in perpendicular recording media Invited Peer-reviewed

    T Shimatsu, H Uwazumi, H Muraoka, Y Nakamura

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 235 (1-3) 273-280 2001/10

    DOI: 10.1016/S0304-8853(01)00358-4  

    ISSN: 0304-8853

  231. Thermal agitation of magnetization in CoCrPt perpendicular recording media Peer-reviewed

    T Shimatsu, H Uwazumi, Y Sakai, A Otsuki, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 37 (4) 1567-1569 2001/07

    DOI: 10.1109/20.950902  

    ISSN: 0018-9464

  232. Recording performance of CoCrPt-(Ta, B)/TiCr perpendicular recording media Peer-reviewed

    H Uwazumi, T Shimatsu, Y Sakai, A Otsuki, Watanabe, I, H Muraoka, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 37 (4) 1595-1598 2001/07

    DOI: 10.1109/20.950911  

    ISSN: 0018-9464

  233. Induced uniaxial magnetic anisotropy and film magneto striction in very thin permalloy films Peer-reviewed

    H Katada, T Shimatsu, Watanabe, I, H Muraoka, Y Nakamura, Y Sugita

    IEEE TRANSACTIONS ON MAGNETICS 37 (4) 2334-2336 2001/07

    DOI: 10.1109/20.951164  

    ISSN: 0018-9464

  234. High thermal stability in CoPrTb/CoCrTa coupled granular-continuous perpendicular recording media

    T. Shimatsu, H. Muraoka, Y. Satodate, K. Muramatsu, I. Watanabe, Y. Nakamura

    IEICE Technical Report 101 (106) 19-24 2001/06/01

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.25.37.0_19  

    ISSN: 1342-6893

  235. Initial film growth and perpendicular magnetic anisotropy in CoCrPt perpendicular recording media

    H. Uwazumi, T. Shimatsu, M. Terakawa, H. Muraoka, Y. Nakamura

    IEICE Technical Report 101 (105) 21-26 2001/05/31

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

  236. Effect of Thermal Agitation on Magnetic Properties of CoCr-based Perpendicular Recording Media Peer-reviewed

    T. Shimatsu, H. Uwazumi, I. Watanabe, H. Muraoka, Y. Nakamura

    Journal of the Magnetics Society of Japan 25 (41366) 539-542 2001/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.25.539  

    ISSN: 0285-0192

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    The effect of thermal agitation of magnetization on the magnetic properties of CoCr-based perpendicular recording media was studied using a pulse magnetometer. In media having well-segregated grains, we found that the angular dependence of the "intrinsic" remanence coercivity H0, obtained by subtracting the thermal agitation of magnetization, was nearly the same as that of coherent switching of magnetization calculated by taking account of the angular distribution of the preferred axis. Experimental and theoretical analyses suggested that the achievable maximum value of the ratio of H0 to the anisotropy field Hk is 0.7 to 0.8 at 20-nm thickness. Results show that the value of perpendicular anisotropy Ku must be more than 3 times larger than 2πMs2 values in order to achieve an Mr/Ms of nearly 1.0 resisting the thermal agitation effect in CoCr-based perpendicular media.

  237. Induced Uniaxial Magnetic Anisotropy in Very Thin Soft Magnetic Films Peer-reviewed

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    Journal of the Magnetics Society of Japan 25 (41366) 867-870 2001/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.25.867  

    ISSN: 0285-0192

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    The induced uniaxial anisotropy field Hk in very thin permalloy films, sandwiched by seed and protective Ta and Cu layers, was investigated. The value of Hk of the Ta/Cu/ Ni79Fe21/Cu/Ta films was found to decrease as the film thickness decreases below 20 nm, even after an annealing procedure in a magnetic field. This Hk reduction is similar to that of Ta/Ni79Fe21/Ta films, indicating that the Hk reduction is independent of the surface energy or crystal structure of the seed and protective layers. Thickness dependence of film magnetostriction λp-p of these films did not show any clear correlation with that of Hk, indicating that the Hk reduction is not simply caused by the magnetostrictive effect at thin films. The higher mobility of surface atoms may disrupt the alignment of atom-pairs parallel to the field direction during film deposition and annealing, resulting in the smaller induced anisotropy of very thin films.

  238. 垂直磁気記録媒体の磁気的微細構造と熱緩和

    島津 武仁, 村岡 裕明, 中村 慶久

    The 118th Topical Symposium of the Magnetic Society of Japan 118 57-62 2001/02

    ISSN: 1340-7562

  239. Induced uniaxial magnetic anisotropy and film magnetostriction in very thin soft magnetic films

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    IEICE Technical Report 100 (564) 1-6 2001/01/12

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.25.2.0_1  

    ISSN: 1342-6893

  240. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media Peer-reviewed

    T Shimatsu, SJ Greaves, K Muramatsu, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 36 (5) 2375-2377 2000/09

    DOI: 10.1109/20.908435  

    ISSN: 0018-9464

  241. Induced uniaxial magnetic anisotropy field in very thin NiFe and CoZrNb films Peer-reviewed

    H Katada, T Shimatsu, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 36 (5) 2905-2908 2000/09

    DOI: 10.1109/20.908623  

    ISSN: 0018-9464

  242. Effect of Thermal Agitation on the Magnetic Properties of Granular Perpendicular Recording Media

    T. Shimatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    IEICE Technical Report 100 (106) 7-12 2000/06/01

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.24.32.0_7  

    ISSN: 1342-6893

  243. Induced uniaxial magnetic anisotropy in thin permalloy and CoZrNb films

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    IEICE Technical Report 100 (106) 19-24 2000/06/01

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/itetr.24.32.0_19  

    ISSN: 1342-6893

  244. Effect of a Ti seed layer on the magnetic properties of CoCrTa double-layered perpendicular media Peer-reviewed

    T Shimatsu, H Komagome, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    JOURNAL OF APPLIED PHYSICS 87 (9) 6367-6369 2000/05

    DOI: 10.1063/1.372708  

    ISSN: 0021-8979

  245. Effect of Thermal Agitation on the Magnetic Properties of CoCrTa Perpendicular Recoeding Media Peer-reviewed

    T. Shimatsu, H. Komagome, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    Journal of the Magnetics Society of Japan 24 (2) 239-242 2000/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.24.239  

    ISSN: 0285-0192

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    The effect of thermal agitation of magnetization on the magnetic properties of CoCrTa/Ti perpendicular media was studied by using a pulse magnetometer. The values of the "intrinsic" remanence coercivity H0, obtained by subtracting the thermal agitation of magnetization, are several times larger than those of the remanence coercivity Hr measured experimentally at a field sweep rate of ∼5 Oe/s. The value of H0 gradually approaches Hk as the CoCrTa thickness decreases, and shows values larger than 90 % of Hk at thicknesses of less than 20 nm. This indicates the potential of perpendicular media to achieve Hr values equal to Hk. The activation volume gradually decreases as the thickness decreases, and is nearly the same as the mean grain volume at thicknesses of less than 30 nm. This suggests that magnetization reversal within the grains is uniform at thicknesses of less than 30 nm, even though the grains have an elongated shape (30 nm x 9.52 nm2 at 30 nm thickness, for instance). This will be another advantage of perpendicular media in resisting thermal agitation of magnetization.

  246. Magnetic Properties and Recording Performances of Double-Layered CoCrTa/Ti/M(M : CoZrNb, Fe, Co)Perpendicular Media Peer-reviewed

    H. Komagome, T. Shimatsu, R. Yoshida, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    Journal of the Magnetics Society of Japan 24 (2) 243-246 2000/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.24.243  

    ISSN: 0285-0192

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    The Magnetic properties and recording performances of CoCrTa/Ti/M (M: CoZrNb, Fe, Co) double-layered perpendicular recording media were studied. It was revealed that a thin Ti film of 5 nm gave the most enhanced c-axis alignment perpendicular to the film plane in media with CoZrNb or Fe back-layers, resulting in the highest coercivity and squareness of CoCrTa. The recording performance of media with Fe back-layers, using a single-pole-type writing head, indicated that a thinner back-layer with a high flux density can be used without any reduction of the recording sensitivity and resolution, even though the Fe back-layers do not have good soft magnetic properties. However, hcp-Co back-layers degrade the recording sensitivity and resolution. The media noise of media with Fe or Co back-layers was significantly higher than that of CoZrNb back-layer media. It is suggested that these noise spectra are related to the domain structure of the back-layers.

  247. Induced Uniaxial Magnetic Anisotropy in Thin Permalloy Films Peer-reviewed

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    Journal of the Magnetics Society of Japan 24 (2) 539-542 2000/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.24.539  

    ISSN: 0285-0192

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    The induced anisotropy in thin Ni79Fe21 films was investigated. The value of the induced anisotropy field Hk was found to decrease as the film thickness decreased, particularly below 20 nm, even after an adequate annealing procedure with a magnetic field. The value of Hk at 3 nm was found to be nearly half that at 200 nm. Almost the same thickness dependence of Hk was found to exist in both Ni77Fe23 and Ni81Fe19 films, except for slight differences in the absolute magnitude of Hk, depending on the composition. A series of CoZrNb amorphous films showed a qualitatively similar thickness dependence of Hk. On the other hand, the easy axis of the Ni79Fe21 films thinner than 20 nm was switched to the field direction by annealing with a magnetic field perpendicular to the easy axis of the as-deposited films, even at a low annealing temperature of 220°C. The absolute values of Hk in the 3 and 5 nm films after annealing were nearly as large as in the as-deposited films. It is likely that the rearrangement of atom pairs can easily occur in the surface region, resulting in the switching of the easy axis to the annealing field direction in very thin films.

  248. Thickness dependence of induced magnetic anisotropy in very thin permalloy films

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    Digests of the Intermag Conference 2000

    Publisher: IEEE

    ISSN: 0074-6843

  249. Thermal fluctuation of magnetization in nanocrystalline FePt thin films with high coercivity Peer-reviewed

    T Shimatsu, JC Lodder, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 35 (5) 2697-2699 1999/09

    DOI: 10.1109/20.800956  

    ISSN: 0018-9464

  250. Spin-valve transistor: Technologies and progress Invited Peer-reviewed

    J. C. Lodder, D. J. Monsma, R. Vlutters, T. Shimatsu

    Journal of Magnetism and Magnetic Materials 198 119-124 1999/06/01

    Publisher: Elsevier Science Publishers B.V.

    DOI: 10.1016/S0304-8853(98)01241-4  

    ISSN: 0304-8853

  251. Effect of a Ti Seed-Layer on the Magnetic Properties of CoCrTa/Ti/CoZrNb Perpendicular Recording Media Peer-reviewed

    T. Shimatsu, P. Sulistio, H. Komagome, I. Watanabe, Y. Sugita, Y. Nakamura

    Journal of the Magnetics Society of Japan 23 (2) 969-972 1999/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.23.969  

    ISSN: 0285-0192

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    The effect of a Ti seed-layer on the magnetic properties and microstmctures of CoCrTa was studied in CoCrTa/Ti/CoZrNb double-layered perpendicular recording media. It was revealed that a thin Ti film of 5 nm, deposited at a substrate temperature of 230°C, gave the most enhanced c-axis alignment perpendicular to the film plane, showing the greatest perpendicular anisotropy. This large anisotropy yielded the best magnetic and recording properties under the present experimental conditions. The read-back amplitude at this Ti thickness was 3 times larger than that without the Ti layer, resulting in a higher ratio of signal to media noise. There was no significant loss in recording resolution due to the non-magnetic Ti space between the CoCrTa recording layer and the CoZrNb underlayer.

  252. Metal bonding during sputter film deposition Peer-reviewed

    T Shimatsu, RH Mollema, D Monsma, EG Keim, JC Lodder

    JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS 16 (4) 2125-2131 1998/07

    DOI: 10.1116/1.581319  

    ISSN: 0734-2101

  253. High coercive force and low intergranular coupling in CoCrTa thin-film recording media fabricated under ultra clean sputtering process Peer-reviewed

    M. Imakawa, S. Ishibashi, M. Kuwabara, T. Shimatsu, M. Takahashi

    Journal of Magnetism and Magnetic Materials 182 (3) 403-412 1998/03/04

    Publisher: Elsevier

    DOI: 10.1016/S0304-8853(97)01042-1  

    ISSN: 0304-8853

  254. Magnetic anisotropy and switching field of spindle-shaped metal particles for particulate recording media Peer-reviewed

    M Igaki, H Nagamori, T Shimatsu, M Takahashi

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 183 (1-2) 209-219 1998/03

    DOI: 10.1016/S0304-8853(97)01109-8  

    ISSN: 0304-8853

  255. Latest developments of the spin-valve transistor Invited Peer-reviewed

    JC Lodder, DJ Monsma, R Mollema, T Shimatsu, R Vlutters

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 175 (1-2) 159-159 1997/11

    DOI: 10.1016/S0304-8853(97)00594-5  

    ISSN: 0304-8853

  256. Development of the Spin-valve transistor Invited Peer-reviewed

    D. J. Monsma, T. Shimatsu, R. Vlutters, E. G. Keim, R. H. Mollema, J. C. Lodder

    IEEE Transactions on Magnetics 33 (5) 3495-3499 1997/07

    DOI: 10.1109/20.619478  

  257. Activation volume of FePt-TaN nanocrystalline thin films with high coercivity Peer-reviewed

    T. Shimatsu, E. G. Keim, T. Bolhuis, J. C. Lodder

    Journal of the Magnetics Society of Japan 21 (S2) 313-316 1997

    DOI: 10.3379/jmsjmag.21.S2_313  

  258. Effects of grain size and intergranular coupling on recording characteristics in CoCrTa media Peer-reviewed

    H Sato, A Kikuchi, J Nakai, H Mitsuya, T Shimatsu, M Takahashi

    IEEE TRANSACTIONS ON MAGNETICS 32 (5) 3596-3598 1996/09

    DOI: 10.1109/20.538701  

    ISSN: 0018-9464

  259. Dependence of media noise on grain size and intergranular coupling in thin-film media Peer-reviewed

    A Kikuchi, S Kawakita, J Nakai, T Shimatsu, M Takahashi

    JOURNAL OF APPLIED PHYSICS 79 (8) 5339-5341 1996/04

    DOI: 10.1063/1.361371  

    ISSN: 0021-8979

  260. Effect of Pt on the magnetic anisotropy and intergranular exchange coupling in (Co86Cr12Ta2)(100-x)Pt-x and (Co62.5Ni30Cr7.5)(100-x)Pt-x thin-film media Peer-reviewed

    T Shimatsu, DD Djayaprawira, M Takahashi, T Wakiyama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 155 (1-3) 246-249 1996/03

    DOI: 10.1016/0304-8853(95)00639-7  

    ISSN: 0304-8853

  261. Intergranular magnetic coupling in CoNiCrPt and CoCrTaPt thin-film media characterized by the temperature dependence of the rotational hysteresis loss Peer-reviewed

    T Shimatsu, DD Djayaprawira, A Endo, N Iwata, M Takahashi, T Wakiyama

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 155 (1-3) 242-245 1996/03

    DOI: 10.1016/0304-8853(95)00747-4  

    ISSN: 0304-8853

  262. Intergranular coupling and recording properties of CoCrTa and CoNiCr thin-film media fabricated using an ultraclean sputtering process Peer-reviewed

    A Kikuchi, Okamoto, I, J Nakai, S Kawakita, T Shimatsu, M Takahashi

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 155 (1-3) 238-241 1996/03

    DOI: 10.1016/0304-8853(95)00746-6  

    ISSN: 0304-8853

  263. Microstructure and intergranular coupling in CoCrTa thin-film media fabricated using an ultraclean sputtering process Peer-reviewed

    J Nakai, A Kikuchi, K Nakatani, M Hirasaka, T Shimatsu

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 155 (1-3) 234-237 1996/03

    DOI: 10.1016/0304-8853(95)00745-8  

    ISSN: 0304-8853

  264. Effect of surface cleanness on the magnetic properties of CoNiCr and CoCrTa thin-film media fabricated using an ultraclean sputtering process Peer-reviewed

    S Kawakita, T Sakurai, A Kikuchi, T Shimatsu, M Takahashi

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 155 (1-3) 172-175 1996/03

    DOI: 10.1016/0304-8853(95)00629-X  

    ISSN: 0304-8853

  265. EXTREMELY CLEAN SPUTTERING PROCESS AND MICROSTRUCTURAL PROPERTIES OF NI-FE FILMS FABRICATED BY THIS PROCESS Peer-reviewed

    K OKUYAMA, T SHIMATSU, S KUJI, M TAKAHASHI

    IEEE TRANSACTIONS ON MAGNETICS 31 (6) 3838-3840 1995/11

    DOI: 10.1109/20.489789  

    ISSN: 0018-9464

  266. EFFECT OF MICROSTRUCTURE ON MEDIA NOISE OF COCRTA THIN-FILM MEDIA FABRICATED UNDER ULTRA CLEAN SPUTTERING PROCESS Peer-reviewed

    J NAKAI, M KUWABARA, A KIKUCHI, T SAKURAI, T SHIMATSU, M TAKAHASHI

    IEEE TRANSACTIONS ON MAGNETICS 31 (6) 2833-2835 1995/11

    DOI: 10.1109/20.490167  

    ISSN: 0018-9464

  267. CONTROL OF MAGNETIC-PROPERTIES AND MICROSTRUCTURE OF THIN-FILM RECORDING MEDIA UNDER ULTRACLEAN SPUTTERING PROCESS Peer-reviewed

    T SHIMATSU, M TAKAHASHI

    IEICE TRANSACTIONS ON ELECTRONICS E78C (11) 1550-1556 1995/11

    ISSN: 0916-8524

    eISSN: 1745-1353

  268. Ultra-clean Sputtering Process for Thin Film Recording Media Peer-reviewed

    M. Takahashi, T. Shimatsu

    Journal of the Magnetics Society of Japan 19 (5) 857-863 1995/10

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    トピックス

  269. HIGH COERCIVE FORCE AND LOW INTERGRANULAR COUPLING IN THIN-FILM MEDIA FABRICATED UNDER THE ULTRA CLEAN SPUTTERING PROCESS Invited Peer-reviewed

    T SHIMATSU, M TAKAHASHI

    MATERIALS CHEMISTRY AND PHYSICS 41 (2) 134-140 1995/07

    DOI: 10.1016/0254-0584(95)80018-2  

    ISSN: 0254-0584

  270. Soft Magnetic Properties and Anisotropy of Co-Fe-Ta-N Films Peer-reviewed

    T. Shimatsu, W. Kimura, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 18 (2) 299-302 1994/04

    DOI: 10.3379/jmsjmag.18.299  

  271. Magnetic Anisotropy and Intergranular Magnetic Coupling in (Co86Cr12Ta2)100-xPtx Thin Film Media Peer-reviewed

    T. Shimatsu, S. Yokota, D. D. Djayaprawira, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 18 (2) 89-94 1994/04

    DOI: 10.3379/jmsjmag.18.89  

  272. Soft Magnetic Properties and Anisotropy of Co-Fe-Ta-N Films Peer-reviewed

    T. Shimatsu, W. Kimura, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 9 (6) 132-137 1994

    DOI: 10.1109/TJMJ.1994.4565970  

    ISSN: 0882-4959

  273. Magnetic Anisotropy and Intergranular Magnetic Coupling in (Co86Cr12Ta2)100-xPtx Thin Film Media Peer-reviewed

    T. Shimatsu, S. Yokota, D. D. Djayaprawira, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 9 (4) 34-40 1994

    DOI: 10.1109/TJMJ.1994.4565889  

    ISSN: 0882-4959

  274. Experimental Characterization of Intergranular Exchange Coupling in CoCrTaPt and CoNiCrPt Thin Film Media Peer-reviewed

    T. Shimatsu, D. D. Djayaprawira, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 18 (S1) 269-274 1994

    DOI: 10.3379/jmsjmag.18.S1_269  

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    PMRC 1994, JST.JSTAGE/jmsjmag/18.S1_269

  275. EXPERIMENTAL CHARACTERIZATION OF MAGNETIC ANISOTROPY AND INTERGRANULAR INTERACTION FOR THIN FILM MEDIA Invited Peer-reviewed

    T SHIMATSU, M TAKAHASHI, M SUEKANE, M MIYAMURA, K YAMAGUCHI, H YAMASAKI

    ADVANCED MATERIALS '93, II - A & B 15 (A & B) 777-782 1994

  276. A Study on the Magnetic Microstructure of CoCrTa/Cr Film Media, Using Rotational Hysteresis Loss Analysis Peer-reviewed

    T. Shimatsu, K. Mitarai, M. Kobayashi, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 17 (2) 83-88 1993/04

    DOI: 10.3379/jmsjmag.17.83  

  277. Study on Magnetic Anisotropy for Fe Based Particulate Medium Peer-reviewed

    M. Igaki, S. Yokota, M. Kunii, T. Shimatsu, M. Takahashi

    Journal of the Magnetics Society of Japan 17 (2) 77-82 1993/04

    DOI: 10.3379/jmsjmag.17.77  

  278. Soft Magnetic Properties and Microstructure of Co-Ta-N Films Peer-reviewed

    T. Shimatsu, W. Kimura, K. Satoh, H. Shoji, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 17 (2) 327-332 1993/04

    DOI: 10.3379/jmsjmag.17.327  

  279. MAGNETIC EVALUATION OF INTERGRANULAR INTERACTIONS IN THIN-FILM MEDIA BY ROTATIONAL HYSTERESIS LOSS ANALYSIS Peer-reviewed

    M TAKAHASHI, T SHIMATSU, M SUEKANE, M MIYAMURA, K YAMAGUCHI, H YAMASAKI

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 120 (1-3) 229-231 1993/03

    DOI: 10.1016/0304-8853(93)91329-6  

    ISSN: 0304-8853

  280. A Study on the Magnetic Microstructure of CoCrTa/Cr Film Media, Using Rotational Hysteresis Loss Analysis Peer-reviewed

    T. Shimatsu, K. Mitarai, M. Kobayashi, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 8 (9) 578-584 1993

    DOI: 10.1109/TJMJ.1993.4565700  

    ISSN: 0882-4959

  281. Study on Magnetic Anisotropy for Fe Based Particulate Medium Peer-reviewed

    M. Igaki, S. Yokota, M. Kunii, T. Shimatsu, M. Takahashi

    IEEE Translation Journal on Magnetics in Japan 8 (11) 742-749 1993

    DOI: 10.1109/TJMJ.1993.4565739  

    ISSN: 0882-4959

  282. Study on the Magnetic Microstructures for CoNiPt Thin Film Media by Rotational Hysteresis Loss Analysis Peer-reviewed

