研究者詳細

顔写真

テヅカ ノブキ
手束 展規
Nobuki Tezuka
所属
大学院工学研究科 知能デバイス材料学専攻 情報デバイス材料学講座(先端マグネト材料学分野)
職名
教授
学位
  • 工学博士 (東北大学)

委員歴 6

  • 日本磁気学会 現地実行委員

    2007年10月 ~ 2008年9月

  • 日本磁気学会 現地実行委員

    2007年10月 ~ 2008年9月

  • 19th International Colloquium on Magnetic Films and Surfaces現地実行委員 現地実行委員

    2006年8月 ~

  • 19th International Colloquium on Magnetic Films and Surfaces現地実行委員 現地実行委員

    2006年8月 ~

  • 第65 回応用物理学会学術講演会現地実行委員 現地実行委員

    2004年9月 ~

  • 第65 回応用物理学会学術講演会現地実行委員 現地実行委員

    2004年9月 ~

︎全件表示 ︎最初の5件までを表示

所属学協会 4

  • 日本応用物理学会

  • 日本金属学会

  • 日本物理学会

  • 日本応用磁気学会

研究分野 3

  • ナノテク・材料 / 結晶工学 /

  • ナノテク・材料 / 応用物性 /

  • ナノテク・材料 / 構造材料、機能材料 /

論文 269

  1. Spin–orbit torque magnetization switching in CoFeB/Ta/CoFeB tri-layer thin films 査読有り

    Koki Okada, Yoshiaki Saito, Nobuki Tezuka

    AIP Advances 16 (2) 2026年2月1日

    出版者・発行元: AIP Publishing

    DOI: 10.1063/9.0001011  

    eISSN:2158-3226

    詳細を見る 詳細を閉じる

    Spin–orbit torque magnetoresistive random-access memory (SOT-MRAM) with a perpendicularly magnetized ferromagnet (PMF) is a promising candidate for future low-power and high-performance non-volatile memory. However, conventional SOT devices require an external in-plane magnetic field to achieve deterministic magnetization switching, which is a major obstacle for high-density integration. To overcome this issue, we investigate field-free SOT switching in a CoFeB(PMF)/Ta/CoFeB(IMF) trilayer structure, where a Ta layer separates the PMF and an in-plane magnetized ferromagnet (IMF). We successfully demonstrate deterministic field-free magnetization switching in this trilayer system. The switching current density (Jc) was systematically investigated as a function of the Ta and CoFeB(IMF) layer thicknesses, revealing an optimal structure with a significantly reduced. At the optimal thickness of tTa = 5.0 nm and tIMF = 2.0 nm, the switching current density was minimized. To elucidate the origin of this high efficiency, we performed anomalous Hall effect measurements. A large current-induced loop shift was observed, corresponding to a giant effective magnetic field that assists the magnetization reversal. The efficiency of this current-induced field was found to be enhanced by a factor of 4.5 in the trilayer structure compared to a bilayer control sample. We attribute this giant assistance effect to the IMF layer, which enables both the symmetry breaking required for field-free switching and a dramatic reduction in the switching current. These findings provide a new and effective pathway for developing practical, field-free, and low-power SOT-MRAM devices.

  2. Microwave Absorption Properties of Fe<sub>3</sub>B–Fe Composite Powder 査読有り

    Masashi Matsuura, Shuhei Miyazaki, Gaku Ishida, Saijian Ajia, Mitsuharu Sato, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 66 (12) 1599-1604 2025年12月1日

    出版者・発行元: Japan Institute of Metals

    DOI: 10.2320/matertrans.mt-m2025079  

    ISSN:1345-9678

    eISSN:1347-5320

  3. Room temperature ferromagnetism in polymorphic (Cr,Mn)Te films 査読有り

    Mihyeon Kim, Ryoga Nakajima, Takashi Harumoto, Yi Shuang, Daisuke Ando, Nobuki Tezuka, Yuta Saito, Yuji Sutou

    APL MATERIALS 13 (6) 2025年6月

    DOI: 10.1063/5.0266675  

    ISSN:2166-532X

  4. Field-free spin-orbit torque switching and large dampinglike spin-orbit torque efficiency in synthetic antiferromagnetic systems using interfacial Dzyaloshinskii-Moriya interaction 査読有り

    Yoshiaki Saito, Shoji Ikeda, Nobuki Tezuka, Hirofumi Inoue, Tetsuo Endoh

    Physical Review B 108 (2) 2023年7月20日

    出版者・発行元: American Physical Society (APS)

    DOI: 10.1103/physrevb.108.024419  

    ISSN:2469-9950

    eISSN:2469-9969

  5. Deterministic Current‐Induced Perpendicular Switching in Epitaxial Co/Pt Layers without an External Field 査読有り

    Jeongchun Ryu, Can Onur Avci, Moojune Song, Mantao Huang, Ryan Thompson, Jiseok Yang, San Ko, Shutaro Karube, Nobuki Tezuka, Makoto Kohda, Kab‐Jin Kim, Geoffrey S. D. Beach, Junsaku Nitta

    Advanced Functional Materials 2023年7月2日

    出版者・発行元: Wiley

    DOI: 10.1002/adfm.202209693  

    ISSN:1616-301X

    eISSN:1616-3028

  6. Magnetic Switching Properties for Synthetic Antiferromagntic Layers with Perpendicular Easy Magnetic Anisotropy 査読有り

    N. Tezuka, S. Fujikawa, H. Akatani, M. Matsuura, S. Sugimoto, Y. Saito

    2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) 2023年5月

    出版者・発行元: IEEE

    DOI: 10.1109/intermagshortpapers58606.2023.10228461  

  7. Low magnetic damping constant in half-metallic Co2FeAl Heusler alloy thin films grown by molecular beam epitaxy 査読有り

    Takayuki Hojo, Nobuki Tezuka, Takafumi Nakano, Masakiyo Tsunoda, Mikihiko Oogane

    AIP Advances 13 (2) 025204 2023年2月1日

    DOI: 10.1063/9.0000419  

  8. Enhancement of microwave absorption properties using spinodally decomposed Fe–Cr–Co flakes 査読有り

    564 (Part2) 170200-1-170200-11 2022年12月15日

    出版者・発行元:

    DOI: 10.1016/j.jmmm.2022.170200  

    ISSN:0304-8853

  9. Development of an alternative approach for electromagnetic wave absorbers using Fe–Cr–Co alloy powders 査読有り

    Saijian Ajia, Hirotaka Asa, Yuichiro Toyoda, Mitsuharu Sato, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    Journal of Alloys and Compounds 903 163920-163920 2022年5月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.jallcom.2022.163920  

    ISSN:0925-8388

  10. Permeability and Noise Suppression Property of Resin Composite with Fe Flake 査読有り

    Yuichiro Toyoda, Saijian Ajia, Mitsuharu Sato, Masashi Matsuura, Nobuki Tezuka, Yasushi Endo, Satoshi Sugimoto

    IEEJ Transactions on Fundamentals and Materials 142 (2) 45-51 2022年2月1日

    出版者・発行元: Institute of Electrical Engineers of Japan (IEE Japan)

    DOI: 10.1541/ieejfms.142.45  

    ISSN:0385-4205

    eISSN:1347-5533

  11. Electromagnetic Wave Absorption Properties of Resin Composites Containing α-Fe/Co0.5Fe2.5O4 Mixed Powders 査読有り

    Hirotaka ASA, Saijian AJIA, Mitsuharu SATO, Masashi MATSUURA, Nobuki TEZUKA, Satoshi SUGIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy 68 (9) 347-355 2021年9月15日

    出版者・発行元: Japan Society of Powder and Powder Metallurgy

    DOI: 10.2497/jjspm.68.347  

    ISSN:0532-8799

    eISSN:1880-9014

  12. Antiferromagnetic interlayer exchange coupling and large spin Hall effect in multilayer systems with Pt/Ir/Pt and Pt/Ir layers 査読有り

    Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Tetsuo Endoh

    Physical Review B 104 (6) 2021年8月23日

    出版者・発行元: American Physical Society (APS)

    DOI: 10.1103/physrevb.104.064439  

    ISSN:2469-9950

    eISSN:2469-9969

  13. Optical and Electrical Properties of InxGa1-xSe Mixed Crystal Grown from Indium Flux by Traveling Heater Method 査読有り

    Yohei Sato, Chao Tang, Katsuya Watanabe, Mayu Nakajima, Takuya Yamamoto, Nobuki Tezuka, Tadao Tanabe, Yutaka Oyama

    JOURNAL OF ELECTRONIC MATERIALS 50 (5) 2649-2655 2021年5月

    DOI: 10.1007/s11664-020-08689-4  

    ISSN:0361-5235

    eISSN:1543-186X

  14. W thickness dependence of spin Hall effect for (W/Hf)-multilayer electrode/CoFeB/MgO systems with flat and highly (100) oriented MgO layer 査読有り

    Y. Saito, N. Tezuka, S. Ikeda, T. Endoh

    AIP Advances 11 (2) 025007-1-025007-6 2021年2月

    DOI: 10.1063/9.0000011  

  15. Magnetic Properties and Microstructure of W, La Added Sm2Fe17N3 Powders

    Masashi MATSUURA, Shiho SUZUKI, Kuniko YAMAMOTO, Nobuki TEZUKA, Satoshi SUGIMOTO

    Journal of the Japan Society of Powder and Powder Metallurgy 67 (12) 682-687 2020年12月15日

    出版者・発行元: Japan Society of Powder and Powder Metallurgy

    DOI: 10.2497/jjspm.67.682  

    ISSN:0532-8799

    eISSN:1880-9014

  16. Preparation of Highly Heat–Resistant Sm–Fe–N Magnetic Powder by Reduction–Diffusion Process 査読有り

    Ruka Matsuda, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Takashi Ishikawa, Yukinobu Yoneyama

    MATERIALS TRANSACTIONS 61 (11) 2201-2207 2020年11月1日

    出版者・発行元: Japan Institute of Metals

    DOI: 10.2320/matertrans.mt-m2020185  

    ISSN:1345-9678

    eISSN:1347-5320

  17. Microstructural changes in high-coercivity Zn-bonded Sm-Fe-N magnets 査読有り

    Masashi Matsuura, Kuniko Yamamoto, Nobuki Tezuka, Satoshi Sugimoto

    Journal of Magnetism and Magnetic Materials 510 166943-166943 2020年9月

    出版者・発行元: Elsevier BV

    DOI: 10.1016/j.jmmm.2020.166943  

    ISSN:0304-8853

  18. Preparation of Sm−Fe−N Bulk Magnets with High Maximum Energy Products 査読有り

    R. Matsunami, M. Matsuura, N. Tezuka, S. Sugimoto

    Journal of the Magnetics Society of Japan 44 (3) 64-69 2020年5月1日

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/msjmag.2005r003  

    ISSN:1882-2924

    eISSN:1882-2932

  19. Large spin Hall effect and increase in perpendicular magnetic anisotropy in artificially synthesized amorphous W/Hf multilayer/CoFeB system 査読有り

    Saito, Y., Tezuka, N., Ikeda, S., Endoh, T.

    Applied Physics Letters 116 (13) 132401-1-132401-5 2020年3月

    DOI: 10.1063/5.0002642  

  20. Anomalous Spin-Orbit Field via the Rashba-Edelstein Effect at the W/Pt Interface 査読有り

    Shutaro Karube, Nobuki Tezuka, Makoto Kohda, Junsaku Nitta

    Physical Review Applied 13 (2) 2020年2月

    DOI: 10.1103/PhysRevApplied.13.024009  

    eISSN:2331-7019

  21. Terahertz wave generation via difference frequency generation using 2D In<inf>x</inf>Ga<inf>1−x</inf>Se crystal grown from indium flux 査読有り

    Yohei Sato, Chao Tang, Katsuya Watanabe, Junya Ohsaki, Takuya Yamamoto, Nobuki Tezuka, Tadao Tanabe, Yutaka Oyama

    Optics Express 28 (1) 472-477 2020年

    DOI: 10.1364/OE.28.000472  

    eISSN:1094-4087

  22. Spin Hall effect investigated by spin Hall magnetoresistance in Pt100−xAux/CoFeB systems 査読有り

    Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Tetsuo Endoh

    AIP Advances 9 125312-1-125312-5 2019年12月

    DOI: 10.1063/1.5129889  

  23. 高特性Sm-Fe-N系バルク磁石の組織と磁気特性

    松浦 昌志, 松南 諒, 西島 佑樹, 手束 展規, 杉本 諭

    電気学会マグネティックス研究会資料 (MAG-18-197~208) 61-64 2019年12月

  24. Fabrication of Co2Fe(Al,Si) and Co2Fe(Al,Si)/MgO on Ge(111) Substrate and Its Magnetic Properties 国際誌 査読有り

    Kohei Kataoka, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    17 (2) 109-115 2019年11月11日

    DOI: 10.11989/JEST.1674-862X.71128011  

  25. Fabrication of Anisotropic Nd-Fe-B Powders by Ta Sputtering 査読有り

    Moe Kimura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    Materials Transactions 60 (5) 830-836 2019年4月

    DOI: 10.2320/matertrans.M2019003  

  26. Cr拡散Sm2Fe17Nxコア・シェル磁石粉末の作製 査読有り

    松田 瑠香, 鑓水 啓介, 松浦 昌志, 手束 展規, 杉本 諭, 石川 尚, 米山 幸伸

    粉体および粉末冶金 66 (3) 116-121 2019年3月

    DOI: 10.2497/jjspm.66.116  

  27. Preparation of Mn-diffused Sm-Fe-N core-shell powder by reduction-diffusion process. 査読有り

    Masashi Matsuura, Keisuke Yarimizu, Yohei Osawa, Nobuki Tezuka, Satoshi Sugimoto, Takashi Ishikawa, Yukinobu Yoneyama

    Journal of Magnetism and Magnetic Materials 471 310-314 2019年2月

    DOI: 10.1016/j.jmmm.2018.09.084  

  28. Increase in spin-Hall effect and influence of anomalous Nernst effect on spin-Hall magnetoresistance in β-phase and α-phase W <inf>100-x</inf> Ta <inf>x</inf> /CoFeB systems 査読有り

    Yoshiaki Saito, Nobuki Tezuka, Shoji Ikeda, Hideo Sato, Tetsuo Endoh

    Applied Physics Express 12 2019年1月1日

    DOI: 10.7567/1882-0786/ab1a66  

    ISSN:1882-0778

  29. 低酸素化によるSm-Fe-N系バルク磁石の高特性化

    松浦 昌志, 西島 佑樹, 手束展規, 杉本 諭

    電気学会マグネティックス研究会資料 MAG-18-184~192 41-45 2018年12月

  30. Increase of energy products of Zn-bonded Sm-Fe-N magnets with low oxygen content. 査読有り

    Journal of Magnetism and Magnetic Materials 467 64-68 2018年12月

    出版者・発行元:

    DOI: 10.1016/j.jmmm.2018.07.064  

    ISSN:0304-8853

  31. ε-Fe2O3微粒子の水素還元による相変化と磁気特性

    阿部 格, 片桐 直人, 松浦 昌志, 手束 展規, 杉本 諭

    電気学会研究会資料 マグネティックス研究会 MAG-18-081~097 71-76 2018年8月

  32. Voltage control of a magnetic switching field for magnetic tunnel junctions with low resistance and perpendicular magnetic anisotropy 査読有り

    N. Tezuka, S. Oikawa, M. Matsuura, S. Sugimoto, K. Nishimura, T. Irisawa, Y. Nagamine, K. Tsunekawa

    AIP Advances 8 (5) 55922-1-55922-5 2018年5月1日

    出版者・発行元: American Institute of Physics Inc.

    DOI: 10.1063/1.5006398  

    ISSN:2158-3226

    eISSN:2158-3226

  33. High coercive Zn-bonded Sm-Fe-N magnets prepared using fine Zn particles with low oxygen content 査読有り

    Masashi Matsuura, Tomoki Shiraiwa, Nobuki Tezuka, Satoshi Sugimoto, Tetsuya Shoji, Noritsugu Sakuma, Kazuaki Haga

    Journal of Magnetism and Magnetic Materials 452 243-248 2018年4月15日

    出版者・発行元: Elsevier B.V.

    DOI: 10.1016/j.jmmm.2017.12.059  

    ISSN:0304-8853

  34. Interfacial crystal structures and non-local spin signals of Co2FeAl0.5Si0.5/n-GaAs junctions 査読有り

    Kohei Kataoka, Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    IEEE Transactions on Magnetics 54 (1) 4400103-1-4400103-3 2018年1月1日

    出版者・発行元: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/TMAG.2017.2756986  

    ISSN:0018-9464

  35. Nd-CuスパッタリングによるNd-Fe-B系超微細粉末の高保磁力化

    飯島亜美, 松浦昌志, 手束展規, 杉本諭, 東, 宇根康裕, 久保博一, 溝口徹彦, 入山恭彦, 佐川眞人, インターメタリックス

    電気学会マグネティックス研究会資料 (MAG-17-186~103 ) 83-88 2017年8月8日

  36. α-Fe/FePd複合粉末の作製と磁気特性

    阿部 格, 小川 智之, 松浦 昌志, 手束 展規, 齊藤 伸, 杉本 諭

    電気学会マグネティックス研究会資料 (MAG-17-186~103 ) 69-74 2017年8月8日

  37. Crystal, electronic structures and spin signals Co2FeAl0.5Si0.5/n-GaAs junctions. 査読有り

    N. Tezuka, K. Kataoka, T. Saito, M. Matsuura, S. Sugimoto

    2017 IEEE International Magnetics Conference (INTERMAG) 2017年8月

    DOI: 10.1109/INTMAG.2017.8007723  

  38. アークプラズマ蒸着法による複合磁性ナノ粒子の作製 査読有り

    松浦 昌志, 五十嵐 拓也, 山本 鉄郎, 手束 展規, 杉本 諭

    粉体および粉末冶金 64 (7) 364-371 2017年7月15日

    DOI: 10.2497/jjspm.64.364  

  39. Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination 査読有り

    Masao Yamazaki, Takashi Horikawa, Chisato Mishima, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    AIP ADVANCES 7 (5) 056220 2017年5月

    DOI: 10.1063/1.4975697  

    ISSN:2158-3226

  40. Magnetoresistance ratio through Si semiconductor using a magnetic tunnel junction 査読有り

    N. Tezuka, S. Oikawa, M. Matsuura, S. Sugimoto, Y. Saito

    IEEE International magnetic conference 2017 (Intermag 2017) CN-13 2017年4月

  41. Room temperature observation of high spin polarization in post annealed Co2FeSi/MgO/n+-Si 査読有り

    A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka, Y. Saito

    Jpn. J. Appl. Phys. 56 04CD05-1-04CD05-5 2017年2月24日

    DOI: 10.7567/JJAP.56.04CD05  

  42. Effect of hydrogenation disproportionation conditions on magnetic anisotropy in Nd-Fe-B powder prepared by dynamic hydrogenation disproportionation desorption recombination. 査読有り

    手束 展規

    AIP Advances 7 (5) 056220-1-056220-8 2017年2月

  43. Study of an Al-Ca Alloy with Low Young's Modulus 査読有り

    Jun Yu, Yasuo Ishiwata, Yoshihiro Taguchi, Daisuke Shimosaka, Ryosuke Taniguchi, Takutoshi Kondo, Nobuki Tezuka

    LIGHT METALS 2017 167-171 2017年

    DOI: 10.1007/978-3-319-51541-0_23  

    ISSN:2367-1181

  44. Improvement of Coercivity of Nd-Fe-B Powder by Nd-Cu Sputtering 査読有り

    Ami Iijima, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

    MATERIALS TRANSACTIONS 58 (5) 825-828 2017年

    DOI: 10.2320/matertrans.M2016448  

    ISSN:1345-9678

    eISSN:1347-5320

  45. Room temperature observation of large spin accumulation and transport signals in post annealed Co2FeSi/MgO/n+-Si on insulator devices 査読有り

    A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka, Y. Saito

    2016 International conference on solid state devices and materials (SSDM 2016) 2016年9月

  46. Effect of post annealing on spin accumulation and transport signals in Co2FeSi/MgO/n(+)-Si on insulator devices 査読有り

    Ajay Tiwari, Tomoaki Inokuchi, Mizue Ishikawa, Hideyuki Sugiyama, Nobuki Tezuka, Yoshiaki Saito

    AIP ADVANCES 6 (7) 075119 2016年7月

    DOI: 10.1063/1.4960210  

    ISSN:2158-3226

  47. High-Coercivity Fe-Co Nanoparticles Prepared by Pulsed Arc Plasma Deposition 査読有り

    Daiki Horiyama, Masashi Matsuura, Tetsuro Yamamoto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 57 (2) 207-211 2016年2月

    DOI: 10.2320/matertrans.MAW201510  

    ISSN:1345-9678

    eISSN:1347-5320

  48. Spin accumulation signals in CoFe/MgO/n+-Si devices deposited on Si (1×1) and Si (2×1) surfaces 査読有り

    Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Kohei Hamaya, Nobuki Tezuka

    Joint MMM/Intermag Conference, 2016 2016年1月

  49. Spin Injection, Transport, and Detection in a Lateral Spin Transport Devices with Co2FeAl0.5Si0.5/n-GaAs, Co2FeSi/MgO/n-Si, and CoFe/MgO/n-Si Junctions 査読有り

    Nobuki Tezuka, Yoshiaki Saito

    MATERIALS TRANSACTIONS 57 (6) 767-772 2016年

    DOI: 10.2320/matertrans.ME201502  

    ISSN:1345-9678

    eISSN:1347-5320

  50. Perpendicular Magnetic Tunnel Junctions With Low Resistance-Area Product: High Output Voltage and Bias Dependence of Magnetoresistance 査読有り

    N. Tezuka, S. Oikawa, I. Abe, M. Matsuura, S. Sugimoto, K. Nishimura, T. Seino

    IEEE MAGNETICS LETTERS 7 3104104-3104204 2016年

    DOI: 10.1109/LMAG.2016.2584582  

    ISSN:1949-307X

  51. FeCo-Ti-N系異方性薄膜における結晶構造と磁気特性の膜厚依存性

    河原 崇範, 松浦 昌志, 手束 展規, 杉本 諭

    電気学会 マグネティックス研究会資料,MAG-15-160 33-37 2015年12月1日

  52. Influence of Swaging on the Magnetic Properties of Zn-Bonded Sm-Fe-N Magnets 査読有り

    Kohei Kataoka, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 56 (10) 88-92 2015年10月

    DOI: 10.2320/matertrans.M2015190  

    ISSN:1345-9678

    eISSN:1347-5320

  53. Influence of Si surface on spin accumulation and transport signals in CoFe/MgO/n+-Si junctions 査読有り

    Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Nobuki Tezuka, Kohei Hamaya, Yoshiaki Saito

    2015 International conference on solid state devices and materials (SSDM 2015) 2015年9月

  54. Influence of miniaturization of the CoFe/MgO/n+-Si devices on magnitude of magnetoresistance 査読有り

    Hideyuki Sugiyama, Mizue Ishikawa, Tomoaki Inokuchi, Yoshiaki Saito, Nobuki Tezuka

    International Colloquium on Magnetic Films and Surfaces 2015 (ICMFS 2015) 2015年6月

  55. Spin accumulation and transport signals in Heusler Co2FeSi/MgO/n+-Si on insulator devices 査読有り

    Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Kohei Hamaya, Nobuki Tezuka

    20th International conference on Magnetism (ICM 2015) 2015年6月

  56. Increased uniaxial perpendicular anisotropy in tetragonally distorted FeCo-Ti-N films 査読有り

    Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF APPLIED PHYSICS 117 (17) 17A738 2015年5月

    DOI: 10.1063/1.4916763  

    ISSN:0021-8979

    eISSN:1089-7550

  57. Correlation between amplitude of spin accumulation signals investigated by Hanle effect measurement and effective junction barrier height in CoFe/MgO/n(+)-Si junctions 査読有り

    Y. Saito, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka

    JOURNAL OF APPLIED PHYSICS 117 (17) 17C707 2015年5月

    DOI: 10.1063/1.4907242  

    ISSN:0021-8979

    eISSN:1089-7550

  58. Structural, magnetic and electric transport properties for Co2FeAl0.5Si0.5/n-GaaS junctions 査読有り

    Nobuki Tezuka, Tatsuya Saito, Masashi Matsuura, Satoshi Sugimoto

    Solid State Phenomena 233-234 411-414 2015年

    出版者・発行元: Trans Tech Publications Ltd

    DOI: 10.4028/www.scientific.net/SSP.233-234.411  

    ISSN:1662-9779

  59. Effects of Hydrogenation-Disproportionation-Desorption-Recombination Processing Parameters on the Particle Size of Ultrafine Jet-Milled Nd-Fe-B Powders 査読有り

    Michihide Nakamura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

    MATERIALS TRANSACTIONS 56 (1) 129-134 2015年1月

    DOI: 10.2320/matertrans.M2014273  

    ISSN:1345-9678

    eISSN:1347-5320

  60. Influence of interface roughness in CoFe/MgO/n+-Si junctions on spin accumulation and spin transport signals 査読有り

    Mizue Ishikawa, Hideyuki Sugiyama, Tomoaki Inokuchi, Tetsufumi Tanamoto, Kohei Hamaya, Nobuki Tezuka, Yoshiaki Saito

    59th annual Magnetism & Magnetic Materials Conference (MMM2014) 2014年11月

  61. Comparison of Spin Signals Between 3T Hanle and 4T Non-Local Methods for Co2Fe(Al,Si)/n-GaAs Junctions 査読有り

    Nobuki Tezuka, Tatsuya Saito, Masashi Matsuura, Satoshi Sugimoto

    IEEE TRANSACTIONS ON MAGNETICS 50 (11) 2600204 2014年11月

    DOI: 10.1109/TMAG.2014.2325942  

    ISSN:0018-9464

    eISSN:1941-0069

  62. Effect of Annealing on Magnetic Properties of Ultrafine Jet-Milled Nd-Fe-B Powders 査読有り

    Michihide Nakamura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

    MATERIALS TRANSACTIONS 55 (10) 1582-1586 2014年10月

    DOI: 10.2320/matertrans.MAW201402  

    ISSN:1345-9678

    eISSN:1347-5320

  63. Microstructure and coercivity of nitrided Mn-Sn-based alloys 査読有り

    Masashi Matsuura, Keita Isogai, Keita Shinaji, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF ALLOYS AND COMPOUNDS 605 208-212 2014年8月

    DOI: 10.1016/j.jallcom.2014.03.158  

    ISSN:0925-8388

    eISSN:1873-4669

  64. Large spin-accumulation signal in Si for epitaxial CoFe/highly (100)-textured MgO/Si devices 査読有り

    H. Sugiyama, M. Ishikawa, T. Inokuchi, T. Tanamoto, Y. Saito, N. Tezuka

    SOLID STATE COMMUNICATIONS 190 49-52 2014年7月

    DOI: 10.1016/j.ssc.2014.03.019  

    ISSN:0038-1098

    eISSN:1879-2766

  65. Local magnetoresistance through Si and its bias voltage dependence in ferromagnet/MgO/silicon-on-insulator lateral spin valves 査読有り

    Y. Saito, T. Tanamoto, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka

    JOURNAL OF APPLIED PHYSICS 115 (17) 17C514 2014年5月

    DOI: 10.1063/1.4866699  

    ISSN:0021-8979

    eISSN:1089-7550

  66. Magnetic properties of amorphous Fe-B / spinel-ferrite composite particles prepared by the ferrite plating method 査読有り

    K. Shimba, Y. Hoshi, M. Matsuura, N. Tezuka, S. Sugimoto

    Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 61 S231-S233 2014年

    出版者・発行元: Journal of the Japan Society of Powder and Powder Metallurgy

    DOI: 10.2497/jjspm.61.S231  

    ISSN:0532-8799

  67. Spin injection, detection and local magnetoresistance through Si at room temperature in ferrmagnet/MgO/Si lateral spin valves 招待有り 査読有り

    Y. Saito, M. Ishikawa, T. Inokuchi, H. Sugiyama, T. Tanamoto, N. Tezuka, K. Hamaya

    IEEE International nanoelectronics conference, 2014 (IEEE INEC 2014) 2014年

  68. HDDR法利用によるNd-Fe-B系焼結磁石向け超微細原料粉末作製法の開発

    中村 通秀, 松浦 昌志, 手束 展規, 杉本 諭, 宇根 康裕, 久保 博一, 佐川 眞人

    電気学会 マグネティックス研究会資料,MAG-13-107 25-30 2013年12月2日

  69. Maximum magnitude in bias-dependent spin accumulation signals of CoFe/MgO/Si on insulator devices 査読有り

    M. Ishikawa, H. Sugiyama, T. Inokuchi, T. Tanamoto, K. Hamaya, N. Tezuka, Y. Saito

    JOURNAL OF APPLIED PHYSICS 114 (24) 243904 2013年12月

    DOI: 10.1063/1.4856955  

    ISSN:0021-8979

    eISSN:1089-7550

  70. Local magnetoresistance through Si at room temperature and its bias voltage dependence in CoFe/MgO/SOI lateral spin valves 査読有り

    Y. Saito, T. Tanamoto, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka

    58th Annual Conference on Magnetism and Magnetic Materials (2013 MMM Conference) HB-04 2013年11月

  71. Influence of Heat Treatment on the Microstructure and Magnetic Properties of Mn-Sn-Co-N Alloys 査読有り

    Keita Shinaji, Tsuyoshi Mase, Keita Isogai, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 54 (10) 2007-2010 2013年10月

    DOI: 10.2320/matertrans.MAW201312  

    ISSN:1345-9678

    eISSN:1347-5320

  72. Spin injection, transport, and detection at room temperature in a lateral spin transport device with Co2FeAl0.5Si 0.5/n-GaAs schottky tunnel junctions 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    Applied Physics Express 6 (10) 103006 2013年10月

    DOI: 10.7567/APEX.6.103006  

    ISSN:1882-0778 1882-0786

  73. Four-terminal nonlocal signals in lateral spin transport devices with variously ordered Co2FeAl0.5Si0.5 full-Heusler alloy electrodes 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    Applied Physics Letters 103 (12) 122401 2013年9月16日

    DOI: 10.1063/1.4821451  

    ISSN:0003-6951

  74. Correlation between the intensities of differential conductance curves and the spin accumulation signals in Si for CoFe/MgO/SOI devices 査読有り

    M. Ishikawa, T. Inokuchi, H. Sugiyama, K. Hamaya, N. Tezuka, Y. Saito

    International conference on solid state devices and materials (SSDM2013) 2013年9月

  75. Crystal Structures and Spin Injection Signals of Si/Mg/MgO/Co2FeAl0.5Si0.5 Junctions 査読有り

    Takashi Onodera, Masahiro Yoshida, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto, Yoshiaki Saito

    MATERIALS TRANSACTIONS 54 (8) 1392-1395 2013年8月

    DOI: 10.2320/matertrans.M2013139  

    ISSN:1345-9678

    eISSN:1347-5320

  76. Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes 査読有り

    Michihide Nakamura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

    APPLIED PHYSICS LETTERS 103 (2) 22404 2013年7月

    DOI: 10.1063/1.4813399  

    ISSN:0003-6951

  77. Non-Local and Local Spin Signals in a Lateral Spin Transport Device With Co2FeAl0.5Si0.5/n-GaAs Schottky Tunnel Junctions 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    IEEE TRANSACTIONS ON MAGNETICS 49 (7) 4327-4330 2013年7月

    DOI: 10.1109/TMAG.2013.2248053  

    ISSN:0018-9464

    eISSN:1941-0069

  78. Microwave absorption properties of polymer composites with amorphous Fe-B and Ni-Zn-Co ferrite nanoparticles 査読有り

    Kazuaki Shimba, Shozo Yuki, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY 62 (12) 2123-2127 2013年7月

    DOI: 10.3938/jkps.62.2123  

    ISSN:0374-4884

  79. Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes 査読有り

    Michihide Nakamura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

    APPLIED PHYSICS LETTERS 103 (2) 022404 2013年7月

    DOI: 10.1063/1.4813399  

    ISSN:0003-6951

  80. Three-Terminal Hanle Signals in Schottky Tunnel Junctions with Co2FeAl0.5Si0.5 Full-Heusler Alloy Electrodes Deposited at Various Temperatures 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    JAPANESE JOURNAL OF APPLIED PHYSICS 52 (6) UNSP 063001 2013年6月

    DOI: 10.7567/JJAP.52.063001  

    ISSN:0021-4922

    eISSN:1347-4065

  81. Three-Terminal Hanle Signals in Schottky Tunnel Junctions with Co2FeAl0.5Si0.5 Full-Heusler Alloy Electrodes Deposited at Various Temperatures 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    JAPANESE JOURNAL OF APPLIED PHYSICS 52 (6) 2013年6月

    DOI: 10.7567/JJAP.52.063001  

    ISSN:0021-4922

    eISSN:1347-4065

  82. Si基板上への(001)配向MgO薄膜の作製 査読有り

    小野寺学史, 吉田昌弘, 手束展規, 杉本諭, 斉藤好昭

    日本金属学会誌 77 (3) 89-93 2013年3月

    DOI: 10.2320/jinstmet.77.89  

    ISSN:0021-4876

  83. Si上に作製したCo2FeAl0.5Si0.5フルホイスラー合金薄膜の結晶構造とスピン伝導特性 査読有り

    吉田昌弘, 小野寺学史, 手束展規, 杉本諭, 斉藤好昭

    日本金属学会誌 77 (3) 85-88 2013年3月

    DOI: 10.2320/jinstmet.77.85  

    ISSN:0021-4876

  84. Crystal structure and spin conduction property of Co2FeAl 0.5Si0.5 full-heusler alloy thin films deposited on Si substrates 査読有り

    Masahiro Yoshida, Takashi Onodera, Nobuki Tezuka, Satoshi Sugimoto, Yoshiaki Saito

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 77 (3) 85-88 2013年3月

    DOI: 10.2320/jinstmet.77.85  

    ISSN:0021-4876

  85. Spin accumulation in Si for CoFe/MgO/Mg/Si-on-insulator devices 査読有り

    H. Sugiyama, M. Ishikawa, T. Inokuchi, H. T. Tanamoto, K. Hamaya, Y. Saito, N. Tezuka

    Joint MMM/Intermag Conference, 2013 2013年1月

  86. Non-local and local spin signals in a lateral spin transport device with Co2FeAl0.5Si0.5/n-GaAs schottky tunnel junctions 査読有り

    Tatsuya Saito, Nobuki Tezuka, Masashi Matsuura, Satoshi Sugimoto

    IEEE Transactions on Magnetics 49 (7) 4327-4330 2013年

    DOI: 10.1109/TMAG.2013.2248053  

    ISSN:0018-9464

  87. Fabrication of (001)-Oriented MgO Thin Films on Si Substrates 査読有り

    Takashi Onodera, Masahiro Yoshida, Nobuki Tezuka, Satoshi Sugimoto, Yoshiaki Saito

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 77 (3) 89-93 2013年

    DOI: 10.2320/jinstmet.77.89  

    ISSN:0021-4876

    eISSN:1880-6880

  88. Magnetic properties of mnbi fine particles fabricated using hydrogen plasma metal reaction 査読有り

    Keita Isogai, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    Materials Transactions 54 (9) 1673-1677 2013年

    DOI: 10.2320/matertrans.MAW201306  

    ISSN:1345-9678

  89. Fabrication of (001)-Oriented MgO Thin Films on Si Substrates 査読有り

    Takashi Onodera, Masahiro Yoshida, Nobuki Tezuka, Satoshi Sugimoto, Yoshiaki Saito

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 77 (3) 89-93 2013年

    DOI: 10.2320/jinstmet.77.89  

    ISSN:0021-4876

    eISSN:1880-6880

  90. Microstructure and magnetic properties of Mn-Sn-N and Mn-Sn-Co-N alloys 査読有り

    Keita Isogai, Keita Shinaji, Tsuyoshi Mase, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    Materials Transactions 54 (7) 1236-1239 2013年

    DOI: 10.2320/matertrans.M2013113  

    ISSN:1345-9678

  91. Evaluation of the Microstructural Contribution to the Coercivity of Fine-Grained Nd-Fe-B Sintered Magnets 査読有り

    T.Fukada, R.Goto, M.Matsuura, S.Sugimoto, N.Tezuka, Y.Une, M.Sagawa

    Materials Transactions 53 (11) 1967-1971 2012年11月

    DOI: 10.2320/matertrans.MAW201207  

  92. Spin-Based MOSFETs for Logic and Memory Applications and Spin Accumulation Signals in CoFe/Tunnel Barrier/SOI Devices 査読有り

    Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Tetsufumi Tanamoto, Kohei Hamaya, Nobuki Tezuka

    IEEE TRANSACTIONS ON MAGNETICS 48 (11) 2739-2745 2012年11月

    DOI: 10.1109/TMAG.2012.2202277  

    ISSN:0018-9464

    eISSN:1941-0069

  93. New materials research for high spin polarized current 招待有り 査読有り

    Nobuki Tezuka

    Journal of Magnetism and Magnetic Materials 324 (21) 3588-3592 2012年10月

    DOI: 10.1016/j.jmmm.2012.02.097  

    ISSN:0304-8853

  94. New materials research for high spin polarized current 招待有り 査読有り

    Nobuki Tezuka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 324 (21) 3588-3592 2012年10月

    DOI: 10.1016/j.jmmm.2012.02.097  

    ISSN:0304-8853

    eISSN:1873-4766

  95. Enhancement of Coercivity of Zn-bonded Sm-Fe-N Magnets Prepared by Hot-rolling

    D. Ishihara, M. Matsuura, N. Tezuka, S. Sugimoto

    Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications (REPM’ 12), Edited by S. Sugimoto and M. Nakano 292-295 2012年9月2日

  96. Crystal Structure and Lattice Constant of Nd-rich Phase in Nd-Fe-B Films

    M. Matsuura, N. Tezuka, S. Sugimoto

    Proceedings of the 22nd International Workshop on Rare-Earth Permanent Magnets and their Applications (REPM’ 12), Edited by S. Sugimoto and M. Nakano 403-406 2012年9月2日

  97. Asymmetric bias voltage dependence in spin accumulation signals observed by the three-terminal Hanle measurements for CoFe/MgO/SOI devices 査読有り

    M. Ishikawa, T. Inokuchi, H. Sugiyama, T. Tanamoto, K. Hamaya, N. Tezuka, Y. Saito

    International conference on Solid State Devices and Materials (SSDM2012) 2012年9月

  98. Microwave Absorption Properties of Highly Filled Polymer Composites with Amorphous Fe-B Particles 査読有り

    Kiyotaka Furuta, Kazuaki Shimba, Nobuki Tezuka, Satoshi Sugimoto

    Material Transaction 53 (9) 1665-1668 2012年8月25日

    DOI: 10.2320/matertrans.MAW201203  

  99. Anisotropy and Damping in CoFeAlSi via Electrical Detection of Ferromagnetic Resonance 査読有り

    Lihui Bai, N. Tezuka, M. Kohda, J. Nitta

    Jpn. Appl. Phys. 51 083001-1-083001-5 2012年7月31日

    DOI: 10.1143/JJAP.51.083001  

  100. Microwave Absorption Properties of Resin Composites with Amorphous Fe-B Particles 査読有り

    Shozo Yuki, Kazuaki Shimba, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 76 (4) 278-282 2012年4月

    ISSN:0021-4876

    eISSN:1880-6880

  101. Microstructure evaluation for Dy-free Nd-Fe-B sintered magnets with high coercivity 査読有り

    R. Goto, M. Matsuura, S. Sugimoto, N. Tezuka, Y. Une, M. Sagawa

    JOURNAL OF APPLIED PHYSICS 111 (7) 07A739 2012年4月

    DOI: 10.1063/1.3680190  

    ISSN:0021-8979

    eISSN:1089-7550

  102. アモルファスFe-B 粒子樹脂複合体の電磁波吸収特性 査読有り

    結城翔三, 榛葉和晃, 手束展規, 杉本諭

    日本金属学会誌 76 (4) 278-282 2012年4月

    DOI: 10.2320/jinstmet.76.278  

    ISSN:0021-4876

  103. Spin injection and detection between CoFe/AlOx junctions and SOI investigated by Hanle effect measurements 査読有り

    Tomoaki Inokuchi, Mizue Ishikawa, Hideyuki Sugiyama, Yoshiaki Saito, Nobuki Tezuka

    JOURNAL OF APPLIED PHYSICS 111 (7) 07C316 2012年4月

    DOI: 10.1063/1.3677930  

    ISSN:0021-8979

    eISSN:1089-7550

  104. Temperature and Bias Voltage Dependencies of Spin Injection Signals for CO2FeAl0.5Si0.5/n-GaAs Schottky Tunnel Junction 査読有り

    Tatsuya Saito, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 53 (4) 641-644 2012年4月

    DOI: 10.2320/matertrans.MBW201113  

    ISSN:1345-9678

    eISSN:1347-5320

  105. Tunnel magnetoresistance effect in magnetic tunnel junctions with epitaxial Co 2FeAl 0.5Si 0.5 Heusler electrodes on MgO (110) single substrates 査読有り

    N. Tezuka, F. Mitsuhashi, S. Sugimoto

    Journal of Applied Physics 111 (7) 07C718 2012年4月1日

    DOI: 10.1063/1.3678586  

    ISSN:0021-8979

  106. Magnetic and microwave absorption properties of polymer composites with amorphous Fe-B/Ni-Zn ferrite nanoparticles 査読有り

    Kazuaki Shimba, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS 177 (2) 251-256 2012年2月

    DOI: 10.1016/j.mseb.2011.12.002  

    ISSN:0921-5107

  107. Nd-Fe-B薄膜におけるNd2Fe14B/Nd-Rich界面組織と保磁力 査読有り

    松浦昌志, 後藤龍太, 手束展規, 杉本諭

    日本金属学会誌 76 (1) 65-71 2012年1月

    DOI: 10.2320/jinstmet.76.65  

    ISSN:0021-4876

    eISSN:1880-6880

  108. Correlation between symmetry-selective transport and spin-dependent resonant tunneling in fully epitaxial Cr/ultrathin-Fe/MgO/Fe(001) magnetic tunnel junctions 査読有り

    Tomohiko Niizeki, