Details of the Researcher

PHOTO

Masahito Tsujikawa
Section
Research Institute of Electrical Communication
Job title
Assistant Professor
Degree

Research Areas 1

  • Nanotechnology/Materials / Structural and functional materials /

Papers 64

  1. Metastable body-centered cubic CoMnFe alloy films with perpendicular magnetic anisotropy for spintronics memory

    Deepak Kumar, Mio Ishibashi, Tufan Roy, Masahito Tsujikawa, Masafumi Shirai, Shigemi Mizukami

    Science and Technology of Advanced Materials　2024/11/13

    Publisher: Informa UK Limited

    DOI： 10.1080/14686996.2024.2421746 　

    ISSN： 1468-6996

    eISSN： 1878-5514

  2. Ballistic spin-transport properties of magnetic tunnel junctions with MnCr-based ferrimagnetic quaternary Heusler alloys

    Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

    Physical Review Materials　7　(10)　2023/10/25

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevmaterials.7.104410 　

    eISSN： 2475-9953

  3. Fabrication of L10-ordered FeNi films by denitriding FeNiN(001) and FeNiN(110) films

    Keita Ito, Takumi Ichimura, Masahiro Hayashida, Takahiro Nishio, Sho Goto, Hiroaki Kura, Ryusei Sasaki, Masahito Tsujikawa, Masafumi Shirai, Tomoyuki Koganezawa, Masaki Mizuguchi, Yusuke Shimada, Toyohiko J. Konno, Hideto Yanagihara, Koki Takanashi

    Journal of Alloys and Compounds　946　169450-169450　2023/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.jallcom.2023.169450 　

    ISSN： 0925-8388

  4. Anisotropic magnetism and electronic structure of trigonal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuAl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> single crystals

    Santanu Pakhira, Asish K. Kundu, Farhan Islam, M. A. Tanatar, Tufan Roy, Thomas Heitmann, T. Yilmaz, E. Vescovo, Masahito Tsujikawa, Masafumi Shirai, R. Prozorov, David Vaknin, D. C. Johnston

    Physical Review B　107　(13)　2023/04/28

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.107.134439 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  5. Anomalous Nernst effect in epitaxially grown Fe4-xNixN films

    Weida Yin, Keita Ito, Yusuke Tsubowa, Masahito Tsujikawa, Masafumi Shirai, Koki Takanashi

    AIP ADVANCES　13　(2)　2023/02

    DOI： 10.1063/9.0000564 　

    eISSN： 2158-3226

  6. Electronic and magnetic properties of the topological semimetal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SmMg</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

    Asish K. Kundu, Santanu Pakhira, Tufan Roy, T. Yilmaz, Masahito Tsujikawa, Masafumi Shirai, E. Vescovo, D. C. Johnston, Abhay N. Pasupathy, Tonica Valla

    Physical Review B　106　(24)　2022/12/19

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.106.245131 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  7. Compositional dependence of anisotropic magnetoresistance effects in Weyl semimetal Co2MnAl Heusler alloy epitaxial thin films Peer-reviewed

    T. Sato, S. Kokado, H. Shinya, M. Tsujikawa, A. Miura, S. Kosaka, T. Ogawa, M. Shirai, M. Tsunoda

    Journal of Applied Physics　132　(22)　223907-1-223907-7　2022/12/12

    Publisher: AIP Publishing

    DOI： 10.1063/5.0128562 　

    ISSN： 0021-8979

    eISSN： 1089-7550

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    Anisotropic magnetoresistance (AMR) effect on a Weyl semimetal Co2MnAl Heusler alloy was experimentally and theoretically investigated by changing the Co content, the direction of electric current against the crystal axis, and the measurement temperature. The experimentally fabricated Co2MnAl thin films epitaxially grown on a MgO single-crystal substrate showed the positive AMR ratios independent of the Co content, the direction of electric current, and the measurement temperature. The AMR ratios for the direction of electric current along Co2MnAl[100] were larger than those along Co2MnAl[110]. The maximum AMR ratios for Co2MnAl[100] were 0.576% at 5 K and 0.349% at 300 K for a Co content of 47 at. %, which is close to the stoichiometric composition. Furthermore, the theoretical calculations of AMR ratios based on the s-d scattering process of the electrons at the Fermi energy, including the information on the density of states (DOS) obtained from first-principles calculations, exhibited trends similar to the experimental results. Compared with the AMR results of Co2MnGa[110], we found that the magnitude relation between the partial DOS of the ε and γ orbitals of the d state of Co atoms determined the sign of the AMR ratios. These results suggest that the AMR effect of Weyl semimetal Co2MnAl can be elucidated by the s-d scattering process of the electrons.

  8. Topological electronic structure of YbMg2Bi2 and CaMg2Bi2

    Asish K. Kundu, Tufan Roy, Santanu Pakhira, Ze-Bin Wu, Masahito Tsujikawa, Masafumi Shirai, D. C. Johnston, Abhay N. Pasupathy, Tonica Valla

    npj Quantum Materials　7　(1)　2022/06/23

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s41535-022-00474-2 　

    eISSN： 2397-4648

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    Abstract Zintl compounds have been extensively studied for their outstanding thermoelectric properties, but their electronic structure remains largely unexplored. Here, we present a detailed investigation of the electronic structure of the isostructural thermopower materials YbMg2Bi2 and CaMg2Bi2 using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). The ARPES results show a significantly smaller Fermi surface and Fermi velocity in CaMg2Bi2 than in YbMg2Bi2. Our ARPES results also reveal that in the case of YbMg2Bi2, Yb-4f states reside well below the Fermi level and likely have a negligible impact on transport properties. To properly model the position of 4f-states, as well as the overall electronic structure, a Hubbard U at the Yb sites and spin-orbit coupling (SOC) have to be included in the DFT calculations. The theoretical results reveal that both materials belong to a Z2 topological class and host topological surface states around EF. Due to the intrinsic hole doping, the topological states reside above the Fermi level, inaccessible by ARPES. Our results also suggest that in addition to SOC, vacancies and the resulting hole doping play an important role in the transport properties of these materials.

  9. Electron Correlation Enhances Orbital Polarization at a Ferromagnetic Metal/Insulator Interface: Depth-Resolved X-ray Magnetic Circular Dichroism and First-Principles Study

    Shoya Sakamoto, Masahito Tsujikawa, Masafumi Shirai, Kenta Amemiya, Shinji Miwa

    ACS Applied Electronic Materials　4　(4)　1794-1799　2022/04

    DOI： 10.1021/acsaelm.2c00049 　

    eISSN： 2637-6113

  10. Structure and magnetism in metastable bcc Co1−xMnx epitaxial films

    Kazuma Kunimatsu, Tufan Roy, Jun Okabayashi, Tomoki Tsuchiya, Tomohiro Ichinose, Masahito Tsujikawa, Masafumi Shirai, Shigemi Mizukami

    Journal of Magnetism and Magnetic Materials　548　168841-168841　2022/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jmmm.2021.168841 　

    ISSN： 0304-8853

  11. Synthesis and magnetic properties of tetragonally ordered Fe2Ni2N alloy using topotactic nitriding reaction

    Sho Goto, Hiroaki Kura, Masahito Tsujikawa, Masafumi Shirai, Keita Ito, Takashi Suemasu, Koki Takanashi, Hideto Yanagihara

    JOURNAL OF ALLOYS AND COMPOUNDS　885　2021/12

    DOI： 10.1016/j.jallcom.2021.161122 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  12. Lattice Softening in Metastable bcc CoxMn100−x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction

    Kevin Elphick, Kenta Yoshida, Tufan Roy, Tomohiro Ichinose, Kazuma Kunimatsu, Tomoki Tsuchiya, Kazuya Z. Suzuki, Masahito Tsujikawa, Yasuyoshi Nagai, Shigemi Mizukami, Masafumi Shirai, Atsufumi Hirohata

    Physical Review Applied　16　(5)　2021/11/30

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevapplied.16.054052 　

    eISSN： 2331-7019

  13. IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions:A first-principles study

    Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

    Journal of Physics D: Applied Physics　2021/11/26

    Publisher: IOP Publishing

    DOI： 10.1088/1361-6463/ac3dab 　

    ISSN： 0022-3727

    eISSN： 1361-6463

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    <title>Abstract</title> We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles calculations from the perspective of their application as the electrode materials of MgO-based MTJs. These materials have highly spin-polarized conduction electrons with partially occupied Δ1 band, which is important for coherent tunneling in parallel magnetization configuration. The Curie temperatures of IrCrMnAl and IrCrMnGa are very high (above 1300 K) as predicted from mean-field-approximation. The stability of ordered phase against various antisite disorders has been investigated. We discuss here the effect of ``spin-orbit-coupling'' on the electronic structure around Fermi level. Further, we investigate the electronic structure of IrCrMnZ/MgO heterojunction along (001) direction. IrCrMnAl/MgO and IrCrMnGa/MgO maintain half-metallicity even at the MgO interface, with no interfacial states at/around Fermi level in the minority-spin channel. Large majority-spin conductance of IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa is reported from the calculation of ballistic spin-transport property for parallel magnetization configuration. We propose IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa as promising MTJs with a weaker temperature dependence of tunneling magnetoresistance ratio, owing to their very high Curie temperatures.

  14. Structural and magnetic properties of CoIrMnAl equiatomic quaternary Heusler alloy epitaxial films designed using first-principles calculations

    Ren Monma, Tufan Roy, Kazuya Suzuki, Tomoki Tsuchiya, Masahito Tsujikawa, Shigemi Mizukami, Masafumi Shirai

    JOURNAL OF ALLOYS AND COMPOUNDS　868　2021/07

    DOI： 10.1016/j.jallcom.2021.159175 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  15. Ab initio study of electronic and magnetic properties of Mn(2)RuZ/MgO (001) heterojunctions (Z = Al, Ge)

    Tufan Roy, Masahito Tsujikawa, Masafumi Shirai

    JOURNAL OF PHYSICS-CONDENSED MATTER　33　(14)　2021/04

    DOI： 10.1088/1361-648X/abdffc 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  16. Observation of inverse magnetocaloric effect in magnetic-field-induced austenite phase of Heusler alloys Ni50−xCoxMn31.5Ga18.5 (x=9 and 9.7)

    T. Kihara, T. Roy, X. Xu, A. Miyake, M. Tsujikawa, H. Mitamura, M. Tokunaga, Y. Adachi, T. Eto, T. Kanomata

    Physical Review Materials　5　(3)　2021/03/23

    DOI： 10.1103/physrevmaterials.5.034416 　

    eISSN： 2475-9953

  17. Enhancement of the anomalous Nernst effect in Ni/Pt superlattices

    T. Seki, Y. Sakuraba, K. Masuda, A. Miura, M. Tsujikawa, K. Uchida, T. Kubota, Y. Miura, M. Shirai, K. Takanashi

    Physical Review B　103　(2)　2021/01/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.103.l020402 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  18. Magnetic tunnel junctions with metastable bcc Co3Mn electrodes Peer-reviewed

    Kazuma Kunimatsu, Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick, Tomohiro Ichinose, Masahito TSUJIKAWA, Atsufumi HIROHATA, Masafumi Shirai, Shigemi Mizukami

    Applied Physics Express　2020/07/22

    Publisher: IOP Publishing

    DOI： 10.35848/1882-0786/aba883 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  19. Perpendicularly magnetized Ni/Pt (001) epitaxial superlattice

    T. Seki, M. Tsujikawa, K. Ito, K. Uchida, H. Kurebayashi, M. Shirai, K. Takanashi

    PHYSICAL REVIEW MATERIALS　4　(6)　2020/06

    DOI： 10.1103/PhysRevMaterials.4.064413 　

    ISSN： 2475-9953

  20. Experimental inspection of a computationally-designed NiCrMnSi Heusler alloy with high Curie temperature Peer-reviewed

    Yuta Onodera, Kelvin Elphick, Takuro Kanemura, Tufan Roy, Tomoki Tsuchiya, Masahito Tsujikawa, Kenta Yoshida, Yasuyoshi Nagai, Shigemi Mizukami, Atsufumi Hirohata, Masafumi Shirai

    Japanese Journal of Applied Physics (accepted)　59　(7)　073003-073003　2020/06

    Publisher: IOP Publishing

    DOI： 10.35848/1347-4065/ab9c75 　

    ISSN： 0021-4922

    eISSN： 1347-4065

  21. Theoretical design of tetragonal rare-earth-free alloys with high magnetisation and high magnetic anisotropy

    Masahito Tsujikawa, Yuito Mitsuhashi, Masafumi Shirai

    Japanese Journal of Applied Physics　59　(5)　2020/05/07

    Publisher: Institute of Physics Publishing

    DOI： 10.35848/1347-4065/ab87dd 　

    ISSN： 1347-4065 0021-4922

  22. Off-stoichiometry effect on magnetic damping in thin films of Heusler alloy Co2MnSi

    Ting Li, Wei Yan, Xinhui Zhang, Bing Hu, Kidist Moges, Tetsuya Uemura, Masafumi Yamamoto, Masahito Tsujikawa, Masafumi Shirai, Yoshio Miura

    Physical Review B　101　(17)　2020/05/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.101.174410 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  23. Ab-initio study of electronic and magnetic properties of CoIrMnZ (Z= Al, Si, Ga, Ge) Heusler alloys

    Tufan Roy, Masahito Tsujikawa, Takuro Kanemura, Masafumi Shirai

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　498　2020/03

    DOI： 10.1016/j.jmmm.2019.166092 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  24. Voltage-controlled magnetic anisotropy in an ultrathin Ir-doped Fe layer with a CoFe termination layer

    Takayuki Nozaki, Masaki Endo, Masahito Tsujikawa, Tatsuya Yamamoto, Tomohiro Nozaki, Makoto Konoto, Hiroyuki Ohmori, Yutaka Higo, Hitoshi Kubota, Akio Fukushima, Masanori Hosomi, Masafumi Shirai, Yoshishige Suzuki, Shinji Yuasa

    APL MATERIALS　8　(1)　2020/01

    DOI： 10.1063/1.5132626 　

    ISSN： 2166-532X

  25. Positive Weiss Temperature in Layered Antiferromagnetic FeNiN for High-Performance Permanent Magnets

    Sho Goto, Hiroaki Kura, Hideto Yanagihara, Eiji Kita, Masahito Tsujikawa, Ryusei Sasaki, Masafumi Shirai, Yasuhiro Kobayashi, Takashi Honda, Kanta Ono

    ACS Applied Nano Materials　2　(11)　6909-6917　2019/11/22

    Publisher: American Chemical Society (ACS)

    DOI： 10.1021/acsanm.9b01405 　

    ISSN： 2574-0970

    eISSN： 2574-0970

  26. Signs of anisotropic magnetoresistance in Co2MnGa Heusler alloy epitaxial thin films based on current direction Peer-reviewed

    Takashi Sato, Satoshi Kokado, Masahito Tsujikawa, Tomoyuki Ogawa, Satoru Kosaka, Masafumi Shirai, Masakiyo Tsunoda

    Applied Physics Express　12　(10)　103005-1　2019/09

    DOI： 10.7567/1882-0786/ab42b4 　

  27. Microscopic origin of large perpendicular magnetic anisotropy in an FeIr/MgO system Peer-reviewed

    Shinji Miwa, Takayuki Nozaki, Masahito Tsujikawa, Motohiro Suzuki, Takuya Tsukahara, Takeshi Kawabe, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

    Physical Review B　99　(18)　2019/05/16

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.99.184421 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  28. Recent Progress in the Voltage-Controlled Magnetic Anisotropy Effect and the Challenges Faced in Developing Voltage-Torque MRAM. Peer-reviewed

    Nozaki T, Yamamoto T, Miwa S, Tsujikawa M, Shirai M, Yuasa S, Suzuki Y

    Micromachines　10　(5)　2019/05

    DOI： 10.3390/mi10050327 　

    ISSN： 2072-666X

  29. Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change Peer-reviewed

    Y. Jibiki, M. Goto, M. Tsujikawa, P. Risius, S. Hasebe, X. Xu, K. Nawaoka, T. Ohkubo, K. Hono, M. Shirai, S. Miwa, Y. Suzuki

    Applied Physics Letters　114　(8)　082405-1-082405-5　2019/03

    DOI： 10.1063/1.5082254 　

    ISSN： 0003-6951

  30. Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy Peer-reviewed

    Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick, Jun Okabayashi, Lakhan Bainsla, Tomohiro Ichinose, Kazuya Z. Suzuki, Masahito Tsujikawa, Masafumi Shirai, Atsufumi Hirohata, Shigemi Mizukami

    Physical Review Materials　3　(8)　084403　2019

    DOI： 10.1103/PhysRevMaterials.3.084403 　

    ISSN： 2475-9953

  31. Perpendicular magnetic anisotropy and its electric-field-induced change at metal-dielectric interfaces Peer-reviewed

    Miwa Shinji, Suzuki Motohiro, Tsujikawa Masahito, Nozaki Takayuki, Nakamura Tetsuya, Shirai Masafumi, Yuasa Shinji, Suzuki Yoshishige

    Journal of Physics D-Applied Physics　52　(6)　2019

    DOI： 10.1088/1361-6463/aaef18 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  32. Electronic structures of MgO/Fe interfaces with perpendicular magnetization revealed by hard X-ray photoemission with an applied magnetic field Peer-reviewed

    S. Ueda, M. Mizuguchi, M. Tsujikawa, M. Shirai

    Science and Technology of Advanced Materials　2019

    DOI： 10.1080/14686996.2019.1633687 　

  33. Low magnetic damping for equiatomic CoFeMnSi Heusler alloy Peer-reviewed

    L. Bainsla, R. Yilgin, M.Tsujikawa, K. Z. Suzuki, M. Shirai, S. Mizukami

    Journal of Physics D: Applied Physics　51　(49)　495001　2018/12

    DOI： 10.1088/1361-6463/aae4ef 　

    ISSN： 0022-3727

  34. Pressure effect on the magnetic properties of the half-metallic Heusler alloy Co2TiSn Peer-reviewed

    Iduru Shigeta, Yutaro Fujimoto, Ryutaro Ooka, Yuya Nishisako, Masahito Tsujikawa, Rie Y. Umetsu, Akiko Nomura, Kunio Yubuta, Yoshio Miura, Takeshi Kanomata, Masafumi Shirai, Jun Gouchi, Yoshiya Uwatoko, Masahiko Hiroi

    Physical Review B　97　(10)　2018/03/21

    DOI： 10.1103/PhysRevB.97.104414 　

    ISSN： 2469-9969 2469-9950

    eISSN： 2469-9969

  35. Magnetic tunnel junctions with an equiatomic quaternary CoFeMnSi Heusler alloy electrode Peer-reviewed

    Lakhan Bainsla, Kazuya Z. Suzuki, Masahito Tsujikawa, Hiroki Tsuchiura, Masafumi Shirai, Shigemi Mizukami

    Applied Physics Letters　112　(5)　2018/01/29

    DOI： 10.1063/1.5002763 　

    ISSN： 0003-6951

  36. Synthesis of metastable B2-type Fe-Sn alloy epitaxial films and study of their magnetic properties Peer-reviewed

    Goto Yuki, Araki Masato, Takahashi Nozomi, Yanase Takashi, Shimada Toshihiro, Tsujikawa Masahito, Shirai Masafumi, Kamimaki Akira, Iihama Satoshi, Mizukami Shigemi, Nagahama Taro

    Japanese Journal of Applied Physics　57　(12)　2018

    DOI： 10.7567/JJAP.57.120302 　

  37. Electric-field-induced changes of magnetic moments and magnetocrystalline anisotropy in ultrathin cobalt films Peer-reviewed

    Takeshi Kawabe, Kohei Yoshikawa, Masahito Tsujikawa, Takuya Tsukahara, Kohei Nawaoka, Yoshinori Kotani, Kentaro Toyoki, Minori Goto, Motohiro Suzuki, Tetsuya Nakamura, Masafumi Shirai, Yoshishige Suzuki, Shinji Miwa

    Physical Review B　96　(22)　2017/12/26

    DOI： 10.1103/physrevb.96.220412 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  38. Highly efficient voltage control of spin and enhanced interfacial perpendicular magnetic anisotropy in iridium-doped Fe/MgO magnetic tunnel junctions Peer-reviewed

    Takayuki Nozaki, Anna Koziol-Rachwal, Masahito Tsujikawa, Yoichi Shiota, Xiandong Xu, Tadakatsu Ohkubo, Takuya Tsukahara, Shinji Miwa, Motohiro Suzuki, Shingo Tamaru, Hitoshi Kubota, Akio Fukushima, Kazuhiro Hono, Masafumi Shirai, Yoshishige Suzuki, Shinji Yuasa

    NPG ASIA MATERIALS　9　2017/12

    DOI： 10.1038/am.2017.204 　

    ISSN： 1884-4049

    eISSN： 1884-4057

  39. Emergence of undulating surface band upon oxygen adsorption of Fe thin flim on W(110) Peer-reviewed

    Seigo Souma, Kohei Honma, Takafumi Sato, Masahito Tsujikawa, Masafumi Shirai, Takashi Takahashi

    APPLIED PHYSICS LETTERS　111　(24)　2017/12

    DOI： 10.1063/1.5017484 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  40. Magnetic Anisotropy and Damping for Monolayer-Controlled Co | Ni Epitaxial Multilayer Peer-reviewed

    Takeshi Seki, Junpei Shimada, Satoshi Iihama, Masahito Tsujikawa, Tomoyuki Koganezawa, Akihiro Shioda, Takayuki Tashiro, Weinan Zhou, Shigemi Mizukami, Masafumi Shirai, Koki Takanashi

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　86　(7)　2017/07

    DOI： 10.7566/JPSJ.86.074710 　

    ISSN： 0031-9015

  41. Voltage controlled interfacial magnetism through platinum orbits Peer-reviewed

    Shinji Miwa, Motohiro Suzuki, Masahito Tsujikawa, Kensho Matsuda, Takayuki Nozaki, Kazuhito Tanaka, Takuya Tsukahara, Kohei Nawaoka, Minori Goto, Yoshinori Kotani, Tadakatsu Ohkubo, Frederic Bonell, Eiiti Tamura, Kazuhiro Hono, Tetsuya Nakamura, Masafumi Shirai, Shinji Yuasa, Yoshishige Suzuki

    NATURE COMMUNICATIONS　8　2017/06

    DOI： 10.1038/ncomms15848 　

    ISSN： 2041-1723

  42. Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism Peer-reviewed

    Jun Okabayashi, Tomohiro Koyama, Motohiro Suzuki, Masahito Tsujikawa, Masafumi Shirai, Daichi Chiba

    SCIENTIFIC REPORTS　7　2017/04

    DOI： 10.1038/srep46132 　

    ISSN： 2045-2322

  43. Current perpendicular-to-plane giant magnetoresistance devices using half-metallic Co2Fe0.4Mn0.6Si electrodes and a Ag–Mg spacer Peer-reviewed

    T Kubota, Y Ina, M Tsujikawa, S Morikawa, H Narisawa, Z Wen, M Shirai, K Takanashi

    Journal of Physics D: Applied Physics　50　(1)　014004-1-014004-8　2016/11/24

    DOI： 10.1088/1361-6463/50/1/014004 　

  44. 20pAU-2 First-principles calculation of spin-dependent transport in Co_2MnSi/Ag-Mg/Co_2MnSi GMR devices

    Morikawa S., Tsujikawa M., Abe K., Shirai M.

    Meeting Abstracts of the Physical Society of Japan　71　1184-1184　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1184 　

    ISSN： 2189-079X

  45. 19aPS-11 Atomic arrangement and electronic state of Mn_2CoGa Heusler alloy

    Umetsu R.Y., Saito K., Tsujikawa M., Ono K., Ishigaki T., Shirai M.

    Meeting Abstracts of the Physical Society of Japan　71　1018-1018　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1018 　

    ISSN： 2189-079X

  46. 19aCG-2 Oxygen adsorption effect on surface electronic band structure in Fe(110) thin film : High-resolution ARPES

    Souma S., Honma K., Sugawara K., Sato T., Tsujikawa M., Shirai M., Takahashi T.

    Meeting Abstracts of the Physical Society of Japan　70　967-967　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_967 　

    ISSN： 2189-079X

  47. Magnetic anisotropy in Ta/CoFeB/MgO investigated by x-ray magnetic circular dichroism and first-principles calculation Peer-reviewed

    Shun Kanai, Masahito Tsujikawa, Yoshio Miura, Masafumi Shirai, Fumihiro Matsukura, Hideo Ohno

    APPLIED PHYSICS LETTERS　105　(22)　2014/12

    DOI： 10.1063/1.4903296 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  48. Magnetic properties of Ni2N Peer-reviewed

    H. Nishihara, K.Suzuki, R.Y.Umetsu, T.Kanomata, T.Kaneko, M.Y.Zhou, M. Tsujikawa, M.Shirai, T.Sakon, T.Wada, K.Terashima, S.Imada

    Physica B　449　85-89　2014/05

    DOI： 10.1016/j.physb.2014.05.016 　

  49. Detection of spin-resolved electronic structures from a buried ferromagnetic layer utilizing forward Mott scattering Peer-reviewed

    S. Ueda, M. Mizuguchi, T. Kojima, S. Ishimaru, M. Tsujikawa, M. Shirai, K. Takanashi

    Applied Physics Letters　2014/04

    DOI： 10.1063/1.4868248 　

  50. A first-principles study on magnetocrystalline anisotropy at interfaces of Fe with non-magnetic metals Peer-reviewed

    Yoshio Miura, Masahito Tsujikawa, Masafumi Shirai

    JOURNAL OF APPLIED PHYSICS　113　(23)　2013/06

    DOI： 10.1063/1.4811685 　

    ISSN： 0021-8979

  51. The origin of perpendicular magneto-crystalline anisotropy in L1(0)-FeNi under tetragonal distortion Peer-reviewed

    Yoshio Miura, Sho Ozaki, Yasushi Kuwahara, Masahito Tsujikawa, Kazutaka Abe, Masafumi Shirai

    JOURNAL OF PHYSICS-CONDENSED MATTER　25　(10)　2013/03

    DOI： 10.1088/0953-8984/25/10/106005 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  52. Interface atomic structures and magnetic anisotropy of Fe and Pd/Fe monatomic films on Pd(001) Peer-reviewed

    Tetsuro Ueno, Masahiro Sawada, Kazuhito Furumoto, Tetsuro Tagashira, Satoshi Tohoda, Akio Kimura, Shinya Haraguchi, Masahito Tsujikawa, Tatsuki Oda, Hirofumi Namatame, Masaki Taniguchi

    PHYSICAL REVIEW B　85　(22)　2012/06

    DOI： 10.1103/PhysRevB.85.224406 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  53. Effect of atomic monolayer insertions on electric-field-induced rotation of magnetic easy axis Peer-reviewed

    M. Tsujikawa, S. Haraguchi, T. Oda

    JOURNAL OF APPLIED PHYSICS　111　(8)　2012/04

    DOI： 10.1063/1.3703682 　

    ISSN： 0021-8979

  54. A comparative ab initio study on electric-field dependence of magnetic anisotropy in MgO/Fe/Pt and MgO/Fe/Au films Peer-reviewed

    M. Tsujikawa, S. Haraguchi, T. Oda, Y. Miura, M. Shirai

    JOURNAL OF APPLIED PHYSICS　109　(7)　2011/04

    DOI： 10.1063/1.3540677 　

    ISSN： 0021-8979

  55. Electric-field effects on magnetic anisotropy in Pd/Fe/Pd(001) surface Peer-reviewed

    Shinya Haraguchi, Masahito Tsujikawa, Junpei Gotou, Tatsuki Oda

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　44　(6)　2011/02

    DOI： 10.1088/0022-3727/44/6/064005 　

    ISSN： 0022-3727

  56. Spin-splitting band dispersions of the heavy elements on Si(111)-(1×1) surface

    Araki Atsushi, Nishijima T., Tsujikawa Masahito, Oda T.

    Journal of Physics: Conference Series　200　(6)　62001-62001　2010/01/01

    Publisher: Institute of Physics

    DOI： 10.1088/1742-6596/200/6/062001 　

    ISSN： 1742-6588

  57. Electronic Structure and Magnetic Anisotropy in Iron Chains from a First-Principles Study Peer-reviewed

    Masahito Tsujikawa, Tatsuki Oda

    JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE　6　(12)　2597-2602　2009/12

    DOI： 10.1166/jctn.2009.1320 　

    ISSN： 1546-1955

    eISSN： 1546-1963

  58. Magnetic Anisotropy in Small Clusters FePt, Fe2Pt, and FePt2: From a First-Principles Study Peer-reviewed

    Tatsuki Oda, Yasuhiro Yokoo, Hirofumi Sakashita, Masahito Tsujikawa

    JOURNAL OF COMPUTATIONAL AND THEORETICAL NANOSCIENCE　6　(12)　2603-2607　2009/12

    DOI： 10.1166/jctn.2009.1321 　

    ISSN： 1546-1955

    eISSN： 1546-1963

  59. Finite Electric Field Effects in the Large Perpendicular Magnetic Anisotropy Surface Pt/Fe/Pt(001): A First-Principles Study Peer-reviewed

    Masahito Tsujikawa, Tatsuki Oda

    PHYSICAL REVIEW LETTERS　102　(24)　2009/06

    DOI： 10.1103/PhysRevLett.102.247203 　

    ISSN： 0031-9007

  60. Abrupt Rotation of the Rashba Spin to the Direction Perpendicular to the Surface Peer-reviewed

    Kazuyuki Sakamoto, Tatsuki Oda, Akio Kimura, Koji Miyamoto, Masahito Tsujikawa, Ayako Imai, Nobuo Ueno, Hirofumi Namatame, Masaki Taniguchi, P. E. J. Eriksson, R. I. G. Uhrberg

    PHYSICAL REVIEW LETTERS　102　(9)　2009/03

    DOI： 10.1103/PhysRevLett.102.096805 　

    ISSN： 0031-9007

    eISSN： 1079-7114

  61. Magnetic anisotropy of Fe/Pt(001) and Pt/Fe/Pt(001) using a first-principles approach Peer-reviewed

    Masahito Tsujikawa, Akihiko Hosokawa, Tatsuki Oda

    PHYSICAL REVIEW B　77　(5)　2008/02

    DOI： 10.1103/PhysRevB.77.054413 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  62. Erratum: Magnetic anisotropies of iron on the Pt(111) surface (Journal of Physics Condensed Matter (2007) 19 (365208)) Peer-reviewed

    M. Tsujikawa, A. Hosokawa, T. Oda

    Journal of Physics Condensed Matter　19　(47)　2007/11/28

    DOI： 10.1088/0953-8984/19/47/479002 　

    ISSN： 0953-8984 1361-648X

  63. Magnetic anisotropies of iron on the Pt(111) surface Peer-reviewed

    M. Tsujikawa, A. Hosokawa, T. Oda

    JOURNAL OF PHYSICS-CONDENSED MATTER　19　(36)　2007/09

    DOI： 10.1088/0953-8984/19/36/365208 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  64. Magnetic anisotropies of iron on the low index platinum surface Peer-reviewed

    M. Tsujikawa, A. Hosokawa, T. Oda

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　2189-2191　2007/03

    DOI： 10.1016/j.jmmm.2006.10.754 　

    ISSN： 0304-8853

    eISSN： 1873-4766

Show all ︎Show first 5

Misc. 43

  1. 電界効果で界面の磁性を制御する Invited Peer-reviewed

    三輪真嗣, 鈴木基寛, 辻川雅人, 野崎隆行

    日本物理学会誌　74　(10)　714-719　2019/10

  2. X線磁気円二色性分光を用いた金属磁性体の電界効果素子研究 Invited

    三輪真嗣, 鈴木基寛, 辻川雅人, 野崎隆行

    まぐね　14　(3)　146-152　2019/06

  3. D019型X3Sn(X=Fe,Mn)薄膜の作製とその磁気伝導特性

    前野央, 柳瀬隆, 島田敏宏, 辻川雅人, 辻川雅人, 白井正文, 白井正文, 長浜太郎

    応用物理学会春季学術講演会講演予稿集(CD-ROM)　66th　2019

  4. 第三元素を添加したFe/Ni薄膜の規則化現象

    田代敬之, 水口将輝, 小金澤智之, 鈴木英伸, 三浦良雄, 辻川雅人, 白井正文, 高梨弘毅

    日本磁気学会学術講演概要集　40th　2016

    ISSN： 1882-2959

  5. Co/Niエピタキシャル人工格子における磁気異方性とダンピング

    関剛斎, 島田淳平, 飯浜賢志, 辻川雅人, 小金澤智之, 塩田明弘, 田代敬之, ZHOU W., 菊池直登, 水上成美, 白井正文, 高梨弘毅

    日本磁気学会学術講演概要集　40th　2016

    ISSN： 1882-2959

  6. Ti添加によるL10-FeNi規則合金薄膜の作製と評価

    田代敬之, 水口将輝, 小金澤智之, 三浦良雄, 辻川雅人, 白井正文, 鈴木英伸, 高梨弘毅

    日本金属学会講演概要(CD-ROM)　158th　2016

    ISSN： 2433-3093

  7. 原子層積層制御したCo/Niエピタキシャル人工格子における磁気特性

    関剛斎, 島田淳平, 飯浜賢志, 辻川雅人, 小金澤智之, 田代敬之, 周偉男, 菊池直登, 水上成美, 白井正文, 高梨弘毅

    日本金属学会講演概要(CD-ROM)　159th　2016

    ISSN： 2433-3093

  8. [Fe-X/Ni](X=Ti,V)多層膜のL10規則化

    田代敬之, 水口将輝, 小金澤智之, 鈴木英伸, 三浦良雄, 辻川雅人, 白井正文, 高梨弘毅

    日本金属学会講演概要(CD-ROM)　159th　2016

    ISSN： 2433-3093

  9. 7pPSA-92 Theoretical design of Co-based Heusler alloys undergoing magnetostructural phase transformation

    Kano S., Tsujikawa M., Abe K., Shirai M.

    Meeting abstracts of the Physical Society of Japan　69　(2)　283-283　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  10. 27aPS-20 Role of lattice distortion in the electric field control of magnetism at the MgO/FeCo interface

    Tsujikawa Masahito, Shirai Masafumi

    Meeting abstracts of the Physical Society of Japan　69　(1)　479-479　2014/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  11. Magnetic anisotropy of Co-based Heusler alloy and MgO interface: a first principles study

    Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

    Meeting abstracts of the Physical Society of Japan　68　(2)　364-364　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  12. A first-principles study on substitution effects on magnetocrystalline anisotropy of L1_0-FeNi

    Miura Y., Ozaki S., Tsujikawa M., Shirai M.

    Meeting abstracts of the Physical Society of Japan　68　(2)　382-382　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  13. New Approach to Spin-Resolved Phetoemission using Hard X-rays

    Ueda S., Mizuguchi M., Kojima T., Ishimaru S., Tsujikawa M., Shirai M., Takanashi K., Sakata O.

    Meeting abstracts of the Physical Society of Japan　68　(2)　700-700　2013/08/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  14. 29aXW-11 Electric field effects on perpendicular magnetic anisotropy of MgO/CoFeAl interface

    Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

    Meeting abstracts of the Physical Society of Japan　68　(1)　562-562　2013/03/26

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  15. 19aCC-11 Interface magnetic anisotropy of Fe/metal nitride (carbide) film

    Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi

    Meeting abstracts of the Physical Society of Japan　67　(2)　413-413　2012/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  16. 27pCK-2 Electric field effects on magnetic anisotropies in FePd thin film

    Haraguchi S., Tsujikawa M., Gotou J., Oda T.

    Meeting abstracts of the Physical Society of Japan　67　(1)　978-978　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  17. 27pCK-2 Electric field effects on magnetic anisotropies in FePd thin film

    Haraguchi S., Tsujikawa M., Gotou J., Oda T.

    Meeting abstracts of the Physical Society of Japan　67　(1)　540-540　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  18. 24aPS-30 First principle calculation of magnetic anisotropy and electric field effect of Pd/Fe/Pd/Fe/Pd(001)

    Taguchi Y., Haraguchi S., Tsujikawa M., Gotou J., Oda T.

    Meeting abstracts of the Physical Society of Japan　67　(1)　482-482　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  19. 24aPS-32 Theoretical study on magnetic anisotropy of Fe/GaAs interface

    Miura Y., Tsujikawa M., Shirai M.

    Meeting abstracts of the Physical Society of Japan　67　(1)　482-482　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  20. 24aBG-2 Magnetic anisotropy of Fe/CoMgO interfaces and its electric field effect.

    Tsujikawa M., Miura Y., Shirai M.

    Meeting abstracts of the Physical Society of Japan　67　(1)　470-470　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  21. 23pPSB-8 Development of high performance computation in the planewave pseudopotential first principles code and application to slab system

    Gotou J., Haraguchi S., T. Masahito, Oda T.

    Meeting abstracts of the Physical Society of Japan　66　(2)　947-947　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  22. 23pJB-10 Electric field effects on magnetic anisotropies of Pd/Fe/Pd(001)

    Haraguchi S., Tsujikawa M., Gotou J., Oda T.

    Meeting abstracts of the Physical Society of Japan　66　(2)　936-936　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  23. 23pJB-9 Nonlinear modulation of electric field effects on magnetic anisotropy in the Fe/Au(001) surface

    Tsujikawa M, Miura Y, Shirai M, Oda T

    Meeting abstracts of the Physical Society of Japan　66　(2)　2011/08/24

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  24. 25aPS-27 Electric field effects on magnetic anisotropies of FeCo-alloy thin film

    Haraguchi S., Gotou J., Tsujikawa M., Oda T.

    Meeting abstracts of the Physical Society of Japan　65　(2)　404-404　2010/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  25. 22pGL-3 Electric field effects on magnetic anisotropy of the perpendicular magnetized film covered with the dielectric material : from a first principles approach

    Tsujikawa Masahito, Miura Yoshio, Shirai Masafumi, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　65　(1)　953-953　2010/03/01

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  26. 25pRA-9 Electric-field effects of magnetic anisotropy in a perpendicularly magnetized film covered by MgO

    Tsujikawa M, Miura Y, Shirai M, Oda T

    Meeting abstracts of the Physical Society of Japan　64　(2)　803-803　2009/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  27. 30aTF-7 Electric field effect for magnetic anisotropies of FePt thin films on Pt(001) surface

    Tsujikawa Masahito, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　64　(1)　923-923　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  28. 30aTF-7 Electric field effect for magnetic anisotropies of FePt thin films on Pt(001) surface

    Tsujikawa Masahito, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　64　(1)　514-514　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  29. Tl/Si(111)‐1×1表面電子構造とC3対称性スピン分裂

    小田竜樹, 辻川雅人, 木村昭夫, 坂本一之

    日本物理学会講演概要集　64　(1)　925-925　2009/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  30. Electronic structure and magnetic anisotropy of a constrained Fe chain in an electric field

    M. Tsujikawa, T. Oda

    JOURNAL OF PHYSICS-CONDENSED MATTER　21　(6)　2009/02

    DOI： 10.1088/0953-8984/21/6/064213 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  31. Surface Magnetic Anisotropy Calculation by the First-principles Approach

    ODA Tatsuki, TSUJIKAWA Masahito

    Journal of the Surface Science Society of Japan　29　(10)　637-641　2008/10/10

    Publisher: 日本表面科学会

    ISSN： 0388-5321

  32. 22pPSB-30 First-principles calculations for atomic structure and magnetic anisotropy of FePt clusters

    Yokoo Y., Sakashita H., Tsujikawa M., Hosokawa A., Oda T.

    Meeting abstracts of the Physical Society of Japan　63　(2)　844-844　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  33. 20aXA-9 Electronic structures and magnetic anisotropies of iron chains on platinum vicinal surface

    Tsujikawa Masahito, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　63　(2)　796-796　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  34. 20aXA-9 Electronic structures and magnetic anisotropies of iron chains on platinum vicinal surface

    Tsujikawa Masahito, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　63　(2)　362-362　2008/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  35. 24pWK-14 Electronic structures and magnetic anisotropies of iron chains on platinum surfaces

    Tsujikawa Masahito, Hosokawa Akihiko, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　63　(1)　484-484　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  36. 24pWK-14 Electronic structures and magnetic anisotropies of iron chains on platinum surfaces

    Tsujikawa Masahito, Hosokawa Akihiko, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　63　(1)　877-877　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  37. 24pPSA-43 Atomic structure and magnetic anisotropy of FePt clusters

    Yokoo Y., Sakashita H., Tsujikawa M., Hosokawa A., Oda T.

    Meeting abstracts of the Physical Society of Japan　63　(1)　889-889　2008/02/29

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  38. Magnetic anisotropies of iron on the Pt(111) surface

    M. Tsujikawa, A. Hosokawa, T. Oda

    JOURNAL OF PHYSICS-CONDENSED MATTER　19　(47)　2007/11

    DOI： 10.1088/0953-8984/19/41/419002 　

    ISSN： 0953-8984

  39. 22pPSA-11 Development of fully relativistic pseudopotentials and application to surfaces

    Hosokawa Akihiko, Tsujikawa Masahito, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　62　(2)　934-934　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  40. 21aWD-5 Magnetic anisotropies of iron thin films on platinum surface

    Tsujikawa Masahito, Hosokawa Akihiko, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　62　(2)　431-431　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  41. 21aWD-5 Magnetic anisotropies of iron thin films on platinum surface

    Tsujikawa Masahito, Hosokawa Akihiko, Oda Tatsuki

    Meeting abstracts of the Physical Society of Japan　62　(2)　905-905　2007/08/21

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  42. Development of fully relativistic pseudopotentials and application to a thin magnetic film on the metal

    Hosokawa A., Tsujikawa M., Shiroishi H., Oda Tatsuki

    Journal of Magnetism and Magnetic Materials　310　(2)　1637-1639　2007/03/01

    Publisher: Elsevier

    ISSN： 0304-8853

  43. 19aZC-2 Structure of thin film on Pt(111) surface and magnetic anisotropy energy

    Oda T., Tsujikawa M., Hosokawa A.

    Meeting abstracts of the Physical Society of Japan　62　(1)　452-452　2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

Show all ︎Show first 5

Presentations 9

  1. Giant modulation of magnetization induced by electric polarization reversal at Fe4N/BaTiO3 interface International-presentation

    So Kumata, Masahito Tsujikawa, Masafumi Shirai

    62nd Annual Conference on Magnetism and Magnetic Materials　2017/11/06

  2. Huge electric-field-induced magnetic anisotropy of the 5d transition-metal monolayers on Fe(001) and Co(0001) International-presentation

    Masahito Tsujikawa, Masafumi Shirai

    28th Magnetic Recording Conference　2017/08/02

  3. Huge voltage-induced magnetic anisotropy change of 5d transition-metals on Fe(001) and Co(0001) International-presentation

    Masahito Tsujikawa, Masafumi Shirai

    IEEE International Magnetics Conference 2017　2017/04/24

  4. Enhancement of magnetization in Mn-Ga alloys doped with typical elements International-presentation

    Masahito Tsujikawa, Masafumi Shirai

    IEEE International Magnetics Conference 2017　2017/04/24

  5. First-Principles Study on the Magnetostructural Phase Transitions of Co-based Heusler Alloys International-presentation

    The Fifth International Conference on Ferromagnetic Shape Memory Alloys　2016/09/05

  6. First-principles calculation of electronic structure in NiMnSb/MgO and CoMnSb/MgO junctions International-presentation

    The 4th International Conference of Asian Union of Magnetics Societies　2016/08/01

  7. First-principles study on the magnetic anisotropy and magnetic damping in hexagonal Fe/Co, Co/Ni, Fe/Ni multilayers International-presentation

    The 9th International Symposium on Metallic Multilayers　2016/06/19

  8. First-principles study on the electronic and magnetic properties of BiFeO3 and Bi(Fe,Co)O3 International-presentation

    Japan & France Joint workshop　2016/05/02

  9. 典型元素を添加したMn-Ga合金の磁気特性に関する第一原理計算

    日本物理学会第72回年次大会　2016/03/17

Show all Show first 5

Industrial Property Rights 1

  1. L10型FeNi規則合金の製造方法

    水口 将輝, 田代 敬之, 高梨 弘毅, 三浦 良雄, 辻川 雅人, 白井 正文

    Property Type: Patent

Research Projects 5

  1. Hysteresis control for the new phase of Co-based reentrant shape memory alloys

    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

    2022/04/01 - 2025/03/31

  2. Hysteresis control for the new phase of Co-based reentrant shape memory alloys

    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

    2022/04/01 - 2025/03/31

  3. Development of novel Co-based reentrant shape memory alloys showing anomalous martensitic transformation

    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

    2019/04/01 - 2023/03/31

  4. 軽元素添加による高磁化磁性材料の創製ならびに革新的永久磁石材料の開発 Competitive

    System: Funded Research

    2016/04 - 2017/03

  5. ナノ磁性表面の磁気構造・磁気異方性の電場および磁場による制御に向けて

    辻川 雅人

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 特別研究員奨励費

    Institution: 金沢大学

    2008 - 2010

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    本年度は、磁気異方性の外場制御の確立へ向けて、電界による非線形な磁気異方性変化の起源の解明、および現実的な電界で磁化反転可能な磁性薄膜デザインを行った。 Fe/Au(001)及びFe/Pt(001)表面は私の研究により磁気異方性エネルギー(MAE)が電界に対して非線形に変化することが明らかとなった。非線形な効果は、一部薄膜材料や表面において実験的にも観測されている。バンド構造の電界効果から、鉄のd軌道成分がフェルミ準位をまたぐときに非線形な効果が現れることが明らかとなった。また、Fe/Pt薄膜ではFe/Au薄膜に比べ10倍程度大きなMAEの変化が見られ、電界に対するMAE変化の傾きが大きなところで137fJ/Vmと得られた。これは、これまでの理論計算から得られている値のうち最大のものである。 次に、重原子層が電界効果へ与える影響を明らかとすること及び実現可能な電界で磁化反転可能な薄膜のデザインを目的に、MgO/Fe/重原子層M(001)およびMgO/重原子層M/Fe/Au(001)薄膜(M=Pd,Pt,Au)について全MAE(電子系からの寄与と形状磁気異方性からの寄与を合わせたもの)及びその電界依存を調べた。重原子層の原子種により電界効果が異なっており、1層程度の重原子層よる効果の制御の可能性が示された。特に、Pt層に関しては1層挿入するだけで、電界によるMAE変化を増幅することがわかった。また、Fe層を3層にしたMgO/Pt/Fe(3ML)/Au(001)薄膜についても計算を行い、Fe層の層数を制御することで、大きな電界効果を保ちつつ全MAEの値を調整できることが確かめられた。