    M. Suekane, M. Miyamura, T. Shimatsu, M. Takahashi

    IEEE Translation Journal on Magnetics in Japan 8 (6) 388-395 1993

    DOI: 10.1109/TJMJ.1993.4565648  

    ISSN: 0882-4959

  283. Soft Magnetic Properties and Microstructure of Co-Ta-N Films Peer-reviewed

    T. Shimatsu, W. Kimura, K. Satoh, H. Shoji, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 8 (12) 927-933 1993

    DOI: 10.1109/TJMJ.1993.4565774  

    ISSN: 0882-4959

  284. Characterization of Magnetization Reversal Mechanism for Magnetic Recording Media by Rotational Hysteresis Loss Analysis Peer-reviewed

    T. Shimatsu, M. Takahashi

    Journal of the Magnetics Society of Japan 17 (S2) 255-262 1993

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.17.S2_255  

    ISSN: 0285-0192

  285. MAGNETIZATION REVERSAL MECHANISM EVALUATED BY ROTATIONAL HYSTERESIS LOSS ANALYSIS FOR THE THIN-FILM MEDIA Peer-reviewed

    M TAKAHASHI, T SHIMATSU, M SUEKANE, M MIYAMURA, K YAMAGUCHI, H YAMASAKI

    IEEE TRANSACTIONS ON MAGNETICS 28 (5) 3285-3287 1992/09

    DOI: 10.1109/20.179785  

    ISSN: 0018-9464

  286. Study on the Magnetic Microstructures for CoNiPt Thin Film Media by Rotational Hysteresis Loss Analysis Peer-reviewed

    M. Suekane, M. Miyamura, T. Shimatsu, Migaku Takahashi

    Journal of the Magnetics Society of Japan 16 (4) 655-660 1992/08

    DOI: 10.3379/jmsjmag.16.655  

  287. Magnetic Properties of Fe–Co–(Zr, Ta) Films Fabricated in Ar+N2 Plasma Peer-reviewed

    T. Shimatsu, H. Uwazumi, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 7 (4) 301-305 1992

    DOI: 10.1109/TJMJ.1992.4565383  

    ISSN: 0882-4959

  288. Soft Magnetic Properties for Fe–B Films Sputtered in Ar+N2 Plasma Peer-reviewed

    T. Shimatsu, Y. Sakai, M. Takahashi, T. Wakiyama, K. Hiraga

    IEEE Translation Journal on Magnetics in Japan 7 (2) 103-112 1992

    DOI: 10.1109/TJMJ.1992.4565341  

    ISSN: 0882-4959

  289. Fabrication and Magnetic Properties of Fe Thin Films on a Substrate Excited by SAW Peer-reviewed

    M. Takahashi, T. Tanaka, T. Shimatsu, M. Uemura, T. Wakiyama, J. Yamada, T. Shibata

    IEEE Translation Journal on Magnetics in Japan 7 (1) 81-87 1992

    DOI: 10.1109/TJMJ.1992.4565330  

    ISSN: 0882-4959

  290. Soft magnetism of nanocrystalline films – Recent advances and physics – Invited Peer-reviewed

    M. Takahashi, T. Shimatsu, H. Shoji

    Digests of the 6th International Conference on Ferrites, ICF 6 446 1992

  291. Soft Magnetic Properties for Fe-B Films Sputtered in Ar+N2 Plasma Peer-reviewed

    T. Shimatsu, Y. Sakai, M. Takahashi, T. Wakiyama, K. Hiraga

    Journal of the Magnetics Society of Japan 15 (2) 351-356 1991/04

    DOI: 10.3379/jmsjmag.15.351  

  292. Effects of Underlayer on Magnetic Properties of CoNiCr Thin Film Media Sputtered on Glass Substrate Peer-reviewed

    J. I. Horikawa, M. Kobayashi, K. Moroishi, T. Shimatsu, M. Takahashi, K. Osakabe, S. Nakayama, Y. Yamaguchi, A. J. Ikushima, T. Wakiyama

    Journal of the Magnetics Society of Japan 15 (2) 89-92 1991/04

    DOI: 10.3379/jmsjmag.15.89  

  293. Fabrication and Magnetic Properties of Fe Thin Films on the Substrate Excited by SAW Peer-reviewed

    Migaku Takahashi, T. Tanaka, T. Shimatsu, M. Uemura, T. Wakiyama, J. Yamada, T. Shiba

    Journal of the Magnetics Society of Japan 15 (2) 323-326 1991/04

    DOI: 10.3379/jmsjmag.15.323  

  294. Magneto-Optical Effect of Fe-Ni, Ni-Co, Fe-Co Binary Alloy Films Peer-reviewed

    T. Sato, T. Simatsu, T. Miyahara, T. Miyazaki

    Journal of the Magnetics Society of Japan 15 (2) 197-200 1991/04

    DOI: 10.3379/jmsjmag.15.197  

  295. Magnetic Properties of Fe-Co-(Zr, Ta) Films Fabricated in Ar+N2 Plasma Peer-reviewed

    T. Shimatsu, H. Uwazumi, Migaku Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 15 (2) 375-378 1991/04

    DOI: 10.3379/jmsjmag.15.375  

  296. Effects of Underlayer on Magnetic Properties of CoNiCr Thin Film Media Sputtered on Glass Substrates Peer-reviewed

    J. I. Horikawa, M. Kobayashi, K. Moroishi, T. Shimatsu, M. Takahashi, K. Osakabe, S. Nakayama, Y. Yamaguchi, A. J. Ikushima, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 6 (8) 641-647 1991

    DOI: 10.1109/TJMJ.1991.4565228  

    ISSN: 0882-4959

  297. Soft Magnetic Properties of Ni-Fe-Nb Alloy Films with Nearly 50 wt% Ni Concentration Peer-reviewed

    Migaku Takahashi, H. Uwazumi, T. Shimatsu, T. Sato, Minoru Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 6 (2) 112-119 1991

    DOI: 10.1109/TJMJ.1991.4565120  

    ISSN: 0882-4959

  298. Fabrication and Magnetic Properties of Thin Films Sputtered on the Substrate Excited by SAW Peer-reviewed

    M. Takahashi, A. Fujita, T. Shimatsu, T. Wakiyama, J. Yamada, T. Shiba

    IEEE Translation Journal on Magnetics in Japan 6 (2) 127-133 1991

    DOI: 10.1109/TJMJ.1991.4565122  

    ISSN: 0882-4959

  299. Structure and Magnetic Properties for Fe-C Films Fabricated in Ar+N2 Plasma Peer-reviewed

    M. Takahashi, T. Shimatsu, Y. Sakai, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 6 (1) 71-77 1991

    DOI: 10.1109/TJMJ.1991.4565109  

    ISSN: 0882-4959

  300. Magnetic Properties of Fe-Si-N Films Sputtered in (Ar+N2) Plasma Peer-reviewed

    M. Takahashi, H. Komaba, H. Shoji, T. Shimatsu, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 6 (1) 78-84 1991

    DOI: 10.1109/TJMJ.1991.4565110  

    ISSN: 0882-4959

  301. Magnetostriction and magnetic anisotropy for Fe based soft magnetic films Peer-reviewed

    T. Shimatsu, H. Shoji, M. Kyoho, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 15 (S2) 63-68 1991

    DOI: 10.3379/jmsjmag.15.S2_63  

    More details Close

    PMRC 1991, JST.JSTAGE/jmsjmag/15.S2_63

  302. Change of microscopical anisotropy on film thickness for Fe based soft magnetic films Peer-reviewed

    H. Shoji, Y. Sakai, T. Shimatsu, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 15 (S2) 561-566 1991

    DOI: 10.3379/jmsjmag.15.S2_561  

    More details Close

    PMRC 1991, JST.JSTAGE/jmsjmag/15.S2_561

  303. SOFT MAGNETIC-PROPERTIES AND MICROSTRUCTURES FOR THE FE BASED SPUTTERED FILMS WITH HIGH BS Invited Peer-reviewed

    M TAKAHASHI, T SHIMATSU

    MAGNETIC MATERIALS : MICROSTRUCTURE AND PROPERTIES 232 223-232 1991

  304. Soft magnetism of nanocrystalline Fe based sputtered films with high Bs Invited Peer-reviewed

    Migaku Takahashi, T. Shimatsu

    Journal of Magnetism and Magnetic Materials 101 (1-3) 11-15 1991

    DOI: 10.1016/0304-8853(91)90660-3  

    ISSN: 0304-8853

  305. SOFT MAGNETIC-PROPERTIES OF FE-N AND FE-SI-N THIN-FILMS SPUTTERED IN (AR+N2) PLASMA Peer-reviewed

    M TAKAHASHI, H SHOJI, T SHIMATSU, H KOMABA, T WAKIYAMA

    IEEE TRANSACTIONS ON MAGNETICS 26 (5) 1503-1505 1990/09

    DOI: 10.1109/20.104425  

    ISSN: 0018-9464

  306. NEW THIN-FILM FABRICATION TECHNIQUE USING A SUBSTRATE EXCITED BY SAW Peer-reviewed

    M TAKAHASHI, A FUJITA, T SHIMATSU, T WAKIYAMA, J YAMADA, T SHIBA

    IEEE TRANSACTIONS ON MAGNETICS 26 (5) 1453-1455 1990/09

    DOI: 10.1109/20.104408  

    ISSN: 0018-9464

  307. Soft Magnetic Properties of Ni-Fe-Nb Alloy Films with Nearly 50wt% Ni Concentration Peer-reviewed

    Migaku Takahashi, H. Uwazumi, T. Shimatsu, T. Sato, Minoru Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 14 (2) 305-308 1990/08

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.14.305  

    ISSN: 0285-0192

    More details Close

    The relation between soft magnetic properties and local anisotropy fluctuation, which is strongly connected with the microstructure of the films, was systematically examined for Ni-Fe-Nb alloy films with nearly 50 wt%Ni. According to the micromagnetic ripple theory by Hoffmann, effective magnetic anisotropy Ueff in each of the grains decreases drastically with increases in the number of grains N within the coupling volume. Experimental results show local anisotropy fluctuation for Ni-Fe-Nb alloy films strongly depends on Ueff/Ku, and it decreases with decreasing Ueff/Ku. Therefore, to realize high initial permeability in these films, it is necessary to increase N within the coupling volume by decreasing the size of the grains. In the case of Ni-Fe-Nb alloy films, decreasing the size of the grains less than 200Å to obtain high initial permeability more than 2000 is needed.

  308. Structure and Magnetic Properties for Fe-C Films Fabricated in Ar+N2 Plasma Peer-reviewed

    M. Takahashi, T. Shimatsu, Y. Sakai, T. Wakiyama

    Journal of the Magnetics Society of Japan 14 (2) 297-300 1990/08

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.14.297  

    ISSN: 0285-0192

    More details Close

    Soft magnetic properties for Fe-C films sputtered in Ar+N2 plasma were examined and a discussion was developed for the relations between effective permeability μeff and metallurgical structure such as grain size and lattice strain. Excellent soft magnetic properties, μeff=1400, were obtained in Fe-1.6 at%C-N films annealed at 300°C at which temperature martensite phase ((bct)Fe-C) disappeared. From the X-ray diffracted line from (110) crystal plane of α-Fe, it was found that films consists of fine grains. This fact might suggest that the formation of iron nitride rather than that of Fe3C by annealing at 300°C plays an important role in making the fine grains in films. In the films with high μeff, lattice spacing of (110) crystal plane of α-Fe is slightly expanded about 0.1%. These results suggest that total magnetic anisotropy energy in (110) plane in each α-Fe grains decreases by the induced magneto-elastic anisotropy due to tetragonal deformation.

  309. Magnetic Properties of Fe-Si-N Films Sputtered in (Ar+N2) Plasma Peer-reviewed

    M. Takahashi, H. Komaba, H. Shoji, T. Shimatsu, T. Wakiyama

    Journal of the Magnetics Society of Japan 14 (2) 301-304 1990/08

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.14.301  

    ISSN: 0285-0192

    More details Close

    Excellent soft magnetic properties, high μeff (2000 at 5 MHz) and high Bs (2.2T) were obtained in Fe films fabricated by using the facing target type dc magnetron sputtering method in Ar+N2 plasma and annealed at 300°C. In these films, (110) preferred orientation of grains and the reduction of grain size of below 150Å were observed. Lattice spacing of (110) plane was found to be expanded by 0.28% from the bulk value. Considering the magnetostrictive anisotropy due to lattice strain, total anisotropy energy in (110) plane of grain was calculated. The results show that total anisotropy energy decreases and takes minimum at lattice spacing of (110) slightly expanded from bcc to bet by 0.28%. This value agrees well with the expansion of bcc lattice for the films which show high μeff. Excellent soft magnetic properties were realized by decreases of total anisotropy of grain by lattice strain and reduction of grain size, and were not related to the magnetostriction of films.

  310. Fabrication and Magnetic Properties of Thin Films Sputtered on the Substrate Excited by SAW Peer-reviewed

    M. Takahashi, A. Fujita, T. Shimatsu, T. Wakiyama, J. Yamada, T. Shiba

    Journal of the Magnetics Society of Japan 14 (2) 323-326 1990/08

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.14.323  

    ISSN: 0285-0192

    More details Close

    Permalloy films of 300Å thickness were prepared by d.c. magnetron sputtering onto LiNbO3 single crystal substrate excited by SAW at 45 MHz. Film structure such as shapes and size of grains was found to be drastically changed as a function of excited amplitude. Especially in the case of 24Åo-p for excited amplitude, films consisted of very fine homogeneous grains and showed magnetic softness, namely minimum coercive force. Uniaxial anisotropy was induced in plane for all the films examined; however, in the critical excited amplitude mentioned above, a drastic change of the easy axis in plane was found. As a conclusion, film preparation onto the substrate excited by SAW is considered to be a highly useful method to control the microscopical film structure and also the magnetic properties.

  311. Soft Magnetic Properties of Fe-Ni-Nb Alloy Films Peer-reviewed

    T. Shimatsu, M. Takahashi, H. Uwazumi, T. Sato, M. Takahashi, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 5 (7) 547-553 1990

    DOI: 10.1109/TJMJ.1990.4564141  

    ISSN: 0882-4959

  312. Soft Magnetic Properties of Fe–Al–Si and Fe–Ni–Nb Sputtered Alloy Films Peer-reviewed

    M. Takahashi, T. Sato, T. Shimatsu, M. Takahashi

    IEEE Translation Journal on Magnetics in Japan 5 (1) 2-16 1990

    DOI: 10.1109/TJMJ.1990.4564097  

    ISSN: 0882-4959

  313. Soft Magretism of Crystalline Fe Based Alloy Sputtered Films (invited) Invited Peer-reviewed

    Migaku Takahashi, T. Shimatsu

    IEEE Transactions on Magnetics 26 (5) 1485-1490 1990

    DOI: 10.1109/20.104420  

    ISSN: 1941-0069 0018-9464

  314. Soft Magnetic Properties of Fe-Ni-Nb Alloy Films Peer-reviewed

    T. Shimatsu, M. Takahashi, H. Uwazumi, T. Sato, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 13 (2) 281-284 1989/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.13.281  

    ISSN: 0285-0192

    More details Close

    Relation between soft magnetic properties and local anisotropy fluctuation in Fe-Ni-Nb alloy films measured by the dynamic differential susceptibility method was clarified and discussed in comparison with Fe-Si-Al alloy films. In Fe-Ni-Nb alloy films, excellent soft magnetic properties, μeff=6500 at 5 MHz of 1000Å film thickness, were realized. In Fe-Si-Al alloy films, the magnitude of μeff is proportional to 1/√S (S: structure constant) and independent of the value of HK, while in Fe-Ni-Nb alloy films, the value of S is about one tenth of that in Fe-Si-Al alloy films, and the magnitude of μeff is not dependent on the value of S. Rather, this magnitude is dependent on the value of Hk, and is almost equal to 4πMs/Hk (obtained from a rotational magnetization model in a uniaxal single domain particle).

  315. Soft Magnetic Properties of Fe-Co/ZrO Multilayered Films Peer-reviewed

    T. Miyazaki, F. Sato, M. Takahishi, T. Tanaka, T. Shimatsu

    Journal of the Magnetics Society of Japan 13 (2) 241-244 1989/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.13.241  

    ISSN: 0285-0192

    More details Close

    The dependence of soft magnetic properties on the thickness and composition has been investigated for sputtered Fe-Co/ZnO multilayers. The coercivity decreases with the decrease in average size of crystallites D, in particular from 9 to 17 nm for all multilayers except Co/ZnO. Magnetic properties with Hc=160 A/m and μe(10 MHz)=800 are obtained for Fe/ZnO and 24Co-Fe/ZnO multilayers with D=2∼3 nm.

  316. Local Anisotropy Fluctuation on the Permeability of Sputtered Sendust Alloy Films Peer-reviewed

    M. Takahashi, T. Shimatsu, H. Shoji, T. Wakiyama, N. Kato

    IEEE Translation Journal on Magnetics in Japan 4 (10) 598-607 1989

    DOI: 10.1109/TJMJ.1989.4564066  

    ISSN: 0882-4959

  317. Effect of local anisotropy fluctuation on soft magnetic properties for Fe and Fe based alloy films Peer-reviewed

    T. Shimatsu, M. Takahashi, T. Wakiyama

    Journal of the Magnetics Society of Japan 13 (S1) 577-583 1989

    DOI: 10.3379/jmsjmag.13.S1_577  

    More details Close

    PMRC 1989, JST.JSTAGE/jmsjmag/13.S1_577

  318. INFLUENCE OF LOCAL ANISOTROPY FLUCTUATION ON SOFT MAGNETIC-PROPERTIES OF THE SPUTTERED FE-SI-AL ALLOY-FILMS Peer-reviewed

    M TAKAHASHI, N KATO, T SHIMATSU, H SHOJI, T WAKIYAMA

    IEEE TRANSACTIONS ON MAGNETICS 24 (6) 3084-3086 1988/11

    DOI: 10.1109/20.92342  

    ISSN: 0018-9464

  319. Local Anisotropy Fluctuation on the Permeability of Sputtered Sandiest Alloy Films Peer-reviewed

    M. Takahashi, N. Kato, T. Shimatsu, H. Syoji, T. Wakiyama

    Journal of the Magnetics Society of Japan 12 (2) 305-310 1988/04

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.12.305  

    ISSN: 0285-0192

    More details Close

    Precise concentration dependence of μeff in films was clarified in a concentration area around bulk Sendust alloy. The dynamic differential susceptibility measurement proposed by H. Hoffmann was applied to the same films to evaluate the magnetic inhomogeneities normally represented as magnetic skew and ripple. Influence of the local magnetic anisotropy on μeff of the films is discussed in detail. To realize excellent soft magnetic properties, especially at high frequency, a high degree of preferred orientation of grains or of random orientation of grains is suggested.

  320. Effect of Local Anisotropy Fluctuation on the Permeability of Multilayered Co-Zr-Mo-Ni Amorphous Films

    M. Takahashi, T. Shimatsu, Y. Shimada, T. Wakiyama

    IEEE Translation Journal on Magnetics in Japan 3 (2) 166-172 1988

    DOI: 10.1109/TJMJ.1988.4563664  

    ISSN: 0882-4959

  321. SOFT MAGNETIC PROPERTIES OF Fe-Al-Si AND Fe-Ni-Nb SPUTTERED ALLOY FILMS

    TAKAHASHI Migaku, SATO Takenobu, SHIMATSU Takehito, TAKAHASHI Minoru

    ITE Technical Report 12 (26) 1-10 1988

    Publisher: The Institute of Image Information and Television Engineers

    DOI: 10.11485/tvtr.12.26_1  

  322. Effect of Local Anisotropy Fluctuation on the Permeability of Fe-Si-Al Sputtered Films Peer-reviewed

    M. Takahashi, T. Shimatsu, H. Shoji, T. Wakiyama, N. Kato

    IEEE Translation Journal on Magnetics in Japan 3 (7) 593-594 1988

    DOI: 10.1109/TJMJ.1988.4563805  

    ISSN: 0882-4959

  323. Effect of Local Anisotropy Fluctuation on the Permeability of Multilayered CoZrMoNi Amorphous Films Peer-reviewed

    M. Takahashi, T. Shimatsu, Y. Shimada, T. Wakiyama

    Journal of the Magnetics Society of Japan 11 (2) 275-278 1987/03

    Publisher: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.11.275  

    ISSN: 0285-0192

    More details Close

    To evaluate the magnetic inhomogeneities normally represented as magnetic skew and ripple, a systematic experimental investigation was carried out using the dynamic differential susceptibility measurement proposed by H. Hoffmann for multilayered Co79Zr10Mo9Ni2 amorphous films. Influence of the local magnetic anisotropy on the effective permeability, μeff, of the films is broadly discussed in connection with the magnetic skew and ripple. The magnitude of the μeff at the low frequency region less than 1 MHz is strongly dependent on the degree of the long period fluctuation of the local magnetization (skew) and the magnitude of the anisotropy field. To realize excellent soft magnetic properties in films at high frequency (10 MHz), it is suggested that the decrement of the magnetic inhomogeneities due to the short period fluctuation of the local magnetization are important.

  324. The effect of the local anisotropy fluctuation on the permeability for multilayered Co-Zr-Mo-Ni amorphous films Peer-reviewed

    M. Takahashi, T. Shimatsu, Y. Shimada, T. Wakiyama

    Proceedings of the International Symposium on Physics of Magnetic Materials (World Scientific Publishing Co Pte Ltd.) 134-137 1987

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    電気学会研究会資料. EFM 2019 (1) 33-36 2019/03/08

    Publisher: 電気学会

  12. マイクロ波アシスト磁気記録における磁化反転機構 (マグネティックス 電子材料合同研究会 光記録・磁気記録・一般)

    岡本 聡, 菊池 伸明, 北上 修, 島津 武仁

    電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan 2019 (14) 33-36 2019/03/08

    Publisher: 電気学会

  13. Low Temperature Bonding for 3D Integration FOREWORD

    Tadatomo Suga, Naoteru Shigekawa, Eiji Higurashi, Takehito Shimatsu, Masakazu Sugiyama, Hideki Takagi, Noriaki Toyoda

    JAPANESE JOURNAL OF APPLIED PHYSICS 57 (2) 2018/02

    DOI: 10.7567/JJAP.57.02B001  

    ISSN: 0021-4922

    eISSN: 1347-4065

  14. Magnetization switching in a dipolar coupled magnetic nanodot under the assistance of microwave field

    金原 大樹, 岡本 聡, 菊池 伸明, 北上 修, 島津 武仁

    電気学会研究会資料. MAG = The papers of technical meeting on magnetics, IEE Japan 2017 (138) 21-25 2017/11/16

    Publisher: 電気学会

  15. 高平均出力水の窓軟X線光源のための薄ディスクレーザーの開発

    東口武史, 山内駿, 篠崎夏美, 小倉拓人, 藤井雄介, 江島丈雄, 坂上和之, 魚本幸, 島津武仁, MOCEK Tomas

    応用物理学会秋季学術講演会講演予稿集(CD-ROM) 78th ROMBUNNO.5p‐S44‐7-1594 2017/08/25

    Publisher: The Japan Society of Applied Physics

    DOI: 10.11470/jsapmeeting.2017.2.0_1594  

    eISSN: 2436-7613

  16. Room Temperature Bonding of Al alloys and Cu in Air using Thin Au Films

    26 339-342 2016/09/08

    Publisher: エレクトロニクス実装学会

  17. Room Temperature Bonding of Al alloys and Stainless Alloys in Air using Thin Au Films

    26 335-338 2016/09/08

    Publisher: エレクトロニクス実装学会

  18. Room Temperature Bonding of Ceramics and Other Materials Using Thin Metal Films

    Takehito SHIMATSU, Miyuki UOMOTO

    CERAMICS JAPAN 51 (2) 91-93 2016/02/01

    Publisher: BULLETIN OF CERAMIC SOCIETY OF JAPAN

    ISSN: 0009-031X

  19. Industry-University Collaboration for "Mono-Zukuri"

    島津 武仁

    Journal of The Japan Institute of Electronics Packaging 18 (7) P7-P7 2015/11/01

    Publisher: (社)エレクトロニクス実装学会

    DOI: 10.5104/jiep.18.P7  

    ISSN: 1343-9677

  20. Room Temperature Bonding of Fe using Au Films in Air

    25 289-292 2015/09/03

    Publisher: エレクトロニクス実装学会

  21. A Theoretical Study of Thermally Activated Magnetization Switching under Microwave Assistance Peer-reviewed

    H. Suto, K. Kudo, T. Nagasawa, T. Kanao, K. Mizushima, R. Sato, S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG) 2015

  22. Room Temperature Bonding of Wafers using a-Si and a-Ge Films

    23 265-268 2013/09/12

    Publisher: エレクトロニクス実装学会

  23. Room Temperature Bonding of Wafers and Metals using Au Films in Air

    23 143-146 2013/09/12

    Publisher: エレクトロニクス実装学会

  24. Room Temperature Bonding of Wafers with Thin Nanocrystalline Metal Films and Its Application to Devices Fabrication

    Takehito SHIMATSU, Miyuki UOMOTO

    The Japan Society for Precision Engineering 79 (8) 710-713 2013/08/01

    Publisher: The Japan Society for Precision Engineering

    DOI: 10.2493/jjspe.79.710  

    ISSN: 0912-0289

  25. 原子拡散接合法によるウエハ室温接合技術とエタロンフィルタへの応用

    島津 武仁, 魚本 幸, 今 一恵, 若林 小太郎, 大場 健司, 古堅 由紀子

    OPTRONICS 32 (7) 88-92 2013/07/01

    Publisher: (株)オプトロニクス社

    ISSN: 0286-9659

  26. C-7-2 A Study on Write Margin of BPM

    Shirahata Kazuki, Saga Hideki, Miura Kenji, Shimatsu Takehito, Aoi Hajime, Muraoka Hiroaki

    Proceedings of the IEICE General Conference 2011 (2) 20-20 2011/02/28

    Publisher: The Institute of Electronics, Information and Communication Engineers

  27. 金属薄膜を用いた原子拡散接合の開発

    島津 武仁, 魚本 幸

    Materia Japan 49 (11) 521-527 2010/11/01

    Publisher: The Japan Institute of Metals and Materials

    DOI: 10.2320/materia.49.521  

    ISSN: 1340-2625

  28. 新しい積層構造を用いた超高密度垂直磁気記録媒体

    島津 武仁, 青井 基, 北上 修

    Materia Japan 47 (5) 249-255 2008/05

    Publisher: The Japan Institute of Metals and Materials

    DOI: 10.2320/materia.47.249  

    ISSN: 1340-2625

  29. 垂直磁気記録媒体の課題と最近の研究動向

    島津 武仁

    トライボロジスト 52 (6) 400-405 2007/06

    Publisher: (社)トライボロジー学会

  30. パルス磁界VSMによる磁気記録媒体の磁化機構の評価 ~磁化の熱擾乱の影響を差し引くことで何がわかるのか?~

    島津 武仁, 青井 基

    Magnetics Japan 2 (1) 20-27 2007/01

    Publisher: The Magnetics Society of Japan

    ISSN: 1880-7208

  31. Microstructure and Magnetic Anisotropy of CoPtCr-SiO_2 Perpendicular Recording Media Evaluated by Synchrotron Radiation X-ray Diffraction Method and Transmission Electron Microscope

    KUBOKI Y., OHSAWA M., TANUMA R., KUBO T., OIKAWA T., UWAZUMI H., SHIMATSU T.

    28 162-162 2004/09/21

  32. Annealing temperature dependence of K_u of CoPtCr/(Ru, Pt) films used for perpendicular recording media

    SHIMATSU T., MITSUZUKA K., SATO H., WATANABE I., MURAOKA H., AOI H., NAKAMURA Y.

    28 496-496 2004/09/21

  33. Preliminary study on Hard/Soft-stacked perpendicular recording media

    INABA Y., SHIMATSU T., KITAKAMI O., SATO H., OIKAWA T., MURAOKA H., AOI H., NAKAMURA Y.

    28 21-21 2004/09/21

  34. SiO_2 contents to enhance grain isolation in CoPtCr-SiO_2/Ru perpendicular recording media

    OIKAWA T., SHIMATSU T., INABA Y., WATANABE I., AOI H., MURAOKA H., NAKAMURA Y.

    28 165-165 2004/09/21

  35. K_<u2> effect in CoPtCr-SiO_2 perpendicular recording media : Media design

    SHIMATSU T., SATO H., OIKAWA T., INABA Y., MURAOKA H., AOI H., NAKAMURA Y.

    28 164-164 2004/09/21

  36. K_<u2> effect in CoPtCr-SiO_2 perpendicular recording media : Magnetic anisotropy

    SATO H., SHIMATSU T., MITSUZUKA K., KITAKAMI O., OKAMOTO S., MURAOKA H., AOI H., NAKAMURA Y.

    28 163-163 2004/09/21

  37. 28aXR-2 Magnetic moment distribution of the Pt cap layer in FeCo/Pt bilayers

    Suzuki M, Miyagawa H, Kawamura N, Muraoka H, Shimatsu T, Inaba Y, Katada H

    Meeting abstracts of the Physical Society of Japan 59 (1) 484-484 2004/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  38. Continuous Sheet Composed From Soft Magnetic Materials For Micro Inductors

    SUGAWARA E., ONO T., SHIRAKAWA K., SHIMATSU T., MASUMOTO T., NAKAMURA Y.

    27 188-188 2003/09/01

    ISSN: 1340-8100

  39. Evaluation of read-resolution using fabricated head-sliders for cylindrical magnetic media

    YAMADA H., SHIMATSU T., WATANABE I., AOI H., MURAOKA H., NAKAMURA Y.

    27 95-95 2003/09/01

    ISSN: 1340-8100

  40. K_<u2> effect in CoPtCr-SiO_2/Ru perpendicular recording media

    SHIMATSU T., OIKAWA T., KITAKAMI O., OKAMOTO S., MURAOKA H., AOI H., NAKAMURA Y.

    27 526-526 2003/09/01

    ISSN: 1340-8100

  41. Pt, Cr composition to derive high thermal stability in CoPtCr-SiO_2/Ru perpendicular recording media

    OIKAWA T., SHIMATSU T., INABA Y., SATO H., WATANABE I., MURAOKA H., AOI H., NAKAMURA Y.

    27 529-529 2003/09/01

    ISSN: 1340-8100

  42. SiO_2 composition to derive high density recording in CoPtCr-SiO_2/Ru perpendicular recording media

    INABA Y., SHIMATSU T., OIKAWA T., SATO H., WATANABE I., MURAOKA H., AOI H., NAKAMURA Y.

    27 528-528 2003/09/01

    ISSN: 1340-8100

  43. High perpendicular magnetic anisotropy in CoPtCr(-SiO_2)/Ru perpendicular films

    SHIMATSU T., SATO H., OIKAWA T., INABA Y., KITAKAMI O., OKAMOTO S., MURAOKA H., AOI H., NAKAMURA Y.

    27 527-527 2003/09/01

    ISSN: 1340-8100

  44. Magnetic moment of the Pt cap layer in Pt/Co bilayers

    Suzuki M., Miyagawa H., Kawamura N., Muraoka H., Shimatsu T., Inaba Y., Sonobe Y., Maruyama H., Isohama Y., Nakamura N., Ishimatsu N.

    Meeting abstracts of the Physical Society of Japan 58 (1) 474-474 2003/03/06

    Publisher: The Physical Society of Japan (JPS)

    ISSN: 1342-8349

  45. Magnetic cluster size and hysteresis loop in perpendicular recording media

    Proceedings of the IEICE General Conference 2003 (2) 19-19 2003/03/03

    Publisher: The Institute of Electronics, Information and Communication Engineers

  46. Effect of magnetic cluster size on the slope of magnetization curve for perpendicular recording media

    SHIMATSU T., UWAZUMI H., OIKAWA T., INABA Y., MURAOKA H., NAKAMURA Y.

    26 140-140 2002/09/01

    ISSN: 1340-8100

  47. Microstructure and magnetic properties of CoPtCr-SiO_2 perpendicular recording media

    OIKAWA T., UWAZUMI H., SHIMATSU T., MURAOKA H., NAKAMURA Y.

    26 139-139 2002/09/01

    ISSN: 1340-8100

  48. Soft magnetism of FeCo/NiFe(Cr) films with high saturation magnetization

    KATADA H., SHIMATSU T., WATANABE I., MURAOKA H., NAKAMURA Y.

    26 263-263 2002/09/01

    ISSN: 1340-8100

  49. Preliminary examination for cylindrical magnetic storage media measurement system

    YAMADA H., SHIMATSU T., WATANABE I., MURAOKA H., NAKAMURA Y.

    26 265-265 2002/09/01

    ISSN: 1340-8100

  50. The effect of Boron doping on the magnetic and R/W characteristics of Co/Pt superlattice perpendicular recording media

    SHIMATSU T., IGARI T., TERAKAWA M., WATANABE I., MURAOKA H., NAKAMURA Y.

    26 296-296 2002/09/01

    ISSN: 1340-8100

  51. Interlayer coupling and domain structure for SUL of perpendicular recording media

    SHIMATSU T., HONMA K., WATANABE I., MURAOKA H., NAKAMURA Y.

    26 160-160 2002/09/01

    ISSN: 1340-8100

  52. ACTIVATION VOLUME AND MEDIUM NOISE IN PERPENDICULAR RECORDING MEDIA

    Shimatsu Takehito, Uwazumi Hiroyuki, Muraoka Hiroaki, Nakamura Yoshihisa

    Proceedings of the IEICE General Conference 2002 (2) 160-160 2002/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  53. 垂直磁気記録媒体の磁化の熱擾乱と低ノイズ化―パルス磁界を用いた磁留磁化曲線の解析

    島津 武仁, 上住 洋之, 村岡 裕明, 中村 慶久

    日本応用磁気学会誌 26 (3) 109-117 2002/03

    Publisher: (社)日本応用磁気学会

    ISSN: 0285-0192

    More details Close

    The effect of thermal agitation of magnetization on the magnetic properties of perpendicular recording media was studied, using a pulse magnetometer. In media with well-segregated grains, it was found that the angular dependence of the "intrinsic" remanence coercivity H_0, obtained by subtracting the thermal agitation of magnetization, was nearly the same as that of coherent switching of magnetization, calculated by taking account of the angular distribution of the preferred axis. Superlattice media and amorphous/ granular composite media show qualitatively similar angular dependence of H_0 to that of CoCr-based media. Experimental analyses suggested that the value of the perpendicular anisotropy K_u has to be more than 3 times larger than that of 2πM^2_s in order to achieve an M_r/M_s of nearly 1.0 and thus resist thermal agitation. The media noise showed a clear relation to the activation volume and the strength of intergranular exchange coupling, indicating that they must be reduced to improve the media noise performance.

  54. Uniaxial anisotropy field and microstructure in very thin soft magnetic films

    KATADA H., SHIMATSU T., WATANABE H., WATANABE I., MURAOKA H., NAKAMURA Y., SUGITA Y.

    25 63-63 2001/09/01

    ISSN: 1340-8100

  55. Switching mechanism of CoTb/CoCrPt composite perpendicular media

    UWAZUMI H., SHIMATSU T., SAKAI Y., MURAOKA H., NAKAMURA Y.

    25 16-16 2001/09/01

    ISSN: 1340-8100

  56. Magnetization reversal and thermal stability of perpendicular recording media

    SHIMATSU T., UWAZUMI H., MURAOKA H., NAKAMURA Y.

    25 17-17 2001/09/01

    ISSN: 1340-8100

  57. Thickness dependence of R/W performance of CoTb/CoCrPt composite perpendicular media

    SAKAI Y., UWAZUMI H., SHIMATSU T., ENOMOTO K., TAKENOIRI S., WATANABE S., OHKUBO K., MURAOKA H., NAKAMURA Y.

    25 138-138 2001/09/01

    ISSN: 1340-8100

  58. Initial growth layer and magnetic properties of CoCrPt perpendicular media

    UWAZUMI H., SHIMATSU T., TERAKAWA M., SAKAI Y., TAKENOIRI S., WATANABE S., MURAOKA H., NAKAMURA Y.

    25 131-131 2001/09/01

    ISSN: 1340-8100

  59. High thermal stability and media noise in CoPrTb/CoCrTa composite perpendicular recording media

    SHIMATSU T., MURAOKA H., SATODATE Y., MURAMATSU K., WATANABE I., NAKAMURA Y.

    25 134-134 2001/09/01

    ISSN: 1340-8100

  60. Magnetic anisotropy and thermal stability in Co/Pd perpendicular magnetic films

    SHIMATSU T., TERAKAWA M., WATANABE I., MURAOKA H., NAKAMURA Y.

    25 413-413 2001/09/01

    ISSN: 1340-8100

  61. Soft magnetic properties and microstructure of NiFe/FeCo/NiFe films

    KATADA H., SHIMATSU T., WATANABE I., MURAOKA H., NAKAMURA Y.

    25 292-292 2001/09/01

    ISSN: 1340-8100

  62. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media (vol 36, pg 2375, 2000)

    T Shimatsu, SJ Greaves, K Muramatsu, Watanabe, I, H Muraoka, Y Sugita, Y Nakamura

    IEEE TRANSACTIONS ON MAGNETICS 37 (4) 3081-3081 2001/07

    ISSN: 0018-9464

  63. Erratum: Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media (IEEE Transactions on Magnetics (Sept. 2000) 36 (2375-2377))

    T. Shimatsu, S. J. Greaves, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE Transactions on Magnetics 37 3081 2001/07/01

    DOI: 10.1109/TMAG.2001.947073  

    ISSN: 0018-9464

  64. Angular Dependence of Remanence Coercivity of Perpendicular Recording Media Obtained by Subtracting Thermal Agitation of Magnetization

    SHIMATSU T., UWAZUMI H., MURAOKA H., NAKAMURA Y.

    IEICE technical report. Magnetic recording 100 (337) 37-42 2000/10/05

    Publisher: The Institute of Electronics, Information and Communication Engineers

    ISSN: 0913-5685

    More details Close

    The effect of thermal agitation of magnetization on the magnetic properties of CoCrTa perpendicular media was studied by using a pulse magnetometer, and the angular dependence of the "intrinsic" remanence coercivity H_o, obtained by subtracting the thermal agitation of magnetization, was discussed. The angular dependence of H_o was found to be nearly the same as that of coherent switching of magnetization calculated by taking into account of the angular distribution of the preferred axis. The ratio of magnetic energy to thermal energy, K_uV/kT, was found to be angular dependent, and shows a broad minimum value at the angle of 〜60°from the normal direction to the film plane.

  65. Uniaxial anisotropy field in very thin soft magnetic films

    KATADA H., SHIMATSU T., WATANABE I., MURAOKA H., NAKAMURA Y., SUGITA Y.

    24 95-95 2000/09/01

    ISSN: 1340-8100

  66. Thermal agitation of magnetization of perpendicular recording media

    SHIMATSU T., MURAMATSU K., YOSHIDA R., WATANABE I., MURAOKA H., NAKAMURA Y.

    24 282-282 2000/09/01

    ISSN: 1340-8100

  67. Thermal agitation of magnetization of CoCrPt-(Ta,B) perpendicular media

    SHIMATSU T., UWAZUMI H., SAKAI Y., OTSUKI A., MURAMATSU K., WATANABE I., MURAOKA H., NAKAMURA Y.

    24 280-280 2000/09/01

    ISSN: 1340-8100

  68. Recording performances of CoCrPt-(Ta,B) perpendicular media

    UWAZUMI H., SHIMATSU T., SAKAI Y., OTSUKI A., YOSHIDA R., WATANABE I., MURAOKA H., NAKAMURA Y.

    24 281-281 2000/09/01

    ISSN: 1340-8100

  69. Induced uniaxial magnetic anisotropy in thin Permalloy films

    Katada H., Shimatsu T., Watanabe I., Muraoka H., Nakamura Y., Sugita Y.

    Proceedings of the IEICE General Conference 2000 (2) 21-21 2000/03/07

    Publisher: The Institute of Electronics, Information and Communication Engineers

  70. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media

    T. Shimatsu, S. J. Greaves, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    Digests of the Intermag Conference 2000/01/01

    ISSN: 0074-6843

  71. Magnetic properties and recording performances in doubl-layerd CoCrTa/Ti/M perpendicular media

    SHIMATSU T., KOMAGOME H., MURAMATSU K., WATANABE I., MURAOKA H., SUGITA Y., NAKAMURA Y.

    23 34-34 1999/10/01

  72. Effect of underlayer on recording performances in double -layerd CoCrTa/Ti/M perpendicular media

    KOMAGOME H., SHIMATSU T., YOSHIDA R., WATANABE I., MURAOKA H., SUGITA Y., NAKAMURA Y.

    23 35-35 1999/10/01

  73. Thickness dependence of induced magnetic anisotropy in Ta/Ni_<79>Fe_<21>/Ta films

    KATADA H., SHIMATSU T., WATANABE I., MURAOKA H., NAKAMURA Y., SUGITA Y.

    23 380-380 1999/10/01

  74. Bonding of metal thin films during sputter film deposition

    SHIMATSU T., MOLLEMA R. H., MONSMA D., KEIM E. G., LODDER J. C.

    22 411-411 1998/09/01

  75. Thermal fluctuation of magnetization in FePt nanocrystalline thin films

    SHIMATSU T., LODDER J. C., SUGITA Y., NAKAMURA Y.

    22 350-350 1998/09/01

  76. Effect of Ti intermediate layer on magnetic properties in double-layered perpendicular media

    SULISTIO P., KOMAGOME H., SHIMATSU T., WATANABE I., MURAOKA H., SUGITA Y., NAKAMURA Y.

    22 492-492 1998/09/01

  77. Grain size reduction and recording performance in thin film media (Analysis of recorded magnetization pattern)

    SATO H., KIKUCHI A., NAKAI J., MITSUYA H., SHIMATSU T., TAKAHASHI M.

    20 209-209 1996/09/01

  78. Reverse dc erased noise and magnetized state (Noise properties in thin film media fabricated under Ultra clean sputtering process)

    YATSU A., KIKUCHI A., SHIMATSU T., TAKAHSHI M.

    20 211-211 1996/09/01

  79. Intergranular coupling in UC-processed thin film media (Temperature dependence of rotational hysteresis loss and simulation analysis)

    MITSUYA H., AKIMOTO H., OKAMOTO I., KIKUCHI A., NAKAI J., SHIMATSU T., TAKAHASHI M.

    20 213-213 1996/09/01

  80. CoCr based alloy thin film media fabricated under UC-process

    NAKAI J., KIKUCHI A., SHIMATSU T., TAKAHASHI M.

    20 214-214 1996/09/01

  81. Recording properties of thin film media fabrticated under UC-process and magnetization state (The analysis of transition region by magnetic force microscopy)

    HARA H., KIKUCHI A., SATO H., SHIMATSU T., TAKAHASHI M.

    20 210-210 1996/09/01

  82. Correlation between intergranular coupling and recording performance (Thin film media fabricated under ultra clean sputtering process)

    KIKUCHI A., NAKAI J., SHIMATSU T., TAKAHASHI M.

    20 212-212 1996/09/01

  83. Dependence of magnetic properties on magnetic layer thickness (Thin film media fabricated under ultra clean sputtering process)

    IWATA N., KIKUCHI A., NAKAI J., SHIMATSU T., TAKAHASHI M.

    20 215-215 1996/09/01

  84. Intergranular coupling in UC-processed thin film media(Temperature dependence of rotational hysteresis loss)

    SHIMATSU T., ENDO A., IWATA N., KIKUCHI A., NAKAI J., TAKAHASHI M.

    19 412-412 1995/09/01

  85. Ni-Fe thin films fabricatedunder XC-process(Microstructure and magnetic properties)

    OKUYAMA K., KUJI S., AOYAGI E., HAYASAKA Y., SHIMATSU T., TAKAHASHI M.

    19 382-382 1995/09/01

  86. Co_<78>Cr_<17>Ta_5/Cr thin film media fabricated under UC-process(Microstructure and magnetic properties)

    NAKAI J., KAWAKITA S., KIKUCHI A., HIRASAKA M., SHIMATSU T., TAKAHASHI M.

    19 408-408 1995/09/01

  87. Co_<78>Cr_<17>Ta_5/Cr thin film media fabricated under UC-process(Recording performance and magnetic microstructure)

    KIKUCHI A., NAKAI J., KAWAKITA S., MITSUYA H., SHIMATSU T., TAKAHASHI M.

    19 409-409 1995/09/01

  88. Construction of extremely clean sputtering system

    KUJI S., OKUYAMA K., SHIMATSU T., SHOJI H., TAKAHASHI M.

    19 383-383 1995/09/01

  89. Effect of substrate surface cleanness on magnetic properties(Dry-etching treatment in ultra clean sputtering process)

    KAWAKITA S., KIKUCHI A., NAKAI J., SHIMATSU T., TAKAHASHI M.

    19 407-407 1995/09/01

  90. Correlation between recording performance and microstructure(Thin film media fabricated under UC-process)

    KIKUCHI A, NAKAI J., KAWAKITA S., SATO H., SHIMATSU T., TAKAHASHI M.

    19 411-411 1995/09/01

  91. Co_<78>Cr_<17>Ta_5/Cr thin film media fabricated under UC-process(Effect of substrate bias on magnetic properties)

    NAKAI J., KIKUCHI A., KAWAKITA S., HIRASAKA M., SHIMATSU T., TAKAHASHI M.

    19 410-410 1995/09/01

  92. Effect of ultra clean sputtering process on magnetic anisotropy and intergranular coupling in CoNiCr and CoCrTa thin film recording media

    SHIMATSU T.

    The Proceedings of 14th ICMFS and E-MRS Joint Colloquium, Germany 213-214 1994

  93. SOFT MAGNETISM OF SPUTTERED FILMS WITH NANOCRYSTALS

    Migaku Takahashi, T.Shimatsu

    PROCEEDINGS OF THE 2nd INTERNATIONAL SYMPOSIUM ON PHYSICS OF MAGNETIC MATERIALS 1992(Beiging, China),INTERNATIONAL ACADEMIC PUBLISHERS 78-85 1992

  94. Magneto-Optical Effect in Fe-Ni, Ni-Co and Fe-Co Binary Alloy Films.

    T.Sato, T.Shimatsu, T.Miyahara, T.Miyazaki

    Proc. Magn.-Opt. Rec. 113-116 1991

  95. 1a-M1-2 Fe-Si-Alスパッタ薄膜の磁気的不均質性と軟磁性(磁性(薄膜・多層膜・人工格子))

    高橋 研, 島津 武仁, 荘司 弘樹, 脇山 徳雄

    年会講演予稿集 43 (3) 67-67 1988/03/18

    Publisher: 一般社団法人日本物理学会

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Books and Other Publications 2

  1. 異種材料一体化のための最新技術 ~溶接・接着剤・一体形成・加飾~

    森 邦夫, 金子大作, 三浦高行, 竹本 正, 安田清和, 須賀唯知, 島津武仁

    サイエンス&テクノロジー株式会社 2012/01/30

    ISBN: 9784864280365

  2. advanced Technologies of Perpendicular Magnetic Recording

    中村慶久, 村岡裕明, 沼澤潤二, 島津武仁

    シーエムシー出版 2007/07

Presentations 349

  1. Atomic Diffusion Bonding of Wafers with PDC-SiO2 underlayers using Thin Zr Films International-presentation

    M. Uomoto, T. Shimatsu, T. Goto, T. Hanasaki, K. Bando, Y. Suzuki, T. Saito

    WaferBond 2024 EAST 2024 8th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2024) 2024/11/01

  2. Atomic Diffusion Bonding using SiN films International-presentation

    A. Muraoka, K. Bando, Y. Suzuki, H. Makita, T. Saito, H. Fukunaga, M. Uomoto, T. Shimatsu

    WaferBond 2024 EAST 2024 8th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2024) 2024/11/01

  3. Bonding Potential of Atomic Diffusion Bonding of Wafers Using Oxide Films International-presentation Invited

    T. Shimatsu, M. Uomoto, A. Muraoka, K. Bando, Y. Suzuki, H. Makita, and T. Saito

    WaferBond 2024 EAST 2024 8th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2024) 2024/11/01

  4. Loading Pressure Effects on the Bonded Interface Structure in Atomic Diffusion Bonding Using Thick Au Films International-presentation

    K. Noguchi, M. Uomoto, T. Shimatsu

    WaferBond 2024 EAST 2024 8th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2024) 2024/10/31

  5. Blade Test to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding with Amorphous Si and Al Films International-presentation

    H. Iemura, M. Uomoto, T. Shimatsu

    WaferBond 2024 EAST 2024 8th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2024) 2024/10/30

  6. マイクロ波アシスト磁化反転と磁気的相互作用

    菊池伸明, 畑山正寿, 島津武仁, 岡本聡

    第48回日本磁気学会学術講演会 2024/09/25

  7. マイクロ波アシスト磁化反転と磁気的相互作用

    菊池伸明, 畑山正寿, 島津武仁, 岡本聡

    磁気記録・情報ストレージ研究会(MRIS) 2024/06/07

  8. Optimization of Ag Thin Film Thickness With a Capping Layer for Ag-Ag Surface Activated Bonding International-presentation

    Yuanhao Cai, Kai Takeuchi, Miyuki Uomoto, Takehito Shimatsu, Eiji Higurashi

    2024 International Conference on Electronics Packaging( ICEP 2024) 2024/04/18

  9. Suppression of surface roughening of Ag films by capping layer for Ag/Ag surface activated bonding International-presentation

    Yuanhao Cai, Kai Takeuchi, Miyuki Uomoto, Takehito Shimatsu, Eiji Higurashi

    12th IEEE CPMT Symposium Japan (ICSJ2023) 2023/11/16

  10. Blade Test in Atmospheric-Pressure Ar Gas to Characterize Bonded Interface Fabricated Using Atomic Diffusion Bonding International-presentation

    H. Iemura, F. Goto, M. Uomoto, T. Shimatsu

    244th ECS Meeting 2023/10/11

  11. Crystal Lattice Rearrangement Occurred at Au/Ag Bonded Interface in Atomic Diffusion Bonding in Vacuum International-presentation

    F. Goto, H. Iemura, M. Uomoto, T. Shimatsu

    244th ECS Meeting 2023/10/11

  12. Atomic Diffusion Bonding in Air using Oxide Films International-presentation

    T. Shimatsu, M. Uomoto, H. Fukunaga, H. Makita, Y. Suzuki, Y. Kozuka, A. Muraoka, T. Saito

    244th ECS Meeting 2023/10/11

  13. Preferred Grain Orientation to Enhance Interdiffusion at Room Temperature in Atomic Diffusion Bonding: A Fundamental Study using Ni and Cu Films International-presentation

    M. Uomoto, S. Kikuchi, F. Goto, T. Shimatsu

    244th ECS Meeting 2023/10/11

  14. マイクロ波アシスト磁化反転時のエネルギー障壁

    水谷聡志, 菊池伸明, 畑山正寿, 島津武仁, 岡本 聡

    第47回日本磁気学会学術講演会 2023/09/28

  15. Effect of film thickness on microwave assisted switching behavior

    Intermag 2023 2023/06/09

  16. Effect of film thickness on microwave assisted switching behavior International-presentation

    Nobuaki Kikuchi, Katsunari Sato, Masatoshi Hatayama, Takehito Shimatsu, Satoshi Okamoto

    Intermag 2023 2023/05/16

    More details Close

    AJ-08 (NOA-09)

  17. ブレード法によるウエハ接合強度の評価に及ぼす測定雰囲気の影響Ⅰ(金属薄膜を用いた原子拡散接合法による接合界面の評価)

    家村 光, 後藤 風輝, 魚本 幸, 島津 武仁

    第 37 回エレクトロニクス実装学会春季講演大会 2023/03/14

  18. ブレード法によるウエハ接合強度の評価に及ぼす測定雰囲気の影響Ⅱ(ZrO2薄膜を用いた原子拡散接合法による接合界面の評価)

    後藤 風輝, 家村 光, 魚本 幸, 島津 武仁

    第 37 回エレクトロニクス実装学会春季講演大会 2023/03/14

  19. マイクロ波アシスト磁化反転における熱活性の影響

    水谷聡志, 岡本聡

    2022年度 物質・デバイス領域共同研究拠点 展開共同研究 研究会 2023/03/14

  20. Atomic Diffusion Bonding using AlN Films with High Electrical Resistivity International-presentation

    WaferBond'22 Conference on Wafer Bonding for Microsystems, 3D- and Wafer Level Integration 2022/10/05

  21. Atomic Diffusion Bonding of Wafers using Various Oxide Films International-presentation Invited

    WaferBond'22 Conference on Wafer Bonding for Microsystems, 3D- and Wafer Level Integration 2022/10/05

  22. 磁性膜厚のマイクロ波アシスト磁化反転挙動への影響

    菊池 伸明, 佐藤 勝成, 畑山 正寿, 島津 武仁, 岡本 聡

    第46回日本磁気学会学術講演会 2022/09/08

  23. マイクロ波アシスト磁化反転における熱活性の影響

    水谷 聡志, 菊池 伸明, 畑山 正寿, 島津 武仁, 岡本 聡

    第46回日本磁気学会学術講演会 2022/09/08

  24. Cuを微量添加したAg薄膜を用いた大気中の原子拡散接合法における接合性能

    渡部 雄貴, 魚本 幸, 島津 武仁

    第32回マイクロエレクトロニクスシンポジウム MES2022 2022/09/06

  25. Microwave assisted switching in granular media with continuous capping layers for interaction control International-presentation

    Nobuaki Kikuchi, Katsunari Sato, Takehito Shimatsu, Osamu Kitakami, Satoshi Okamoto

    Magnetics and Optics Reresearch IInternational Symposium2022(MORIS2022) 2022/05/18

  26. THERMAL ACTIVATION ON MICROWAVE ASSISTED MAGNETIZATION SWITCHING IN Co/Pt NANODOT ARRAYS International-presentation

    Satoshi Mizutani, Nobuaki Kikuchi, Masatoshi Hatayama, Takehito Shimatsu, Satoshi Okamoto

    Magnetics and Optics Reresearch IInternational Symposium2022(MORIS2022) 2022/05/17

  27. Co/Ptナノドットを用いたマイクロ波アシスト磁化反転における熱活性の影響

    水谷聡志, 菊池伸明, 畑山正寿, 島津武仁, 岡本聡

    2021年度 物質・デバイス領域共同研究拠点展開共同研究B 研究会 2021/12/28

  28. Thermal activation on microwave assisted magnetization switching in Co/Pt nanodot arrays International-presentation

    S. Mizutani, N. Kikuchi, M. Hatayama, T. Shimatsu, S. Okamoto

    The 5th Symposium for core research clusters for materials Science and Spintronics, and the 4th Symposium on International Joint Graduate Program in Materials Science 2021/10/25

  29. Atomic Diffusion Bonding of Wafers with Oxide Underlayers using Thin Hf Films for Optical Applications International-presentation

    G, Yonezawa, M. Uomoto, T. Shimatsu

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/07

  30. Atomic Diffusion Bonding using Y2O3 and ZrO2 films International-presentation

    T. Shimatsu, H. Yoshida, M. Uomoto, T. Saito, T. Moriwaki, N. Kato, Y. Miyamoto, K. Miyamoto

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/07

  31. Atomic Diffusion Bonding using AlN films International-presentation

    M. Uomoto, H. Yoshida, T. Shimatsu, T. Saito, T. Moriwaki, N. Kato, Y. Miyamoto, K. Miyamoto

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/07

  32. Surface Contamination Effects on Bonding Performance in Atomic Diffusion Bonding of Wafers using Amorphous Si Thin Films International-presentation

    T, Amino, M. Uomoto, T. Shimatsu

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/07

  33. Preliminary Study of Atomic Diffusion Bonding in Air using Ag films International-presentation

    Y. Watabe, F, Goto, M. Uomoto, T. Shimatsu

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/07

  34. Sputtering Technique to Fabricate Smooth Surface Oxide Film for Room Temperature Bonding International-presentation

    T. Saito, T. Hanasaki, T. Moriwaki, T. Goto, A. Takeda, A. Miura, M. Uomoto, T. Shimatsu

    WaferBond 2021 EAST 2021 7th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2021) 2021/10/05

  35. Co/Pt 多層膜ナノドットのマイクロ波アシスト磁化反転における熱活性

    水谷聡志, 菊池伸明, 畑山正寿, 島津武仁, 岡本 聡

    第45回日本磁気学会学術講演会 2021/08/31

  36. Co/Pt多層膜ナノドットのマイクロ波アシスト磁化反転における熱活性の影響

    水谷 聡志, 菊池 伸明, 畑山 正寿, 岡本 聡, 島津 武仁

    磁気記録・情報ストレージ研究会(MRIS) 2021/06/10

  37. 室温接合技術と接合面の平滑性・清浄度の重要性(原子拡散接合法を例に) Invited

    島津 武仁

    公益社団法人精密工学会 プラナリゼーションCMPとその応用技術専門委員会 第189回研究会 2021/04/26

  38. マイクロ波アシスト磁化反転における熱揺らぎの影響 Invited

    岡本 聡, 菊池 伸明, 島津 武仁

    スピントロニクス学術研究基盤と連携ネットワーク拠点 年次報告会 2021/03/09

  39. Effect of Field Angle on Microwave Assisted Magnetization Switching International-presentation

    Nobuaki KIKUCHI, Satoshi OKAMOTO, Takehito SHIMATSU

    The 4th International Symposium for The Core Research Cluster for Spintronics 2021/02/24

  40. Microwave-Assisted Magnetization Switching Behaviors in Granular Media International-presentation Invited

    S. Okamoto, N. Kikuchi, T. Shimatsu

    The 31st Magnetic Recording Conference (TMRC 2020) 2020/08/19

  41. GHz帯の高周波磁場により励起された磁化ダイナミクス

    菊池 伸明, 岡本 聡, 島津 武仁

    Spin-RNJ 若手オンライン研究発表会 2020/06/04

  42. Ag薄膜を用いた原子拡散接合法による光学機能性接合界面の形成

    村岡 有菜, 魚本 幸, 島津 武仁

    第34回エレクトロニクス実装学会春季講演大会 2020/03/03

  43. 薄いTi薄膜を用いた原子拡散接合法における成膜後の真空中保持時間と接合強度

    網野 泰知郎, 魚本 幸, 島津 武仁

    第34回エレクトロニクス実装学会春季講演大会 2020/03/03

  44. 薄いZr薄膜を用いた原子拡散接合法によるウエハ室温接合

    魚本 幸, 島津 武仁

    第34回エレクトロニクス実装学会春季講演大会 2020/03/03

  45. Atomic Diffusion Bonding of Wafers in Air using Thin Pt Films International-presentation

    T. Shimatsu

    The International Conference on Wafer Bonding, WaferBond '19 2019/12/02

  46. 原子拡散接合法による室温接合技術と接合面の表面粗さ Invited

    島津 武仁

    第4回 AFM&CSIソリューションセミナー 2019/11/20

  47. CoCrPtグラニュラ薄膜における粒子間交換結合のマイクロ波アシスト磁化反転への影響

    佐藤 勝成, 菊池 伸明, 岡本 聡, 北上 修, 島津 武仁

    第43回日本磁気学会学術講演会 2019/09/25

  48. 原子拡散接合によるGaN-on-GaN HEMT高放熱特性

    岡本 直哉, 美濃浦 優一, 魚本 幸, 島津 武仁

    第80回応用物理学会秋季学術講演会 2019/09/18

  49. Microwave Assisted Switching on CoPtCr-Based Granular Media International-presentation Invited

    N. Kikuchi, K. Sato, S. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    Magnetics and Optics Research International Symposium(MORIS 2019) 2019/06/23

  50. CoCrPtグラニュラ記録媒体のマイクロ波アシスト磁化反転実験

    佐藤 勝成, 菊池 伸明, 岡本 聡, 北上 修, 島津 武仁

    磁気記録・情報ストレージ研究会(MRIS) 2019/06/13

  51. 原子拡散接合ー表面活性化接合の新潮流とその応用 Invited

    島津 武仁

    一般社団法人電子実装工学研究所 総会 2019/06/11

  52. Temporary SiC-SiC wafer bonding compatible with high temperature annealing International-presentation

    Fengwen Mu, Tadatomo Suga, Miyuki Uomoto, Takehito Shimatsu

    The 69th IEEE Electronic Components and Technology Conference(ECTC 2019) 2019/05/28

  53. SiC-SiC temporary bonding compatible with rapid thermal annealing at 1000 ℃ International-presentation

    Fengwen Mu, Tadatomo Suga, Miyuki Uomoto, Takehito Shimatsu, Kenichi Iguchi, Haruo Nakazawa

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  54. Novel Gratings for Astronomical Observations Fabricated by Latest Technologies International-presentation

    N. Ebizuka, T. Okamoto, M. Sasaki, I. Tanaka, M. Uomoto, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  55. Rearrangement of Crystal Lattice Occurred at Ag/Ag Bonded Interface in Atomic Diffusion Bonding International-presentation

    S. Matsuda, M. Uomoto, A. Miura, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  56. Atomic Diffusion Bonding of Wafers using a-Ge Films with Extremely Low Electrical Conductivity International-presentation

    A. Muraoka, M. Uomoto, M. Abe, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  57. Atomic Diffusion Bonding of Wafers Using Thin Nb Films International-presentation

    M. Uomoto, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  58. Novel Sputter Film Deposition to Fabricate Thick Films with Extremely Smooth Surface Suitable for Room Temperature Bonding International-presentation

    T. Saito, H. Makita, T. Moriwaki, Y. Suzuki, N. Kato, S. Wakayanagi, A. Miura, M. Uomoto, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  59. Oxidation of Bonded Thin Ti Films Using Oxide Underlayers in Atomic Diffusion Bonding Process for Optical Applications International-presentation

    G. Yonezawa, Y. Sato, S. Abe, M. Uomoto, T. Shimatsu

    WaferBond 2019 EAST 2019 6th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2019) 2019/05/21

  60. 薄いa-Ge及びa-Si薄膜を用いた原子拡散接合法によるウエハ室温接合

    村岡 有菜, 魚本 幸, 島津 武仁

    第33回エレクトロニクス実装学会春季講演大会 2019/03/11

  61. 原子拡散接合で作製したInGaAs/a-Ge/InGaAs接合部のバンド構造評価

    山田 友輝, 魚本 幸, 島津 武仁, 名田 允洋, 中島 史人, 松崎 秀昭

    第66回応用物理学会春季学術講演会 2019/03/09

  62. Atomic Diffusion Bonding: Room Temperature Bonding of Wafers for Creating the Future of Electronic and Optical Devices International-presentation Invited

    Takehito Shimatsu

    3D & SYSTEMS SUMMIT 2019/01/28

  63. 原子拡散接合量産装置と接合周辺技術の開発 Invited

    森脇 崇行, 齋藤 孝之, 牧田 裕之, 鈴木 雄大, 魚本 幸, 島津 武仁

    2018年日本表面真空学会学術講演会 2018/11/19

  64. Suprious-Free, Near-Zero-TCF Hetero Acoustic Layer (HAL)SAW Resonators Using LiTaO3Thin Plate on Quartz International-presentation

    Michio Kadota, Yoshimi Ishii Yunoki, Takehito Shimatsu, Miyuki Uomoto, Shuji Tanaka

    2018 IEEE International Ultrasonics Symposium (IUS) 2018/10/25

  65. Atomic Diffusion Bonding for Optical Devices with High Optical Density International-presentation

    G. Yonezawa, Y. Takahashi, Y. Sato, S. Abe, M. Uomoto, T. Shimatsu

    AiMES 2018 ECS and SMEQ Joint International Meeting 2018/09/30

  66. Room Temperature Bonding of Wafers Using Si and Ge Films with Extremely Low Electrical Conductivity International-presentation

    M. Uomoto, A. Muraoka, T. Shimatsu

    AiMES 2018 ECS and SMEQ Joint International Meeting 2018/09/30

  67. 酸化下地膜を用いた原子拡散接合法による高光透過率の接合界面の形成と光学部品への応用

    米澤 元, 高橋 祐一, 佐藤 能久, 阿部 昇平, 魚本 幸, 島津 武仁

    日本学術振興会産学協力研究委員会 接合界面創成技術第191委員会 第18回研究会 2018/09/14

  68. CoCrPt グラニュラ磁気記録媒体におけるマイクロ波アシスト効果の時間依存性

    菊地 瞬, 島津武仁, 菊池伸明, 岡本 聡, 北上 修

    第42回日本磁気学会学術講演会 2018/09/11

  69. 連続波を用いたCoCrPt グラニュラ記録媒体のマイクロ波アシスト磁化反転実験

    佐藤勝成, 菊池伸明, 岡本 聡, 北上 修, 島津武仁

    第42回日本磁気学会学術講演会 2018/09/11

  70. Microwave assisted switching on CoCrPt based granular media Invited

    N. Kikuchi, K. Shimada, S. Kikuchi, K. Sato, S. Okamoto, O. Kitakami, T. Shimatsu

    第42回日本磁気学会学術講演会 2018/09/11

  71. 積層磁性体ドットにおけるマイクロ波アシスト磁化反転

    金原大樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    平成30年電気学会 基礎・材料・共通部門大会 2018/09/04

  72. Microwave assisted switching behavior of CoCrPt based granular media International-presentation Invited

    N. Kikuchi, K. Shimada, S. Kikuchi, K. Sato, S. Okamoto, O. Kitakami, T. Shimatsu

    The 29th Magnetic Recording Conference (TMRC 2018) 2018/08/18

  73. Near-Zero TCF of HAL SAW Resonator with LiTaO3-on-Quartz Structure International-presentation

    Michio Kadota, Yoshimi Yunoki, Takehito Shimatsu, Miyuki Uomot, Shuji Tanaka

    2018 IEEE International Frequency Control Symposium (IFCS) 2018/05/21

  74. フォトダイオード構造を用いた原子拡散接合InGaAs/Ge/InGaAs界面の電子輸送特性評価

    山田 友輝, 魚本 幸, 島津 武仁, 名田 允洋, 中島 史人, 松崎 松崎

    第65回応用物理学会 春季学術講演会 2018/03/17

    More details Close

    奨18p-C302-13

  75. 積層磁性膜におけるマイクロ波アシスト磁化反転 Invited

    岡本 聡, Lu Yuming, 菊池伸明, 北上 修, 島津武仁

    平成30年電気学会全国大会 2018/03/14

  76. CoCrPt-TiO2グラニュラー薄膜におけるマイクロ波アシスト磁化反転挙動

    菊池伸明, 島田恭平, 島津武仁, 岡本聡, 北上修

    マグネティックス研究会 2018/03/09

  77. High Performance HAL SAW devices with Near-Zero TCF and High Quality International-presentation

    Michio Kadota, Yoshimi Yunoki, Takehito Shimatsu, Miyuki Uomoto, Shuji Tanaka

    Seventh International Symposium on Acoustic Wave Devices for Future Mobile Communication Systems 2018/03/06

  78. 高性能Hetero Acoustic Layer弾性表面波デバイス

    門田道雄, 柚木良美, 島津武仁, 魚本幸, 田中秀治

    圧電材料・デバイスシンポジウム2018 2018/02/05

  79. Frequency dependence of microwave-assisted switching in CoCrPt granular perpendicular media International-presentation

    Kyohei Shimada, Takehito Shimatsu, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami

    Magnetics and Optics Research International Symposium(MORIS 2018) 2018/01/07

  80. Elementally resolved ferromagnetic resonance by X-ray magnetic circular dichroism on Co/Pt multilayer dots International-presentation

    Nobuaki Kikuchi, Takahiro Yomogita, Daiki Kanahara, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu, Hitoshi Osawa, Yoshinori Kotani, Kentaro Toyoki, Motohiro Suzuki, Tetsuya Nakamura

    Magnetics and Optics Research International Symposium(MORIS 2018) 2018/01/07

  81. 薄い金属薄膜を用いたウエハの室温接合技術(原子拡散接合法) Invited

    島津武仁

    日本学術振興会 薄膜第131委員会 第281回委員会・第287回研究会 2017/12/19

  82. 硬X線MCDによるCo/Ptナノドットの時空間分解強磁性共鳴測定 (Time- and spatially resolved hard X-ray MCD-FMR measurement on a Co/Pt multilayer dot)

    菊池伸明, 蓬田貴裕, 金原大樹, 岡本聡, 北上修, 島津武仁, 大沢仁志, 鈴木基寛, N. Kikuchi, T. Yomogita, D. Kanahara, S. Okamoto, O. Kitakami, T. Shimatsu, H. Osawa, M. Suzuki

    平成29年度スピニクス研究会 2017/11/28

  83. Room Temperature Bonding of Wafers using Thin Metal Films for Optical Device Fabrications International-presentation

    T. Shimatsu

    The International Conference on Wafer Bonding, WaferBond '17 2017/11/27

  84. 双極子結合した積層磁性ドットによるマイクロ波アシスト実験

    金原大樹, 岡本聡, 菊池伸明, 北上修, 島津武仁

    マグネティクス研究会 2017/11/16

  85. Layer-selective switching in a dot of double AFC layers under the assistance of rf fields International-presentation

    Y. Lu, S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu

    MMM 2017 – 62nd Annual Conference on Magnetism and Magnetic Materials 2017/11/06

  86. Time- and spatially resolved hard X-ray MCD with pulsed rf field excitation on a Co/Pt multilayer dot International-presentation

    N. Kikuchi, T. Yomogita, D. Kanahara, S. Okamoto, O. Kitakami, T. Shimatsu, H. Osawa, M. Suzuki

    MMM 2017 – 62nd Annual Conference on Magnetism and Magnetic Materials 2017/11/06

  87. Layer-selective switching in a dot of double AFC layers under the assistance of rf fields International-presentation

    S. Okamoto, Y. Lu, N. Kikuchi, O. Kitakami, T. Shimatsu

    Junjiro Kanamori Memorial International Symposium 2017/09/27

  88. CoCrPt グラニュラ垂直磁気記録媒体におけるマイクロ波アシスト効果

    島田恭平, 島津武仁, 菊池伸明, 岡本 聡, 北上 修

    第41回日本磁気学会学術講演会(平成29年) 2017/09/19

  89. 積層磁性ドットによるマイクロ波アシスト磁化反転

    金原大樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    第41回日本磁気学会学術講演会(平成29年) 2017/09/19

  90. 高平均出力水の窓軟X線光源のための薄ディスクレーザーの開発

    東口 武史, 山内 駿, 篠崎 夏美, 小倉 拓人, 藤井 雄介, 江島 丈雄, 坂上 和之, 魚本 幸, 島津 武仁, MOCEK Tomas

    第78回応用物理学会秋季学術講演会 2017/09/05

  91. 原子拡散接合GaAsSb/InP-Ti-GaNヘテロ接合バイポーラトランジスタ

    星 拓也, 山田 友輝, 名田 允洋, 白鳥 悠太, 魚本 幸, 島津 武仁, 松崎 秀昭

    第78回応用物理学会秋季学術講演会 2017/09/05

  92. 原子拡散接合法による室温接合技術(技術ポテンシャルと応用) Invited

    島津武仁

    第3回 両国フォトニクスサロン 2017/09/01

  93. TUNING MAGNETIC ANISOTROPY AND CURIE TEMPERATURE OF L10-FePt GRANULAR FILMS International-presentation Invited

    Takehito SHIMATSU, Takuya ONO, Tomohiro MORIYA, Hitoshi NAKATA, Kazuya KOMIYAMA, Shinji UCHIDA, Hirohisa Oyama, Hiroto KIKUCHI, Hiroyasu KATAOKA, Kiminori SATO, Akira FURUTA, Tsuyoshi YOSHIZAWA, Masatoshi HATAYAMA, Kaoru TSUMURA, Nobuaki KIKUCHI, Osamu KITAKAMI

    The 28th Magnetic Recording Conference (TMRC 2017) 2017/08/02

  94. MAGNETIZATION SWITCHING OF A DOT COMPOSED OF DOUBLE AFC LAYERS UNDER THE ASSISTANCE OF RF FIELDS International-presentation

    Yuming LU, Satoshi OKAMOTO, Nobuaki KIKUCHI, Osamu KITAKAMI, Takehito SHIMATSU

    The 28th Magnetic Recording Conference (TMRC 2017) 2017/08/02

  95. 双極子結合した積層磁性ドットによるマイクロ波アシスト磁化反転

    金原 大樹, 岡本聡, 菊池伸明, 北上修, 島津武仁

    磁気記録・情報ストレージ研究会 2017/06/08

  96. Enhancement of Light Transmittance for Wafers Bonded with Thin Al Films Using Atomic Diffusion Bonding and Subsequent Laser Irradiation International-presentation

    M. Ichikawa, N. Eboshi, T. Kemmochi, M. Sano, T. Mukai, M. Uomoto, T. Shimatsu

    2017 5th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2017) 2017/05/16

  97. Shear Strength of Room-Temperature-Bonded Sapphire and Metal Substrates Using Au Films International-presentation

    H. Kon, M. Uomoto, N. Nakajima, T. Nakaya, T. Shimatsu

    2017 5th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2017) 2017/05/16

  98. Room Temperature Bonding of InGaAs Wafers Using Thin Ge Films International-presentation

    M. Uomoto, Y. Yamada, T Hoshi, M. Nada, T. Shimatsu

    2017 5th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2017) 2017/05/16

  99. Demonstration of laser oscillation of an Yb-doped Y2O3 composite disk by use of atomic diffusion bonding in room temperature International-presentation

    T. Higashiguchi, S. Yamauchi, Y. Fujii, N. Shinozaki, T. Ogura, M. Uomoto, T. Shimatsu, T. Miura, Tomáš Mocek

    2017 5th International Workshop on Low Temperature Bonding for 3D Integration(LTB-3D 2017) 2017/05/16

  100. 薄いAu薄膜を用いた金属とセラミクスの室温接合と接合性能

    魚本 幸, 阿部真帆, 島津武仁

    第31回エレクトロニクス実装学会春季講演大会 2017/03/06

  101. Room temperature Bonding using Thin Metal Films (Atomic Diffusion Bonding) International-presentation Invited

    Takehito Shimatsu

    2017 IEEE Electron Devices Technology and Manufacturing Conference(EDTM) 2017/02/28

  102. Transmission gratings and immersion gratings for instruments of Subaru Telescope and TMT International-presentation

    Ebizuka, N. Okamoto, T. Takeda, M. Hosobata, T. Yamagata, Y. Sasaki, M. Uomoto, M. Shimatsu, T. Sato, S. Hashimoto, N. Tanaka, I. Hattori, T. Ozaki, S. Aoki

    The 9th International Conference on Leading Edge Manufacturing in 21st Century (LEM21) 2017

  103. 積層磁性ドットによるマイクロ波アシスト磁化反転

    金原 大樹, 岡本 聡, 菊池 伸明, 北上 修, 島津 武仁

    平成 28 年度スピニクス特別研究会 2016/11/21

  104. Microwave assisted magnetization switching behaviors in a ferrimagnetic amorphous Gd-Fe-Co single dot International-presentation

    Y. Lu, S. Okamoto, N. Kikuchi, B. Lao, Y. Kusanagi, O. Kitakami, T. Shimatsu

    61st Annual Conference on Magnetism and Magnetic Materials 2016/10/31

  105. Ru addition into L10-FePt thin film to lower Tc for heat-assisted magnetic recording International-presentation

    T. Ono, H. Nakata, T. Moriya, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    61st Annual Conference on Magnetism and Magnetic Materials 2016/10/31

  106. Time resolved FMR measurement in non-linear regime on a Co/Pt multilayer dot measured by XMCD International-presentation

    N. kikuchi, T. Yomogita, D. Kanahara, S. Okamoto, O. Kitakaim, T. Shimatsu, H. Osawa, M. Suzuki

    61st Annual Conference on Magnetism and Magnetic Materials 2016/10/31

  107. Microwave-Assisted Magnetization Switching in Granular Media International-presentation Invited

    S. Okamoto, N. Kikuchi, B. Lao, Y. Kusanagi, Y. Lu, O. Kitakami, Y. Nakayama, A. Hotta, T. Shimatsu

    Advanced Storage Technology Consortium Fall 2016 Research Review Meeting 2016/10/12

  108. Room Temperature Boding of Solid Substrates using Thin Metal Films(Atomic Diffusion Bonding) International-presentation Invited

    Takehito Shimatsu, Miyuki Uomoto

    10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS) 2016/10/11

  109. High Output Power Deep Ultraviolet Light-Emitting Diodes with Hemispherical Lenses Fabricated Using Room-Temperature Bonding International-presentation Invited

    M. Ichikawa, S. Endo, H. Sagawa, A. Fujioka, T. Kosugi, T. Mukai, M. Uomoto, T. Shimatsu

    PRiME 2016/230th ECS Meeting 2016/10/02

  110. Necessary Thickness of Au Capping Layers for Room Temperature Bonding of Wafers in Air Using Thin Metal Films with Au Capping Layers International-presentation

    Miyuki Uomoto, Takehito Shimatsu

    PRiME 2016/230th ECS Meeting 2016/10/02

  111. Room temperature Bonding using Thin Metal Films: Technical Potential and Current Status International-presentation Invited

    Takehito Shimatsu

    2016 International Conference on Solid State Devices and Materials 2016/09/26

  112. 薄いAu薄膜を用いたアルミ合金とステンレス合金の大気中の室温接合

    魚本 幸, 阿部真帆, 島津武仁

    第26回マイクロエレクトロニクスシンポジウム秋季大会 MES2016 2016/09/08

  113. 薄いAu薄膜を用いたアルミ合金とCuの大気中の室温接合

    阿部真帆, 魚本 幸, 島津武仁

    第26回マイクロエレクトロニクスシンポジウム秋季大会 MES2016 2016/09/08

  114. 硬X線MCDによるCo/Ptドットの磁化ダイナミクスの時間分解測定

    菊池伸明, 蓬田貴裕, 金原大樹, 岡本聡, 北上修, 島津武仁, 大沢仁志, 鈴木基寛

    第40回日本磁気学会学術講演会(平成28年) 2016/09/05

  115. Microwave assisted switching and its application to 3D recording system International-presentation Invited

    N. Kikuchi, S. Okamoto, H. Suto, Y. Nakayama, O. Kitakami, K. Kudo, T. Nagasawa, T. Katnao, K. Mizushima, R. Sato, T. Shimatsu

    The 4th International Conference of Asian Union of Magnetic Societies 2016/08/01

  116. Novel diffraction gratings for next generation spectrographs with high spectral dispersion International-presentation

    N. Ebizuka, T. Okamoto, T. Hosobata, Y. Yamagata, M. Sasaki, M. Uomoto, T. Shimatsu, S. Sato, N. Hashimoto, I. Tanaka, T. Hattori, S. Ozaki, W. Aoki

    SPIE Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II 2016/06/26

  117. 薄いAu薄膜を用いた金属バルク材の室温接合と接合性能

    魚本 幸, 島津武仁

    第30回エレクトロニクス実装学会春季講演大会 2016/03/22

  118. 原子拡散接合で作製されたPIN-ダイオードの電気特性

    山田友輝, 魚本 幸, 島津武仁, 名田允洋, 松崎秀昭

    第63回応用物理学会春季学術講演会 2016/03/19

  119. 常温直接接合を用いた深紫外LEDの開発

    市川将嗣, 遠藤慎哉, 佐川治信, 向井孝志, 魚本 幸, 島津武仁

    日本学術振興会産学協力研究委員会 接合界面創成技術第191委員会第3回委員会・研究会 2016/02/17

  120. 原子拡散接合法によるウエハの室温接合技術とデバイス形成への応用 Invited

    島津武仁, 魚本 幸

    応用物理学会 薄膜・表面物理分科会 「第21回電子デバイス界面テクノロジー研究会」 2016/01/22

  121. Experimental investigation of off-stoichiometry and 3d-metal (Mn, Ni, Cu)-substitution in epitaxial FePt thin films. International-presentation

    T. Ono, H. Nakata, T. Moriya, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    13th Joint MMM/Intermag Conference 2016 2016/01/11

  122. Microwave assistance effect on magnetization switching in antiferromagnetically coupled CoCrPt granular media. International-presentation

    Y. Nakayama, Y. Kusanagi, T. Shimatsu, N. Kikuchi, S. Okamoto, O. Kitakami

    13th Joint MMM/Intermag Conference 2016 2016/01/11

  123. Detection of ferromagnetic resonance on Pt layers of a Co/Pt multilayer single dot by micro-XMCD magnetometry. International-presentation

    N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu, M. Suzuki

    13th Joint MMM/Intermag Conference 2016 2016/01/11

  124. Magnetic anisotropy and crystal domain variant in L10-FePt poly-crystalline films. International-presentation

    A. Hotta, T. Ono, T. Shimatsu, N. Kikuchi, S. Okamoto, O. Kitakami

    13th Joint MMM/Intermag Conference 2016 2016/01/11

  125. Granular nanostructures and magnetic characteristics of FePt-GeO2/FePt-C stacked granular films. International-presentation

    T. Ono, T. Moriya, M. Hatayama, K. Tsumura, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    13th Joint MMM/Intermag Conference 2016 2016/01/11

  126. Room Temperature Bonding of Wafers in Air using Ag, Al, Cu Films with Thin Au Capping Layers. International-presentation

    T. Shimatsu

    Conference on Wafer Bonding for Microsystems 3D- and Wafer Level Integration (Waferbond'15) 2015/12/07

  127. Atomic Diffusion Bnding and its practical applications International-presentation Invited

    T. Shimatsu

    International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT2015) 2015/10/21

  128. 薄いAuキャップ付きAg, Cu, Al薄膜を用いたウエハの大気中室温接合

    魚本 幸, 島津武仁

    (一社)スマートプロセス学会 第11 回 電⼦デバイス実装研究委員会 2015/09/15

  129. L10-FePt多結晶膜における磁気異方性とバリアント形成のFe組成依存性

    堀田明良, 小野拓也, 島津武仁, 菊池伸明, 岡本 聡, 北上 修

    第39回日本磁気学会学術講演会(平成27年) 2015/09/08

  130. マイクロ波磁場により励起されたCo/Pt 多層膜ドットのナノビームX線磁気円二色性測定

    菊池伸明, 岡本 聡, 北上 修, 島津武仁, 鈴木基寛

    第39回日本磁気学会学術講演会(平成27年) 2015/09/08

  131. マイクロ波アシスト磁化反転と強磁性共鳴の同一Co/Pt ナノドット試料での測定

    草薙勇作, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    第39回日本磁気学会学術講演会(平成27年) 2015/09/08

  132. 反強磁性結合を有するマイクロ波アシスト記録用CoCrPt グラニュラ垂直記録媒体の磁化反転機構

    中山湧稀, 草薙勇作, 島津武仁, 菊池伸明, 岡本 聡, 北上 修

    第39回日本磁気学会学術講演会(平成27年) 2015/09/08

  133. 次世代天文学観察用の新しい回折格子2

    海老塚 昇, 岡本隆之, 山形 豊, 森田晋也, 佐々木 実, 魚本 幸, 島津武仁, 田辺綾乃, 橋本信幸, 桐野宙治, 尾崎忍夫, 青木和光, 高見 英樹

    2015年度精密工学会秋季大会学術講演会 2015/09/04

  134. 薄いAu 薄膜を用いたFe バルク材の室温接合と接合性能

    魚本 幸, 島津武仁

    第25回マイクロエレクトロニクスシンポジウム秋季大会 MES2015 2015/09/03

  135. 次世代天文学観測装置用の新しい高分散回折格子

    海老塚 昇, 岡本隆之, 森田晋也, 山形 豊, 佐々木 実, 魚本 幸, 島津武仁, 田辺綾乃, 橋本信幸, 桐野宙治, 尾崎忍夫, 青木和光, 高見 英樹

    第40回日本光学会光学シンポジウム 2015/06/25

  136. A theoretical study of thermally activated magnetization switching under microwave assistance. International-presentation

    H. Suto, K. Kudo, T. Nagasawa, T. Kanao, K. Mizushima, R. Sato, S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu

    2015 IEEE International Magnetics Conference 2015/05/11

  137. ナノ金属薄膜を用いたポリマーシートの大気中の室温接合

    魚本 幸, 今 一恵, 島津 武仁

    第29回エレクトロニクス実装学会春季講演大会 2015/03/16

  138. Auキャップ付金属薄膜を用いたウエハの大気中室温接合Ⅱ(Cu, Al薄膜)

    魚本 幸, 今 一恵, 島津 武仁

    第29回エレクトロニクス実装学会春季講演大会 2015/03/16

  139. Au-(Ag, Cu)合金薄膜を用いたウエハの大気中室温接合と接合性能

    今 一恵, 魚本 幸, 島津 武仁

    第29回エレクトロニクス実装学会春季講演大会 2015/03/16

  140. Auキャップ付金属薄膜を用いたウエハの大気中室温接合Ⅰ(Ag薄膜)

    今 一恵, 魚本 幸, 島津 武仁

    第29回エレクトロニクス実装学会春季講演大会 2015/03/16

  141. Au薄膜を用いた大気中室温接合技術による超高真空用サファイアビューポートの形成

    石井 美帆, 今 一恵, 魚本 幸, 中谷 隆之, 島津 武仁

    第29回エレクトロニクス実装学会春季講演大会 2015/03/16

  142. 深紫外LEDの高出力化

    市川 将嗣, 藤岡 陽, 小杉 卓生, 遠藤 慎哉, 佐川 治信, 玉置 寛人, 向井 孝志

    第62回応用物理学会春季学術講演会 2015/03/11

  143. Microwave assisted magnetization switching based on non-uniform precession mode in layered nanodot International-presentation

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    59th Annual Conference on Magnetism and Magnetic Materials, MMM 2014 2014/11/03

  144. Magnetic characteristics and grain structures of FePt-(B, C)/FePt-C stacked granular films International-presentation

    Akira Furuta, Hiroto Kikuchi, Hiroyasu Kataoka, Takuya Ono, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    59th Annual Conference on Magnetism and Magnetic Materials, MMM 2014 2014/11/03

  145. Quantized spin wave modes on nanosized Co/Pt multilayer dots International-presentation

    Nobuaki Kikuchi, Masaki Furuta, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    59th Annual Conference on Magnetism and Magnetic Materials, MMM 2014 2014/11/03

  146. Room Temperature Bonding Using Thin Metal Films (Bonding Energy and Technical Potential) International-presentation Invited

    T. Shimatsu, M. Uomoto, H. Kon

    the 226th ElectroChemical Society (ECS) Meeting 2014/10/05

    More details Close

    1754, 8 October 2014

  147. Switching Behaviors of Co/Pt Nanodots and Its Dynamics under the Assistance of Rf Field International-presentation Invited

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami (IMRAM, Tohoku University, d T. Shimatsu (FRIS, Tohoku University, RIEC, Tohoku Universi

    the 226th ElectroChemical Society (ECS) Meeting 2014/10/05

    More details Close

    900, 6 October 2014

  148. 積層磁性ドットにおけるマイクロ波アシスト磁化反転

    古田 正樹, 岡本 聡, 菊地 伸明, 北上 修, 島津 武仁

    第38回日本磁気学会学術講演会(平成26年) 2014/09/02

  149. Co/Pt ナノドットの強磁性共鳴測定

    菊池 伸明, 古田 正樹, 岡本 聡, 北上 修, 島津 武仁

    第38回日本磁気学会学術講演会(平成26年) 2014/09/02

  150. 結晶粒内で反強磁性的結合を有するCoCrPt グラニュラ垂直磁気記録媒体の磁気特性と磁化反転機構

    中山 湧稀, 堀田 明良, 島津 武仁, 菊池 伸明, 岡本 聡, 北上 修

    第38回日本磁気学会学術講演会(平成26年) 2014/09/02

  151. L10-FePt多結晶垂直磁化膜のPt 表面偏析と規則度のPt 組成依存性

    堀田 明良, 小野 拓也, 島津 武仁, 菊池 伸明, 岡本 聡, 北上 修

    第38回日本磁気学会学術講演会(平成26年) 2014/09/02

  152. Co/Pt ナノドットにおけるマイクロ波アシスト磁化 反転挙動のサイズ依存性

    古田 正樹, 岡本 聡, 菊池 伸明, 北上 修, 島津 武仁

    電気学会A部門大会 2014/08/21

  153. Co/Ptナノドットのマイクロ波磁化反転 Invited

    菊池 伸明, 古田 正樹, 岡本 聡, 北上 修, 島津 武仁

    MSJスピンエレクトロニクス専門研究会 2014/07/30

  154. Room Temperature Bonding of Wafers in Air using Au-Ag Alloy Films International-presentation

    H. Kon, M. Uomoto, T. Shimatsu

    2014 4th International IEEE Workshop on Low Temperature Bonding for 3D Integration, LTB3D 2014 2014/07/15

  155. Room Temperature Bonding of Sapphire with Sapphire or Metal Substrates in Air using Au Films International-presentation

    M. Ishii, H. Kon, M. Uomoto, T. Nakaya, T. Shimatsu

    2014 4th International IEEE Workshop on Low Temperature Bonding for 3D Integration, LTB3D 2014 2014/07/15

  156. 原子拡散接合法による室温接合技術 Invited

    島津 武仁, 魚本 幸, 今 一恵

    溶接学会 第107回マイクロ接合研究委員会 2014/07/04

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    マイクロ接合優秀研究賞 受賞記念講演

  157. Switching dynamics of Co/Pt nanodots under the assistance of rf field International-presentation Invited

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu

    MISM 2014 2014/06/29

  158. マイクロ波 アシスト磁化反転技術の現状と課題 Invited

    岡本 聡, 古田 正樹, 菊池 伸明, 北上 修, 島津 武仁

    第21回 みちのく磁性談話会 2014/06/07

  159. Ferromagnetic resonance measurements on single nanoscale Co/Pt dots with perpendicular anisotropy International-presentation

    N. Kikuchi, S. Okamoto, M. Furuta, O. Kitakami, T. Shimatsu

    the IEEE International Magnetics Conference, INTERMAG Europe 2014 2014/05/04

  160. Ag薄膜を用いたウエハの室温接合と接合性能

    今 一恵, 魚本幸, 島津武仁

    第28回エレクトロニクス実装学会春季講演大会 2014/03/05

  161. W薄膜を用いたウエハの室温接合技術におけるW膜厚と接合性能

    魚本幸, 今 一恵, 島津武仁

    第28回エレクトロニクス実装学会春季講演大会 2014/03/05

  162. 原子拡散接合法を用いた室温接合技術 Room Temperature Bonding using Thin Metal Films (Atomic Diffusion Bonding) Invited

    島津 武仁, 魚本 幸, 今 一恵

    第20回 「エレクトロニクスにおけるマイクロ接合・実装技術」シンポジウム,Mate 2014 2014/02/04

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    [A-2] 低温実装 プログラムNo.6(企画) Feb. 2nd

  163. スピントルク発振による磁気共鳴を用いた3次元磁気記録 Invited

    日本磁気学会 第194回研究会 2014/01/10

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    佐藤 利江,首藤 浩文,工藤 究,永澤 鶴美,水島 公一,久保田 均,今村 裕志,谷口 友大, 田丸 慎吾,荒井 礼子,松本 利映,福島 章雄,鈴木 義茂,,前原 大樹,江村 藍,恒川 孝二, 岡本 聡,菊池 伸明,島津 武仁,北上 修

  164. Room Temperature Bonding of Wafers and Polished Metals using Thin Au Films for Enhancing the Heat Dissipation Efficiency International-presentation

    H. Kon, M. Uomoto, T. Shimatsu

    The International Conference on Wafer Bonding, WaferBond '13 2013/12/05

  165. Room Temperature Bonding of Wafers using Thin Metal Films with High Electrical Resistivities International-presentation

    T. Shimatsu, M. Uomoto, H. Kon

    The International Conference on Wafer Bonding, WaferBond '13 2013/12/05

  166. Rise time effect on magnetization reversal of Co/Pt multilayer nanodots by nanoseconds pulse fields International-presentation Invited

    N. Kikuchi, S. Okamoto, M. Furuta, O. Kitakami, T. Shimatsu

    Magnetics and Optics Research International Symposium, MORIS 2013 2013/12/02

  167. Curie temperature and magnetic anisotropy for L10 type Fe-Pt-Cu single crystal films International-presentation

    Tomohiro Moriya, Hitoshi Nakata, Kazuya Komiyama, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  168. Switching field and critical frequency distributions on microwave assisted switching in Co/Pt nanodot array International-presentation

    Masaki Furuta, Satoshi Okamoto, Nobuaki Kikuchi, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  169. Switching field reduction of Co-Cr-Pt granular film under the assistance of rf fields International-presentation

    Satoshi Okamoto, Nobuaki Kikuchi, Akira Hotta, Masaki Furuta, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  170. Grain segregation and uniaxial magnetic anisotropy for L10 type FePt-X (X=SiC, TiC) films on FePt-C template International-presentation

    Hiroyasu Kataoka, Hiroto Kikuchi, Akira Furuta, Kaoru Tsumura, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  171. Magnetic anisotropy and order structure of (001) textured L10-FePt polycrystalline films deposited on MgO seed layers International-presentation

    Akira Hotta, Takuya Ono, Masatoshi Hatayama, Kaoru Tsumura, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  172. Granular nanostructure and magnetic characteristics of FePt-MOx/FePt-C (M = Ti, Si) stacked granular films International-presentation

    Takuya Ono, Tomohiro Moriya, Masatoshi Hatayama, Nobuaki Kikuchi, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  173. Time dependent coercivity of granular media in a time scale from nanosecond to sub-millisecond regime International-presentation

    Nobuaki Kikuchi, Akira Hotta, Kazuya Kadonosawa, Masaki Furuta, Satoshi Okamoto, Osamu Kitakami, Takehito Shimatsu

    58th Annual Conference on Magnetism and Magnetic Materials, MMM 2013 2013/11/04

  174. 放熱用金属バルク材と電子デバイス用ウエハの大気中低温接合技術の開発

    今 一恵, 魚本 幸, 島津 武仁

    第23回マイクロエレクトロニクスシンポジウム MES2013 2013/09/12

  175. a-Si,a-Ge薄膜を用いたウエハの室温接合と接合性能

    魚本 幸, 今 一恵, 島津 武仁

    第23回マイクロエレクトロニクスシンポジウム MES2013 2013/09/12

  176. L10-FePt垂直磁化膜の一軸磁気異方性の膜厚依存性

    堀田明良, 小野拓也, 島津武仁, 菊池伸明, 岡本 聡, 北上 修

    第37回日本磁気学会学術講演会(平成25年) 2013/09/03

  177. マイクロ波アシスト磁化反転におけるCo/Ptドット依存性

    古田正樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    第37回日本磁気学会学術講演会(平成25年) 2013/09/03

  178. Co/Ptナノドットのマイクロ波アシストにおける反転磁場分散と臨界周波数分散

    古田正樹, 岡本 聡, 菊池伸明, 北上 修, 島津武仁

    第37回日本磁気学会学術講演会(平成25年) 2013/09/03

  179. Au薄膜を用いた大気中のウエハ室温接合における大気暴露時間と接合性能

    今 一恵, 魚本幸, 島津武仁

    第27回エレクトロニクス実装学会春季講演大会 2013/03/13

  180. Ti薄膜を用いたウエハの室温接合技術におけるTi膜厚と接合性能

    魚本幸, 今 一恵, 島津武仁

    第27回エレクトロニクス実装学会春季講演大会 2013/03/13

  181. Switching behaviors and its dynamics in a single Co/Pt multi- layer nanodot under microwave assistance International-presentation

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu

    12th Joint MMM/Intermag Conference 2013 2013/01/14

  182. Microwave assisted switching experiments in Co/Pt dot array with narrow switching field distribution International-presentation

    M. Furuta, S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu

    12th Joint MMM/Intermag Conference 2013 2013/01/14

  183. Irreversible magnetization reversal by in-plane pulse field in perpendicularly magnetized nanodots International-presentation

    N. Kikuchi, Y. Suyama, M. Furuta, S. Okamoto, O. Kitakami, T. Shimatsu

    12th Joint MMM/Intermag Conference 2013 2013/01/14

  184. Investigation of Surface Activation Bonding for Elucidation of Deposition Mechanism of Cold Spraying International-presentation

    Kentaro HASHIMOTO, Kazuhiro OGAWA, Takehito SHIMATSU

    The 5th Asian Thermal Spray Conference, ATSC2012 2012/11/26

  185. Switching behavior of single Co/Pt nanodot under microwave assistance

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu

    平成24年度スピニクス特別研究会 2012/11/26

  186. Microwave assisted switching experiment on Co/Pt multilayer dot array International-presentation

    M. Furuta, N. Kikuchi, S. Okamoto, O. Kitakami, T. Shimatsu

    International Conference of the Asian Union of Magnetics Societies, ICAUMS 2012 2012/10/02

  187. Switching behavior of single Co/Pt nanodot under microwave assistance International-presentation

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu

    International Conference of the Asian Union of Magnetics Societies, ICAUMS 2012 2012/10/02

  188. Magnetization reversal experiments on Co/Pt multilayer dot with a pulse field perpendicular to the magnetization International-presentation

    N. Kikuchi, Y. Suyama, S. Aizawa, S. Okamoto, O. Kitakami, T. Shimatsu

    International Conference of the Asian Union of Magnetics Societies, ICAUMS 2012 2012/10/02

  189. Microwave Assisted Magnetization Switching In Co/Pt Nanodot International-presentation Invited

    S. Okamoto, N. Kikuchi, M. Furuta, O. Kitakami, T. Shimatsu, Hajime Aoi

    23rd Magnetic Recording Conference, TMRC 2012 2012/08/20

  190. Atomic Diffusion Bonding of Wafers in Air with Thin Au Films and Its Application to Optical Devices Fabrication International-presentation

    T. Shimatsu, M. Uomoto, K. Oba, Y. Furukata

    2012 3rd International IEEE Workshop on Low Temperature Bonding for 3D Integration, LTB3D 2012 2012/05/22

  191. Atomic Diffusion Bonding with Thin Nanocrystalline Metal Films in Vacuum and in an Inert Gas International-presentation

    T. Shimatsu, M. Uomoto

    2012 3rd International IEEE Workshop on Low Temperature Bonding for 3D Integration, LTB3D 2012 2012/05/22

  192. Write margin measurement of bit patterned media with 20 nm dots International-presentation

    H. Saga, K. Shirahata, R. Terashima, T. Shimatsu, H. Aoi, H. Muraoka

    IEEE International Magnetics Conference, Intermag 2012 2012/05/07

  193. Room Temperature Bonding of Wafers in an Inert Gas with Thin Nanocrystalline Metal Films International-presentation

    T. Shimatsu

    The International Conference on Wafer Bonding, WaferBond '11 2011/12/06

  194. Magnetic anisotropy and order parameters for L10 type FePt polycrystalline films with (001) preferred grain orientation International-presentation

    D. Inoue, T. Shimatsu, Y. Inaba, H. Aoi, S. Okamoto, O. Kitakami

    56th Annual Conference on Magnetism and Magnetic Materials, MMM 2011 2011/10/30

  195. Switching behavior of Co/Pt multilayer nanodots under microwave assistance International-presentation

    S. Okamoto, N. Kikuchi, J. Li, O. Kitakami, T. Shimatsu, H. Aoi

    56th Annual Conference on Magnetism and Magnetic Materials, MMM 2011 2011/10/30

  196. Magnetic anisotropy of L10 type FePt-X (X=C, SiO2 and TiO2) granular media International-presentation

    Y. Inaba, T. Shimatsu, D. Inoue, K. Kudo, H. Aoi, S. Okamoto, O. Kitakami

    56th Annual Conference on Magnetism and Magnetic Materials, MMM 2011 2011/10/30

  197. Grain segregation and thermal stability for thin L10-FePt-C granular media International-presentation

    K. Kudo, Y. Inaba, D. Inoue, H. Aoi, T. Shimatsu

    56th Annual Conference on Magnetism and Magnetic Materials, MMM 2011 2011/10/30

  198. Dry-etching damage to magnetic anisotropy of Co-Pt dot arrays characterized using anomalous Hall effect International-presentation

    T. Shimatsu, H. Kataoka, K. Mitsuzuka, H. Aoi, N. Kikuchi, O. Kitakami

    56th Annual Conference on Magnetism and Magnetic Materials, MMM 2011 2011/10/30

  199. Co/Pt 多層膜ナノドットにおけるマイクロ波アシスト磁化反転実験

    岡本 聡, Jin LI, 菊池伸明, 北上 修, 島津武仁, 青井 基

    第35回日本磁気学会学術講演会(平成23年) 2011/09/27

  200. Co/Pt 多層膜の強磁性共鳴と緩和定数評価

    李 瑨, 菊池伸明, 岡本 聡, 北上 修, 島津武仁, 青井 基, 加藤剛志, 岩田 聡

    第35回日本磁気学会学術講演会(平成23年) 2011/09/27

  201. Analysis of Write Margin Loss Factors in Bit Patterned Media Recording International-presentation

    H. Saga, K. Shirahata, K. Mitsuzuka, T. Shimatsu, H. Aoi, H. Muraoka

    International Magnetics Conference, Intermag 2011 2011/04/25

  202. L10-FePt-C granular media fabricated by low temperature sputter film deposition International-presentation

    Y. Inaba, T. Shimatsu, D. Inoue, H. Nakata, K. Komiyama, H. Aoi, O. Kitakami, S. Okamoto

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  203. Experimental Write Margin Analysis of Bit Patterned Media International-presentation

    H. Aoi, H. Saga, K. Shirahata, K. Miura, T. Shimatsu, H. Muraoka

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  204. Magnetic properties of L11-type CoPt-X (X: C, SiO2, MgO) ordered alloy perpendicular films International-presentation

    H. Kataoka, T. Shimatsu, Y. Inaba, S. Okamoto, O. Kitakami, H. Aoi

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  205. Coercivity at a recording speed of CoPtCr-SiO2 based granular media for thermally assisted recording International-presentation

    D. Inoue, Y. Inaba, K. Komiyama, T. Shimatsu

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  206. Magnetostriction of Co-Fe-Zr-Ta amorphous thin films for soft underlayers of recording media International-presentation

    H. Nakata, K. Komiyama, T. Shimatsu

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  207. Microwave assisted magnetization switching in Co/Pt multilayer International-presentation

    S. Okamoto, N. Kikuchi, O. Kitakami, T. Shimatsu, H. Aoi

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  208. Nucleation size for dot arrays of Co-Pt based perpendicular films characterized by time dependence of coercivity International-presentation

    H. Kataoka, T. Shimatsu, K. Mitsuzuka, H. Aoi, N. Kikuchi, O. Kitakami

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  209. Dot arrays of L10 type FePt ordered alloy perpendicular films fabricated by low-temperature sputter film deposition International-presentation

    T. Shimatsu, Y. Inaba, H. Kataoka, J. Sayama, H. Aoi, O. Kitakami, S. Okamoto

    55th Annual Conference on Magnetism and Magnetic Materials, MMM 2010 2010/11/14

  210. Room Temperature Bonding of Wafers with Thin Nanocrystalline Metal Films International-presentation Invited

    T. Shimatsu, M. Uomoto

    the 218th ElectroChemical Society (ECS) Meeting 2010/10/10

  211. Magnetic Anisotropy of L11-type Co-Pt-M(M:Ni, Fe, Cr, Mn, Pd)Ordered Alloy Perpendicular Films International-presentation

    Hiroyasu Kataoka, Takehito Shimatsu, Satoshi Okamoto, Osamu Kitakami, Hajime Aoi

    The 2nd International Symposium on Advanced Magnetic Materials and Applications, ISAMMA 2010 2010/07/12

  212. Nucleation Size of hcp-CoPt Nano-Dot Arrays International-presentation

    Takehito Shimatsu, Kaname Mitsuzuka, Nobuaki Kikuchi, Osamu Kitakami, Hajime Aoi

    The 2nd International Symposium on Advanced Magnetic Materials and Applications, ISAMMA 2010 2010/07/12

  213. Basic Read/Write Characteristics Measurements of BPM with Static Tester International-presentation

    Hajime Aoi, Hideki Saga, Ryosuke Tatsuno, Kazuki Shirahata, Kaname Mitsuzuka, Kenji Miura, Takehito Shimatsu, Hiroaki Muraoka

    The 9th Perpendicular Magnetic Recording Conference, PMRC 2010 2010/05/17

  214. Nucleation Size of hcp-CoPt Dot Arrays International-presentation

    Takehito Shimatsu, Kaname Mitsuzuka, Nobuaki Kikuchi, Osamu Kitakami, Hajime Aoi

    The 9th Perpendicular Magnetic Recording Conference, PMRC 2010 2010/05/17

  215. Equilibrium Domain State of Circular Nanomagnet International-presentation

    O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, K. Mituzuka, H. Aoi

    The 9th Perpendicular Magnetic Recording Conference, PMRC 2010 2010/05/17

  216. Magnetic Anisotropy of L11-type Co-Pt-M (M: Ni, Fe, Cr, Mn, Pd) Ordered Alloy Perpendicular Films International-presentation Invited

    Takehito Shimatsu, Hiroyasu Kataoka, Satoshi Okamoto, Osamu Kitakami, Hajime Aoi

    The 9th Perpendicular Magnetic Recording Conference, PMRC 2010 2010/05/17

  217. Atomic Diffusion Bonding of Wafers with Thin Nanocrystalline Metal Films International-presentation Invited

    Takehito Shimatsu

    2nd International IEEE Workshop on Low Temperature Bonding for 3D Integration, LTB-3D 2010 2010/01/19

  218. L11-(Co-Ni)-Pt 垂直磁化膜の磁気特性の温度依存性

    島津武仁, 佐山淳一, 青井 基, 北上 修

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  219. L11-CoPt‐C 規則合金垂直膜の構造と磁気特性

    島津武仁, 佐藤英夫, 片岡弘康, 岡本 聡, 北上 修, 青井 基

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  220. L11-(Co1-XMX)50Pt50(M: Ni, Fe, Cr, Mn) 及びCo50(Pt1-XPdX)50 規則合金垂直磁化膜の構造と磁気特性

    片岡弘康, 島津武仁, 佐藤英夫, 岡本 聡, 北上 修, 青井 基

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  221. hcp-Co-Pt 垂直磁化ドットの磁化反転における反転核の大きさ

    島津武仁, 三塚 要, 菊池伸明, 北上 修, 青井 基

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  222. hcp-CoPt 垂直磁化ドットの磁気異方性に及ぼす加工ダメージの影響

    三塚 要, 島津武仁, 菊池伸明, 北上 修, 青井 基

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  223. hcp-Co-Pt 垂直磁化ドットの残留保磁力を決める要因に関する考察

    三塚 要, 島津武仁, 菊池伸明, 北上 修, 青井 基

    第33回日本磁気学会学術講演会(平成21年) 2009/09/12

  224. Magnetic anisotropy of L11-type CoPt-M (M:Ni, Fe, Cr and Pd) ordered alloy perpendicular films International-presentation

    H. Kataoka, H. Sato, T. Shimatsu, S. Okamoto, O. Kitakami, H. Aoi

    International Conference on Magnetism, ICM 2009 2009/07/26

  225. Magnetic properties of L11-type CoPt-C ordered alloy perpendicular films as a function of C content International-presentation

    T. Shimatsu, H. Sato, H. Kataoka, S. Okamoto, O. Kitakami, H. Aoi

    International Conference on Magnetism, ICM 2009 2009/07/26

  226. Nucleation size of hcp-CoPt dot arrays characterized by time dependence of coercivity International-presentation

    Nobuaki Kikuchi, Kaname Mitsuzuka, Takehito Shimatsu, Osamu Kitakami, Hajime Aoi

    International Conference on Magnetism, ICM 2009 2009/07/26

  227. Reduction of substrate temperature to fabricate L11-type CoPt ordered alloy perpendicular films on glass disks International-presentation

    Yuta Toyoda, Takehito Shimatsu, Hideo Sato, Satoshi Okamoto, Osamu Kitakami

    International Conference on Magnetism, ICM 2009 2009/07/26

  228. Remanence coercivity of hcp-CoPt dot arrays International-presentation

    Kaname Mitsuzuka, Takehito Shimatsu, Nobuaki Kikuchi, Osamu Kitakami, Hajime Aoi

    International Conference on Magnetism, ICM 2009 2009/07/26

  229. Temperature dependence of magnetic properties for L11-type Co-Ni-Pt ordered alloy films International-presentation

    T. Shimatsu, J. Sayama, S. Okamoto, O. Kitakami, H. Aoi

    International Conference on Magnetism, ICM 2009 2009/07/26

  230. Fabrication of L11 type (Co-Ni)-Pt ordered alloy films by sputter deposition for bit-patterned media International-presentation

    H. Sato, T. Shimatsu, H. Kataoka, H. Aoi, O. Kitakami, S. Okamoto

    53rd Annual Conference on Magnetism and Magnetic Materials, MMM 2008 2008/11/10

  231. Dot arrays of L11 type Co-Pt ordered alloy perpendicular films International-presentation

    T. Shimatsu, H. Sato, K. Mitsuzuka, H. Kataoka, H. Aoi, N. Kikuchi, O. Kitakami

    53rd Annual Conference on Magnetism and Magnetic Materials, MMM 2008 2008/11/10

  232. Magnetic properties of thin Co-Pt dot arrays with a large uniaxial magnetic anisotropy International-presentation

    K. Mitsuzuka, T. Shimatsu, N. Kikuchi, O. Kitakami, H. Muraoka, H. Aoi

    53rd Annual Conference on Magnetism and Magnetic Materials, MMM 2008 2008/11/10

  233. Magnetic behavior of single nanostructured magnet International-presentation Invited

    O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, H. Sato, H. Aoi

    International Conference on Advanced Structural and Functional Materials Design 2008 2008/11/10

  234. L11-Co-Pt垂直磁化膜の磁気異方性と飽和磁化

    佐藤英夫, 島津武仁, 片岡弘康, 青井 基, 岡本 聡, 北上 修

    第32回日本磁気学会学術講演会(平成20年) 2008/09/12

  235. スパッタ法で作製したL11-Co-Pt垂直磁化膜の構造と磁気特性

    島津武仁, 佐藤英夫, 青井 基, 岡本 聡, 北上 修

    第32回日本磁気学会学術講演会(平成20年) 2008/09/12

  236. 高Kuを有する極薄hcp-Co-Ptパターン膜の磁気特性

    三塚 要, 島津武仁, 菊池伸明, 北上 修, 村岡裕明, 青井 基

    第32回日本磁気学会学術講演会(平成20年) 2008/09/12

  237. Magnetic Behavior of Nanostructured Magnets for Bit Patterned Media Invited

    N. Kikuchi, K. Mitsuzuka, S. Okamoto, Kitakami, T. Shimatsu, H. Aoi

    第32回日本磁気学会学術講演会(平成20年) 2008/09/12

  238. L11-Co-Ptパターン膜のドットサイズと磁気特性

    島津武仁, 佐藤英夫, 三塚 要, 片岡弘康, 青井 基, 菊池伸明, 北上修

    第32回日本磁気学会学術講演会(平成20年) 2008/09/12

  239. Study on nanostructured magnets for bit patterned media International-presentation Invited

    O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, H. Aoi

    International Disk Forum 2008 2008/07

  240. Thermal stability and switching field of Hard/Soft stacked perpendicular media International-presentation

    T. Shimatsu, K. Kudo, N. Asakula, Y. Inaba, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi

    52nd Annual Conference on Magnetism and Magnetic Materials, MMM 2007 2007/11/05

  241. Magnetic properties of Hard/Soft stacked perpendicular media with various soft layer thickness International-presentation

    T. Shimatsu, A. Satoh, N. Asakura, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi

    52nd Annual Conference on Magnetism and Magnetic Materials, MMM 2007 2007/11/05

  242. Uniaxial magnetic Co anisotropy in Co and Co-Pt based perpendicular films in relation to lattice deformation International-presentation

    T. Shimatsu, Y Okazaki, H. Sato, O. Kitakami, S. Okamoto, T. Sakurai, H. Muraoka, H. Aoi, S. Tani, A. Sakuma

    52nd Annual Conference on Magnetism and Magnetic Materials, MMM 2007 2007/11/05

  243. Magnetic properties of Co-Pt/Co Hard/Soft-stacked dot arrays International-presentation

    K. Mitsuzuka, N. Kikuchi, T. Shimatsu, O. Kitakami, H. Muraoka, H. Aoi

    52nd Annual Conference on Magnetism and Magnetic Materials, MMM 2007 2007/11/05

  244. Fabrication of L11 type Co-Pt ordered alloy films by sputter deposition International-presentation

    H. Sato, T. Shimatsu, Y. Okazaki, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi

    52nd Annual Conference on Magnetism and Magnetic Materials, MMM 2007 2007/11/05

  245. Magnetization behavior of nanomagnets for patterned media application International-presentation Invited

    Satoshi OKAMOTO, Nobuaki KIKUCHI, Osamu KITAKAMI, Takehito Shimatsu

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  246. Investigation of Cylindrical Magnetic Storage Systems International-presentation

    Hiroshi YAMADA, Hiroyuki KIKUCHI, Takehito Shimatsu, Isao WATANABE, Hajime AOI, Hiroaki MURAOKA, Junji NUMAZAWA, Yoshihisa NAKAMURA

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  247. Fabrication of Co-Pt ordered alloy films with a large uniaxial anisotropy by sputter deposition International-presentation

    Hideo SATO, Takehito Shimatsu, Yuko OKAZAKI, Osamu KITAKAMI, Satoshi OKAMOTO, Hiroaki MURAOKA, Hajime AOI

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  248. Magnetization reversal of Co-Pt/Co Hard/Soft-stacked dot arrays International-presentation

    Kaname MITSUZUKA, Nobuaki KIKUCHI, Takehito Shimatsu, Osamu KITAKAMI, Hiroaki MURAOKA, Hajime AOI

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  249. Uniaxial magnetic anisotropy and lattice deformation in Co and Co-Pt based perpendicular films International-presentation

    Yuko OKAZAKI, Takehito Shimatsu, Hideo SATO, Osamu KITAKAMI, Satoshi OKAMOTO, Tomoaki SAKURAI, Hiroaki MURAOKA, Hajime AOI, Shunsuke TANII, Akimasa SAKUMA

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  250. Magnetic properties of Hard/Soft-stacked granular perpendicular media with various soft layer thickness International-presentation

    Akira SATOH, Takehito Shimatsu, Noriyuki ASAKURA, Osamu KITAKAMI, Satoshi OKAMOTO, Hiroaki MURAOKA, Hajime AOI

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  251. XMCD Study of Pt Orbital Contribution to Perpendicular Magnetization in CoPt Thin-Films International-presentation

    N. IShimatsu, Y. TSUTSUI, H. MARUYAMA, N. KAWAMURA, M. SUZUKI, H. OSAWA, Y. OKAZAKI, H. SATO, T. Shimatsu, H. MURAOKA

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  252. Thermal stability and switching field of Hard/Soft-stacked granular perpendicular media International-presentation

    Koji KUDO, Takehito Shimatsu, Noriyuki ASAKURA, Yuki INABA, Osamu KITAKAMI, Satoshi OKAMOTO, Hiroaki MURAOKA, Hajime AOI

    The 8th Perpendicular Magnetic Recording Conference, PMRC 2007 2007/10/15

  253. Hard/Soft スタック垂直媒体の熱安定性と残留保磁力

    島津武仁, 朝倉紀之, 稲葉祐樹, 工藤幸司, 北上 修, 岡本 聡, 村岡裕明, 青井 基

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  254. Hard/Softスタック型CoPt/Coパターン膜の磁化機構

    三塚 要, 菊池伸明, 島津武仁, 北上 修, 村岡裕明, 青井 基

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  255. hard/softスタック垂直媒体のソフト層の厚みと磁化過程

    朝倉紀之, 島津武仁, 佐藤 啓, 北上 修, 岡本 聡, 村岡裕明, 青井 基

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  256. スパッタリング法による高磁気異方性Co-Pt規則化合金膜の作成

    佐藤英夫, 島津武仁, 岡崎裕子, 北上 修, 岡本 聡, 村岡裕明, 青井 基

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  257. Co-Pt系垂直磁化膜の一軸磁気異方性と結晶格子の歪み

    岡崎裕子, 島津武仁, 佐藤英夫, 北上 修, 岡本 聡, 桜井伴明, 村岡裕明, 青井 基, 岩井俊介, 佐久間昭正

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  258. Ru 下地上におけるCoPd 薄膜の磁気特性と構造

    桜井伴明, 菊池伸明, 岡本 聡, 北上 修, 島津武仁

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  259. Possibility of 1 Tbpsi recording by H/S stacked media Invited

    O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, H. Aoi

    第31回日本応用磁気学会学術講演会(平成19年) 2007/09/11

  260. Pt content dependence of the switching field distributions of CoPtCr-SiO2 perpendicular media characterized by subtracting the effect of thermal agitation International-presentation

    T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    10th Joint MMM/Intermag Conference 2007 2007/01/07

  261. Interfacial exchange coupling and magnetization reversal for Co-SiO2/(Co-Pt)-SiO2 hard/soft-stacked perpendicular media International-presentation

    T. Shimatsu, Y. Inaba, S. Watanabe, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    10th Joint MMM/Intermag Conference 2007 2007/01/07

  262. Magnetic anisotropy of Co-M-Pt (M=Cr, Mo, Ru, W, Re) perpendicular films epitaxially deposited on various seed layers materials International-presentation

    H. Sato, T. Shimatsu, Y. Okazaki, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    10th Joint MMM/Intermag Conference 2007 2007/01/07

  263. Large uniaxial magnetic anisotropy of Co-Pt perpendicular films induced by lattice deformation International-presentation

    T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    10th Joint MMM/Intermag Conference 2007 2007/01/07

  264. Thickness dependence of the switching field and thermal stability of CoPt/Ru dot arrays International-presentation

    K. Mitsuzuka, N. Kikuchi, T. Shimatsu, O. Kitakami, H. Aoi, H. Muraoka, J. C. Lodder

    10th Joint MMM/Intermag Conference 2007 2007/01/07

  265. Investigation of inclined-pad type head for cylindrical magnetic storage system International-presentation

    H. Yamada, R. Tsuchiyama, H. Kikuchi, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2006 2006/05/08

  266. Large uniaxial magnetic anisotropy in Co100-XPtX/Ru disordered perpendicular films International-presentation

    T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2006 2006/05/08

  267. Pt content dependence of magnetic properties of CoPt/Ru patterned films International-presentation

    K. Mitsuzuka, N. Kikuchi, T. Shimatsu, O. Kitakami, H. Aoi, H. Muraoka, J. C. Lodder

    IEEE International Magnetics Conference, Intermag 2006 2006/05/08

  268. Switching field distribution of CoPtCr-SiO2 perpendicular recording media obtained by subtracting thermal agitation of magnetization International-presentation

    T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2006 2006/05/08

  269. Magnetic properties to optimize the Ku2 effect in perpendicular recording media International-presentation

    H. Sato, T. Shimatsu, T. Kondo, S. Watanabe, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2006 2006/05/08

  270. Effect of thermal agitation on the switching field distributions of CoPtCr-SiO2 perpendicular recording media International-presentation

    T. Shimatsu, T. Kondo, K. Mitsuzuka, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  271. Anomalous Hall effect measurement with pulse field on high anisotropy dots of CoPt International-presentation

    N. Kikuchi, R. Murillo, J. C. Lodder, K. Mitsuzuka, T. Shimatsu

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  272. CoPtCr-SiO2 media with Ku2 magnetic anisotropy term fabricated with Pd seed layers International-presentation

    H. Sato, T. Shimatsu, T. Kondo, S. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura, S. Okamoto, O. Kitakami

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  273. Thermal stability and recording writability of hard/soft stacked perpendicular media International-presentation

    Y. Inaba, T. Shimatsu, H. Aoi, H. Muraoka, Y. Nakamura, O. Kitakami

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  274. Study of stacking faults effect on magnetic anisotropy of CoPtCr-SiO2 perpendicular media by synchrotron radiation x-ray diffraction International-presentation

    T. Kubo, Y. Kuboki, R. Tanuma, A. Saito, S. Watanabe, T. Shimatsu

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  275. Large uniaxial magnetic anisotropy by lattice deformation in CoPt/Ru perpendicular films International-presentation

    T. Shimatsu, H. Sato, Y. Okazaki, H. Aoi, H. Muraoka, Y. Nakamura, S. Okamoto, O. Kitakami

    50th Annual Conference on Magnetism and Magnetic Materials, MMM 2005 2005/10/30

  276. CoPtCr-SiO2 perpendicular media for high density recording with a high order magnetic anisotropy energy term International-presentation

    T. Shimatsu, H. Sato, T. Oikawa, K. Mitsuzuka, Y. Inaba, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2005 2005/04/04

  277. Preliminary study on (CoPtCr/NiFe)-SiO2 hard/soft-stacked perpendicular recording media International-presentation

    Y. Inaba, T. Shimatsu, O. Kitakami, H. Sato, T. Oikawa, H. Muraoka, H. Aoi, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2005 2005/04/04

  278. Activation volumes in CoPtCr-SiO2 perpendicular recording media International-presentation

    Y. Inaba, T. Shimatsu, H. Muraoka, J. D. Dutson, K. O'Grady

    IEEE International Magnetics Conference, Intermag 2005 2005/04/04

  279. Magnetization process of high anisotropy CoPt nanosized dots International-presentation

    N. Kikuchi, R. Murillo, J. C. Lodder, K. Mitsuzuka, T. Shimatsu

    IEEE International Magnetics Conference, Intermag 2005 2005/04/04

  280. Ku2 term of magnetic anisotropy of CoPtCr-SiO2 media for high density recording International-presentation

    T. Shimatsu, H. Sato, K. Mitsuzuka, T. Oikawa, Y. Inaba, H. Aoi, H. Muraoka, Y. Nakamura, O. Kitakami, S. Okamoto

    49th Annual Conference on Magnetism and Magnetic Materials, MMM 2004 2004/11/14

  281. Crystallographic analysis of CoPtCr-SiO2 perpendicular recording media with high magnetic anisotropy using synchrotron radiation X-ray diffraction International-presentation

    T. Kubo, Y. Kuboki, M. Ohsawa, R. Tanuma, A. Saito, T. Oikawa, H. Uwazumi, T. Shimatsu

    49th Annual Conference on Magnetism and Magnetic Materials, MMM 2004 2004/11/14

  282. High potential magnetic anisotropy of CoPtCr-SiO2 perpendicular recording media International-presentation Invited

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    15th Magnetic Recording Conference, TMRC 2004 2004/08

  283. Magnetic anisotropy of CoPtCr-SiO2 perpendicular recording media for high density recording International-presentation Invited

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    The Seventh Perpendicular Magnetic Recording Conference, PMRC 2004 2004/05/31

  284. High magnetic anisotropy and microstructure in CoPtCr(-SiO2) perpendicular films International-presentation

    H. Sato, T. Shimatsu, K. Mitsuzuka, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    The Seventh Perpendicular Magnetic Recording Conference, PMRC 2004 2004/05/31

  285. Thermal agitation and media performance in thin CoPtCr-SiO2 perpendicular recording media International-presentation

    Y. Inaba, T. Shimatsu, T. Oikawa, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    The Seventh Perpendicular Magnetic Recording Conference, PMRC 2004 2004/05/31

  286. Optimization of SiO2 content and microstructure for CoPtCr-SiO2 perpendicular recording media International-presentation

    T. Oikawa, T. Shimatsu, Y. Inaba, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    The Seventh Perpendicular Magnetic Recording Conference, PMRC 2004 2004/05/31

  287. R/W performance of perpendicular double-Layered cylindrical media International-presentation

    H. Yamada, T. Shimatsu, I. Watanabe, H. Aoi, H. Muraoka, Y. Nakamura

    The Seventh Perpendicular Magnetic Recording Conference, PMRC 2004 2004/05/31

  288. High perpendicular magnetic anisotropy of CoPtCr/Ru films for granular-type perpendicular media International-presentation

    T. Shimatsu, H. Sato, T. Oikawa, Y. Inaba, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    9th Joint MMM/Intermag Conference 2004 2004/01/05

  289. Optimization of the SiO2 content in CoPtCr-SiO2 perpendicular recording media for high-density recording International-presentation

    Y. Inaba, T. Shimatsu, T. Oikawa, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    9th Joint MMM/Intermag Conference 2004 2004/01/05

  290. High potential of thin CoPtCr-SiO2/Ru perpendicular recording media to resist thermal agitation International-presentation

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    9th Joint MMM/Intermag Conference 2004 2004/01/05

  291. Development of ultra-high density perpendicular recording media International-presentation

    T. Shimatsu, O. Kitakami

    International Symposium on Ultra-High Density Spinic Storage Systems, ISSS 2003/10/30

  292. Pt, Cr composition dependence of media performance of CoPtCr-SiO2/Ru perpendicular recording media International-presentation

    T. Oikawa, T. Shimatsu, O. Kitakami, Y. Inaba, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    International Symposium on Ultra-High Density Spinic Storage Systems, ISSS 2003/10/30

  293. Optimization of the SiO2 content in CoPtCr-SiO2 perpendicular recording media for high density recording International-presentation

    Y. Inaba, T. Shimatsu, T. Oikawa, H. Sato, H. Aoi, H. Muraoka, Y. Nakamura

    International Symposium on Ultra-High Density Spinic Storage Systems, ISSS 2003/10/30

  294. Investigation of cylindrical magnetic storage system International-presentation

    H. Yamada, I. Watanabe, T. Shimatsu, H. Aoi, H. Muraoka, Y. Nakamura

    International Symposium on Ultra-High Density Spinic Storage Systems, ISSS 2003/10/30

  295. Large perpendicular magnetic anisotropy of CoPtCr/Ru films for granular-type perpendicular media International-presentation

    T. Shimatsu, H. Sato, T. Oikawa, Y. Inaba, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

    International Symposium on Ultra-High Density Spinic Storage Systems, ISSS 2003/10/30

  296. Formation of magnetic cluster and remanence coercivity in granular-type perpendicular media International-presentation

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2003 2003/03/30

  297. Effect of lattice strain on soft magnetic properties in FeCo/NiFe(Cr) thin films with 2.4 T International-presentation

    T. Shimatsu, H. Katada, I. Watanabe, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2003 2003/03/30

  298. Preliminary investigation for a cylindrical magnetic storage system International-presentation

    H. Yamada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2003 2003/03/30

  299. Magnetic cluster size and magnetization curves in perpendicular recording media International-presentation

    T. Shimatsu, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura

    [NA]PMRC 2003 2003/01/06

  300. Magnetic cluster size and activation volume in perpendicular recording media International-presentation

    T. Shimatsu, H. Uwazumi, T. Oikawa, Y. Inaba, H. Muraoka, Y. Nakamura

    47th Annual Conference on Magnetism and Magnetic Materials, MMM 2002 2002/11/11

  301. Soft magnetic properties and microstructures in NiFe/FeCo/NiFe films with large saturation magnetization International-presentation

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2002 2002/04/28

  302. High mobility of surface atoms and induced uniaxial anisotropy in very thin permalloy films International-presentation

    H. Katada, T. Shimatsu, H. Watanabe, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    IEEE International Magnetics Conference, Intermag 2002 2002/04/28

  303. Thermal agitation of magnetization and recording performance of Co(B)/Pd superlattice Perpendicular Recording Media International-presentation

    T. Shimatsu, M. Terakawa, I. Watanabe, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2002 2002/04/28

  304. Magnetization reversal of perpendicular recording media characterized using a pulse magnetometer International-presentation

    T. Shimatsu, H. Uwazumi, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2002 2002/04/28

  305. Microstructure and magnetic properties of CoPtCr-SiO2 perpendicular recording media International-presentation

    T. Oikawa, M. Nakamura, H. Uwazumi, T. Shimatsu, H. Muraoka, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2002 2002/04/28

  306. R/W performance and magnetization switching of CoTb/CoCrPt composite perpendicular media International-presentation

    H. Uwazumi, T. Shimatsu, Y. Sakai, K. Enomoto, S. Takenoiri, S. Watanabe, H. Muraoka, Y. Nakamura

    46th Annual Conference on Magnetism and Magnetic Materials, MMM 2001 2001/11/12

  307. High thermal stability in CoPrTb/CoCrTa composite perpendicular media International-presentation

    T. Shimatsu, H. Muraoka, Y. Nakamura, Y. Sonobe, Y. Satodate, K. Muramatsu, I. Watanabe

    46th Annual Conference on Magnetism and Magnetic Materials, MMM 2001 2001/11/12

  308. Switching field distributions of 40Gbits/in2 longitudinal media obtained by subtracting thermal agitation of magnetization International-presentation

    H. Uwazumi, T. Shimatsu, Y. Kuboki

    46th Annual Conference on Magnetism and Magnetic Materials, MMM 2001 2001/11/12

  309. Induced uniaxial anisotropy in very thin soft magnetic films International-presentation

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    The 8th Joint MMM-Intermag Conference 2001 2001/01/07

  310. Recording performance of CoCrPt-(Ta,B)/TiCr perpendicular recording media International-presentation

    H. Uwazumi, Y. Sakai, A. Otsuki, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    The 8th Joint MMM-Intermag Conference 2001 2001/01/07

  311. Thermal agitation of magnetization in CoCrPt perpendicular recording media International-presentation

    T. Shimatsu, H. Uwazumi, Y. Sakai, A. Otsuki, I. Watanabe, H. Muraoka, Y. Nakamura

    The 8th Joint MMM-Intermag Conference 2001 2001/01/07

  312. Thermal stability in perpendicular recording media International-presentation Invited

    T. Shimatsu, H. Uwazumi, H. Muraoka, Y. Nakamura

    The Fifth Perpendicular Magnetic Recording Conference, PMRC 2000 2000/10/23

  313. Evaluation of thermal stability of perpendicular recording media using a pulse magnetometer International-presentation

    T. Shimatsu, R. Yoshida, H. Uwazumi, I. Watanabe, H. Muraoka, Y. Nakamura

    The Fifth Perpendicular Magnetic Recording Conference, PMRC 2000 2000/10/23

  314. Magnetic anisotropy and thermal agitation of magnetization in CoPrTb amorphous perpendicular films International-presentation

    T. Shimatsu, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Nakamura

    The Fifth Perpendicular Magnetic Recording Conference, PMRC 2000 2000/10/23

  315. Film magnetostriction and induced uniaxial anisotropy of very thin soft magnetic films International-presentation

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Nakamura, Y. Sugita

    The Fifth Perpendicular Magnetic Recording Conference, PMRC 2000 2000/10/23

  316. Induced uniaxial magnetic anisotropy field in very thin NiFe and CoZrNb films. International-presentation

    H. Katada, T. Shimatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2000 2000/04/09

  317. Experimental and theoretical analysis of rotational hysteresis loss in CoCrTa perpendicular recording media International-presentation

    T. Shimatsu, S. J. Greaves, K. Muramatsu, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 2000 2000/04/09

  318. Effect of a Ti seed-layer on the magnetic properties of CoCrTa double-layered perpendicular media International-presentation

    T. Shimatsu, H. Komagome, I. Watanabe, H. Muraoka, Y. Sugita, Y. Nakamura

    44th Annual Conference on Magnetism and Magnetic Materials, MMM 1999 1999/11/15

  319. Thermal fluctuation of magnetization in nanocrystalline FePt thin films with high coercivity International-presentation

    T. Shimatsu, J. C. Lodder, Y. Sugita, Y. Nakamura

    IEEE International Magnetics Conference, Intermag 1999 1999/05/18

  320. Magnetic aftereffect and magnetocrystalline anisotropy of FePt-TaN nanocrystalline thin films International-presentation

    T. Shimatsu, E. G. Keim, T. Bolhuis, J. C. Lodder

    15th International Colloquium on Magnetic Films and Surfaces 1997/08

  321. Latest development of the spin-valve transistor International-presentation Invited

    J. C. Lodder, D. J. Monsma, R. H. Mollema, T. Shimatsu, R. Vlutters

    The First Toyota Workshop on Magnetism and Magnetic Materials for High Density Information Storage 1997/04/17

  322. Development of the spin-valve transistor International-presentation Invited

    D. J. Monsma, T. Shimatsu, R. Vlutters, E. G. Keim, R. H. Mollema, J. C. Lodder

    IEEE International Magnetics Conference, Intermag 1997 1997/04/01

  323. Effects of grain size and intergranular coupling on recording characteristics in CoCrTa media International-presentation

    H. Sato, A. Kikuchi, J. Nakai, H. Mitsuya, T. Shimatsu, M. Takahashi

    IEEE International Magnetics Conference, Intermag 1996 1996/04/09

  324. Effect of surface cleanness on the magnetic properties of CoNiCr and CoCrTa thin-film media fabricated using an ultraclean sputtering process International-presentation

    S. Kawakita, T. Sakurai, A. Kikuchi, T. Shimatsu, M. Takahashi

    6th International Conference on Magnetic Recording Media 1995/07

  325. Microstructure and intergranular coupling in CoCrTa thin-film media fabricated using an ultraclean sputtering process International-presentation

    J. Nakai, A. Kikuchi, K. Nakatani, M. Hirasaka, T. Shimatsu, M. Takahashi

    6th International Conference on Magnetic Recording Media 1995/07

  326. Intergranular coupling and recording properties of CoCrTa and CoNiCr thin-film media fabricated using an ultraclean sputtering International-presentation

    A. Kikuchi, I. Okamoto, J. Nakai, S. Kawakita, T. Shimatsu, M. Takahashi

    6th International Conference on Magnetic Recording Media 1995/07

  327. Intergranular magnetic coupling in CoNiCrPt and CoCrTaPt thin-film media characterized by the temperature dependence of the rotational hysteresis loss International-presentation

    T. Shimatsu, D. D. Djayaprawira, A. Endo, N. Iwata, M. Takahashi, T. Wakiyama

    6th International Conference on Magnetic Recording Media 1995/07

  328. Effect of Pt on the magnetic anisotropy and intergranular exchange coupling in(Co86Cr12Ta2)100-XPtX and(Co62.5Ni30Cr7.5)100-XPtX thin-film media International-presentation

    T. Shimatsu, D. D. Djayaprawira, M. Takahashi, T. Wakiyama

    6th International Conference on Magnetic Recording Media 1995/07

  329. Thin Film Media Fabricated under Ultra Clean Sputtering Process International-presentation Invited

    T. Shimatsu, M. Takahashi

    1995 Spring Meeting of Material Research Society of Korea 1995/05

  330. Effect of microstructure on media noise of CoCrTa thin film media fabricated under ultra clean sputtering process International-presentation

    J. Nakai, A. Kikuchi, M. Kuwabara, T. Sakurai, T. Shimatsu, M. Takahashi

    IEEE International Magnetics Conference, Intermag 1995 1995/04/18

  331. Extremely clean sputtering process and microstructural properties of Ni-Fe films fabricated by this process International-presentation

    K. Okuyama, T. Shimatsu, S. Kuji, M. Takahashi

    IEEE International Magnetics Conference, Intermag 1995 1995/04/18

  332. High Coercive Force and Low Intergranular Coupling in CoCrTa and CoNiCr Thin Film Media Fabricated under Ultra Clean Sputtering Process International-presentation Invited

    T. Shimatsu, M. Takahashi

    1994 IUMRS International Conference on Electronic Materials, IUMRS-ICEM'94 1994/12

  333. High coercive force and low intergranular coupling in CoCrTa thin film recording media fabricated under ultra clean sputtering process International-presentation

    M. Imakawa, S. Ishibashi, A. Hatashita, T. Shimatsu, M. Takahashi

    14th International Colloquium on Magnetic Films and Surfaces 1994/08

  334. Magnetic anisotropy and switching field of metal particulate recording media characterized by magnetic torque analysis International-presentation

    M. Igaki, H. Nagamori, T. Shimatsu, M. Takahashi

    14th International Colloquium on Magnetic Films and Surfaces 1994/08

  335. Effect of ultra clean sputtering process on magnetic anisotropy and intergranular coupling in CoNiCr and CoCrTa thin film recording media International-presentation

    T. Shimatsu, M. Imakawa, S. Ishibashi, M. Takahashi

    14th International Colloquium on Magnetic Films and Surfaces 1994/08

  336. Magnetic anisotropy and intergranular coupling in CoNiCrPt and CoCrTaPt thin film recording media International-presentation

    T. Shimatsu, D. D. Djayaprawira, S. Yokota, M. Takahashi, T. Wakiyama

    14th International Colloquium on Magnetic Films and Surfaces 1994/08

  337. EXPERIMENTAL CHARACTERIZATION OF MAGNETIC ANISOTROPY AND INTERGRANULAR INTERACTION FOR THIN FILM MEDIA International-presentation Invited

    T. Shimatsu, M. Takahashi, M. Suekane, M. Miyamura, K. Yamaguchi, H. Yamasaki

    The 3rd IUMRS International Conference on Advanced Materials 1993/08

  338. SOFT MAGNETISM OF NANOCRYSTALLINE FILMS -RECENT ADVANCES AND PHYSICS- International-presentation Invited

    M. Takahashi, T. SHIMATSU, H. Shoji

    The 6th International Conference on Ferrites 1992/09

  339. Magnetic evaluation of intergranular interaction for thin film media by rotational hysteresis loss analysis International-presentation

    M. Takahashi, T. Shimatsu, M. Suekane, M. Miyamura, K. Yamaguchi, H. Yamasaki

    International Conference on Magnetic Recording Media 1992/09

  340. SOFT MAGNETISM OF SPUTTERED FILMS WITH NANOCRYSTALS International-presentation Invited

    M. Takahashi, T. SHIMATSU

    2nd International Symposium on Physics of Magnetic Materials 1992/07

  341. Magnetic reversal mechanism evaluated by rotational hysteresis loss analysis for the thin film media International-presentation

    M. Takahashi, T. Shimatsu, M. Suekane, M. Miyamura, K. Yamaguchi, H. Yamasaki

    IEEE International Magnetics Conference, Intermag 1992 1992/04/13

  342. Magnetic Anisotropy and Initial Permeability for the Nanocrystalline Fe Based Sputtered Films International-presentation Invited

    M. Takahashi, T. SHIMATSU

    International Colloquium on Magnetic Films and Surfaces1991 1991/08

  343. SOFT MAGNETISM OF SPUTTERED Fe-SEMI METAL FILMS (NANOCRYSTALLINE EFFECT) International-presentation Invited

    M. Takahashi, T. SHIMATSU

    International Symposium on 3d Transition 1991/05

  344. SOFT MAGNETIC PROPERTIES AND MICROSTRUCTURES FOR THE Fe BASED SPUTTERED FILMS WITH HIGH Bs International-presentation Invited

    M. Takahashi, T. SHIMATSU

    Material Research Society 1991 Spring Meeting 1991/04

  345. Soft magnetism of nanocrystalline Fe based sputtered films with high Bs International-presentation Invited

    M. Takahashi, T. Shimatsu

    The European Magnetic Materials and Applications Conference 1991, EMMA ’91 1991/04

  346. SOFT MAGNETISM OF CRYSTALLINE Fe BASED ALLOY SPUTTERED FILMS International-presentation Invited

    M. Takahashi, T. SHIMATSU

    IEEE International Magnetics Conference, Intermag 1990 1990/04

  347. New thin film fabrication technique using a substrate excited by SAW International-presentation

    M. Takahashi, A. Fujita, T. Shimatsu, T. Wakiyama, J. Yamada, T. Shiba

    IEEE International Magnetics Conference, Intermag 1990 1990/04

  348. Soft magnetic properties of Fe-N and Fe-Si-N films sputtered in Ar + N2 plasma International-presentation

    M. Takahashi, H. Shoji, T. Shimatsu, H. Komaba, T. Wakiyama

    IEEE International Magnetics Conference, Intermag 1990 1990/04

  349. The effect of the local anisotropy fluctuation on the permeability for multilayered Co-Zr-Mo-Ni amorphous films International-presentation

    M. Takahashi, T. Shimatsu, Y. Shimada, T. Wakiyama

    International Symposium on Physics of Magnetic Materials 1987/04

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Research Projects 18

  1. 原子拡散接合法による室温接合技術の開発とデバイス形成への応用 Competitive

    2008/04 - Present

  2. Sputter film deposition process and microstructure of the deposited thin metal films Competitive

    1990/04 - Present

  3. High density perpendicular recording media Competitive

    1989/04 - Present

  4. Research of synthetic antiferromagnet for THz devices with Brillouin light scattering

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2021/04/01 - 2024/03/31

  5. 高光透過率で屈折率調整が可能な接合界面を有する完全無機の室温接合技術の開発

    島津 武仁

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2020/04/01 - 2023/03/31

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    令和2年度に引き続き,下地酸化膜を形成したウエハを,膜厚1 nm以下の金属薄膜を用いて真空中の原子拡散接合で実施した.令和2年度の結果から,IAD法で形成したSiO2下地膜を形成した石英ウエハに焦点を絞り,Ti,Zr,Nb,Hf,Al,Siを接合金属膜に用いた.接合界面の表面自由エネルギーγ(ブレード法により評価)の膜厚依存性を,熱処理温度の400℃までの範囲で実施した.また,これらの薄膜の接合界面における400~700 nmの波長範囲の光透過率・吸収率を評価し,光学特性の変化から,酸化の促進度合いを評価した.更に,TEMによる構造解析,ならびに,代表的なHfおよびAlについてはEELSによる解析を行った. その結果,下地SiO2膜からの乖離酸素により,これらの接合金属膜が酸化膜として接合界面に形成され,100%の光透過率(金属による光吸収の無い透過率)と2 J/m2を超える大きなγが得られる機構を解明した.特に,AlおよびSiを用いた接合では,膜厚を0.5 nm程度に設定することで,高バンドギャップを有するAl2O3およびSiO2のアモルファス膜による接合界面の形成に成功し,高輝度光に対する優れた耐光性が期待される. 最終年度には,高輝度光に対する耐光性に関する議論を進展させ,接合する光学ウエハの屈折率に合わせて,下地酸化膜および接合金属の種類を選択することで,完全透明で耐光性の優れた接合界面を有する完全無機の低温接合技術の提案を行う.

  6. 軟磁性微粒子の高周波帯域における磁気損失の起源解明とその設計手法の開発

    岡本 聡, 島津 武仁, 吉田 栄吉, 田丸 慎吾, 菊池 伸明

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東北大学

    2020/04/01 - 2023/03/31

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    5G通信における信号品質の確保やパワーデバイスのスイッチング周波数の高周波化に伴い、MHzからGHz帯域での軟磁性微粒子の磁気損失制御が重要な課題となっている。現状ではデバイス実装が先行しており、この周波数帯域における磁気損失に関する学術的理解はほとんど進んでいない。これまでは軟磁性微粒子の集合組織での特性が評価されてきたのみであるが、本研究においては、その構成要素である単一軟磁性微粒子の高周波特性を詳細に調べ、その磁気損失の起源解明を第一の目的としている。次に、この単一軟磁性微粒子の結果を集合組織に反映させる理論モデルを構築し、集合組織として所望の磁気損失特性を実現する設計手法の確立を第二の目的としている。本研究の成果は、今後の高速通信やパワーデバイスに大きく貢献するものである。 本年度はSPring-8のXMCD顕微計測を用いて単一扁平磁性粒子の磁化状態観察を行った。その結果、理想的な磁気Vortex構造ではないものの、flux closure状態が複数形成されており、前年度までの低周波領域と高周波領域の吸収ピークに対応する磁化状態であることを確認した。次にトランス結合型透磁率計を用いて、扁平磁性粒子の透磁率スペクトルの粒子サイズ依存性を詳細に計測した。その結果、これまでの低周波領域と高周波領域の吸収ピークだけでなく、中間周波数領域にも吸収ピークが存在していることが分かった。低周波領域の吸収ピークはVortexコアの周回運動で、高周波領域の吸収ピークは磁気Vortex周辺部の一斉励起であるflux closureモードで説明できるが、それに加えて各flux closure状態における一斉励起モードで中間周波数領域の吸収ピークが説明できることが分かった。

  7. Engineering technology for high frequency spin dynamics

    Okamoto Satoshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2017/04/01 - 2020/03/31

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    High frequency spin dynamics has been intensely studied in many fields such as spintronics and magnetic recording. The main purpose of this study has been to develop engineering technology of high frequency spin dynamics. As an example of this issue, we have investigated the next-generation magnetic recording technology based on high frequency spin dynamics using samples with various inter-layer and inter-granular exchange coupling. Consequently, we have successfully found that the magnetization reversal behavior under the application of microwave fields can be well controlled by varying the magnetic coupled mode of the sample.

  8. Development of ultimate diffraction grating of high diffraction order with high dispersion

    Ebizuka Noboru, SHIMATSU Takehito, UOMOTO Miyuki, KAJIWARA Ken, OKUMURA Toshio, TANAKA Ichi, HATTORI Takashi, OZAKI Shinobu, KIRINO Okiharu, OKAMOTO Takayuki, HOSOBATA Takuya, TAKEDA Masahiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Institute of Physical and Chemical Research

    2015/04/01 - 2017/03/31

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    A volume binary (VB) grating of silicon with a high aspect ratio which functions as a QB grating was prototyped by cycle etching of silicon, formation and removal of oxide layer. This silicon VB grating has an extremely smooth optical surface with little scattering even in visible light. The prototype for the reflector facet transmission (RFT) grating was fabricated by the replication from the mold of the grating with an acute vertex angle. The diffraction efficiency of the grating was about 45 to 50%. The Quasi-Bragg (QB) immersion grating was prototyped by bonding a QB grating cut at 30 degrees with a prism and a surface reflection mirror, and its function was verified.

  9. Development of high-efficiency techniques of microwave-assisted magnetization switching

    Okamoto Satoshi, SATO KIMINORI

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2014/04/01 - 2017/03/31

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    In this study, we have investigated various approaches to improve the efficiency of microwave-assisted magnetization switching effect. First, we successfully developed novel quantitative evaluation methods for large cone angle magnetization precession in a nano-scale magnetic dot based on anomalous Hall effect (AHE) and x-ray magnetic circular dichroism (XMCD) detection techniques. Then, we studied the microwave-assisted magnetization switching against various factors, such as the interlayer coupling in a dot composed of two magnetic layers, the effective gyromagnetic ratio in ferromagnetic materials, and inter-grain magnetic interaction in granular magnetic films. It is well verified that these factors can be significantly modify the microwave-assisted switching behavior. These findings are beneficial for practical application of the microwave-assisted magnetization switching.

  10. Magnetization dynamics in microstructed NdFeB single dot

    KITAKAMI Osamu, OKAMOTO Satoshi, KIKUCHI Nobuaki, SHIMATSU Takehito, YANAGIHARA Mihiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2012/04/01 - 2015/03/31

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    The aim of this study is to elucidate the magnetization dynamics of single NdFeB dot. By combining our highly sensitive Hall effect magnetometry with the newly developed large amplitude ns pulse field generator, we have traced magnetization reversal process in single dot after application of slowly varying dc fields and ns pulse fields. Nucleation of reversed domains of about 100 nm in diameter takes place at same points for both cases, but the significant difference is observed in their following expansion. In the dc field case, neighboring nucleated domains are linked to each other, resulting in a maze-like domain structure, while nucleated domains tend to expand isotropically in the pulse field case. Such difference depending on application fields can be explained by assuming multiple energy barriers for magnetization reversal. This result leads us to believe that elimination of defects or something which lower the energy barrier contributes to the enhancement of coercivity.

  11. New Method for Room Temperature Bonding at Ambient Gas

    SUGA Tadatomo, SHIMATSU Takehito, HIGURASHI Eiji

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: The University of Tokyo

    2011/04/01 - 2014/03/31

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    This research aims to establish a method for room temperature bonding in ambient gas as a new approach to industrial and volume production for devices using the surface activated bonding method which has been developed in advance in Japan. For thie purpose, the fundamental knowledge for bonding and it mechanism was accumulated and compiled systematically. Based on those research results, new processes including Ar-ion bombardment, Si-nano adhesion layer, atom diffusion bonding, air-plasma treatment, hydrogen radiacal treatment, and their combined process were proposed to demostrate the feasibility of the method for room temperature bonding. During the research also a new finding was done that shows the possibility of bonding polymers, glasses, and SiC using Si-Fe nano-adhesion layer, which was not planned in the original research proposal. Finally it has been shown that the proposed process can be applied successfully to integrating optical microsystems and sealing micro-devices.

  12. Magnetization switching under the assistance of rf field and its feasiility for high density recording

    OKAMOTO Satoshi, KIKUCHI Nobuaki, SHIMATSU Takehito, KATO Takeshi

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2011/04/01 - 2014/03/31

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    In this study, magnetization switching behaviors of perpendicular magnetic nanodots under the rf field have been investigated and discussed the technological feasibility for the future ultra-high density magnetic recording. Even for the dot 10 times larger than the exchange length, it is reveled that the magnetization switching caused by the precessional motion of whole spins inside the dot is realized. The switching field which is the dc field required for the magnetization switching proportionally decreases with increasing the frequency of the rf field. This switching behavior is well understood by the frequency dispersion of the eignemode of precessional motion which strongly depends on the dot size. These results will provide the novel recording technology which possesses very good controllability.

  13. Study on giant magnetic anisotropy of thin films for magnetic recording

    KITAKAMI Osamu, OKAMOTO Satoshi, KIKUCHI Nobuaki, SHIMATSU Takehito, YANAGIHARA Mihiro

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (B)

    Institution: Tohoku University

    2007 - 2008

  14. Spin-cluster recording media for high-density magnetic recording.

    NAKAMURA Yoshihisa, WATANABE Isao, SHIMATSU Takehito, MURAOKA Hiroaki

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A).

    Institution: Tohoku University

    1999 - 2000

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    Magnetic and structural properties of perpendicular recording media required to achieve both high thermal stability and low-noise performance are discussed. Moreover magnetic properties and recording performances of granular-amorphous hybrid media are examined. (1) The angular dependence of remanence coercivity in CoCr based granular-type of perpendicular media indicated that magnetization reversal occurs by coherent rotation, and validates the use of an analysis based on the Stoner-Wohlfarth model. (2) Experimental and theoretical analysis revealed that for CoCr based granular-type of perpendicular media of 20 nm thickness having the thermal stability factor K_uV/(kT)〜80, the maximum achievable value of the ratio of remanence coercivity to anisotropy field of grains, H_r/H_k, is 〜0.35. Furthermore, in order to realize a large squareness M_r/M_s of nearly 1.0, which is required to resist the thermal agitation effect at low recording density, we find that the value of perpendicular anisotropy, K_w is needs to be more than 3 times larger than the demagnetizing energy 2πM_s^2. X-ray diffraction patterns suggested that the suppression of structural imperfections in the hcp structure, particularly in the initial film growth, is the key issue to induce larger K_u value in the CoCr based granular-type of media. (3) CoPrTb nucleation-type of amorphous film showed a large K_u value of 4x10^6 erg/cm^3 or more even at thin film of 10 nm. However, a large remanence coercivity was not successfully driven in CoPrTb single layer films. (4) The ratio of signal to media-nose S/Nm of granular-amorphous hybrid media was about 10 dB higher than that of CoCr based granular-type of media (at 300 kFRPI). Moreover, the hybrid media showed extremely high thermal stability.

  15. Research on extremely high capacity storage systems by perpendicular hard disk drives

    NAKAMURA Yoshihisa, SHIMATSU Takehito, MURAOKA Hiroaki, SUGITA Yutaka

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (A)

    Institution: TOHOKU UNIVERSITY

    1997 - 1999

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    High capacity storage system using perpendicular magnetic recording was investigated in order to give a solution for the bottle neck of capacity and data transfer rate of storage systems in multi-media and high speed network technology. In particular, evaluation of error rate for perpendicular magnetic recording system including signal processing was one of the most crucial issue. First heads and disks for experiments were prepared. A thin-film single-pole head on a flying slider, which could be adopted to practical application, was developed. Using the head as a write for perpendicular double layer disks, adaptability of MR head was investigated. Theoretical expression for the MR head response was derived to estimate read performance for any given head and disk. Next, read channel for the perpendicular storage was studied. We established a differential equalizer which transformed perpendicular step-like response into single peaking pulse and PRML error rate analyzer for the perpendicular head/disk system. Sufficient error rate at high densities more than 300 kFRPI was demonstrated. The results indicated that the single-pole head and double layer media with an MR head could be used in a practical high density storage systems. In order to increase attainable areal density, signal SNR limitation was explored. Theoretical approach employing Voronoi cell modeling for media indicated that the limitation was governed by media noise, which originated from finite size of magnetic structure of the perpendicular media. Therefore, it was predicted that fine magnetic structure brought higher signal SNR, i.e., better error rate at high densities. By above mentioned studies, potential of perpendicular magnetic recording for areal density of 100 Gbits/inchィイD12ィエD1 has been demonstrated in association with high resolution MR head and low noise perpendicular double layer media.

  16. 低交換相互作用によるナノスピンクラスターを利用した超高密度磁気記録薄膜媒体の研究

    島津 武仁

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 奨励研究(A)

    Institution: 東北大学

    1994 - 1994

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    (Co_<92.5-X>Ni_XCr_<7.5>)_<100-Y>Pt_Y(X=10〜40,Y=0〜15)を磁性層として作製した薄膜媒体の、結晶磁気異方性、交換定数および粒間相互作用について検討し、ナノスピンクラスターを利用した超高密度磁気記録媒体の実現に関する基礎物性的な検討を行なった。その結果、X=25〜30at%程度のNi組成域においてY=9at%程度までPt量を増加させることで、結晶磁気異方性は2倍程度増加し、粒間の交換相互作用は1/2程度まで低減することが、回転ヒステリシス損失およびΔMプロットの測定より明らかとなった。特にPtの添加による交換相互作用の低下は真性的な交換定数の低下に主に起因しており、本材料系を用いた場合には、9at%以上のPtを添加した組成域がナノスピンクラスターの形成に適していることが明らかとなった。スピンクラスターの大きさについて磁気的に評価するため、本材料系を始めとする各種のCo基薄膜媒体について、薄膜磁気ヘッドを用いたDC erased noise量の計測を行なった。その結果、結晶粒間の交換相互作用の低減にともないDC erased noiseの極大値が低減し、スピンクラスターの大きさが小さくなっていることが明らかとなった。しかし、CoNiCrPt材料系を用いた場合には、Ptの添加により交換相互作用が低下するものの、結晶粒の磁化容易軸(c軸)が膜面内から膜法線方向へと徐々に変化してしまい、膜面内の磁化機構が変化してしまうことが明らかとなった。本材料系を用いたナノスピンクラスターの安定形成には、c軸を膜面に平行に配向させ、さらに、結晶粒径を低減することが、今度の課題となることを明らかにした。

  17. スパッタ薄膜記録媒体の非線形磁化反転機構

    島津 武仁

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 奨励研究(A)

    Institution: 東北大学

    1990 - 1990

  18. The Study of Electronic Materials in the Double Hexagonal Co-Fe Alloy System with the Easy Basal-Plane and Fine Magnetic Domains

    WAKIYAMA Tokuo, SHIMATSU Takehito, TANAKA Toshirou, TAKAHASHI Migaku, MIYAZAKI Terunobu

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for General Scientific Research (B)

    Institution: Tohoku University

    1989 - 1990

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    1. Tthe roll reduction and concentration dependences of the uniaxial magnetic anisotropy induced by cold-rolling, K_<ur>, were investigated for HCP and DHCP Co-Fe alloys. The maximum value of Kur was 3X10 ^5 erg/cm^3 at 10-20% roll reduction for Co and Co-3.0% Fe. 2. The easy direction of the uniaxial anisotropy was perpendicular (K_<ur><0) and parallel (K_<ur>>0) to the rolling direction for the alloys containing less than 1.2%Fe (HCP phase) and more than 1.2% Fe (DHCP phase) at room temperature, respectively. 3. The Fe concentration dependence of the uniaxial magnetic anisotropy induced by cold rolling is quite similar to that by magnetic annealing observed in HCP and DHCP Co-Fe alloys. Both induced magnetic anisotropies are believed to be associated with the magnetocrystalline anisotropy and the produced texture. 4. The dependence of soft magnetic properties on the thickness and composition was investigated for sputtered Fe-Co/ZnO multilayers. The corrcive force corresponds with the a c permeability (10MHz), which shows the peaks (about 900 and about 700) around 20 and 84 wt% Co, respectively. 5. The dependence of soft magnetic properties on the composition and annealing temperature was studied for sputtered (Fe _<1-x> Co_x) _<1-y> Nb_y (0= x =1.0, 0= y =0.2 in weight fraction) films. The corrcive force of the films annealed at 773K for 3600S exhibits a minimum of 400 A/m around y=0.05 and X=0.3-0.8. The corresponding permeability and saturation magnetic flux density are 800 and 2T, respectively.

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Social Activities 5

  1. 文部科学省指定SSH(スーパーサイエンスハイスクール)事業

    2018/09/08 -

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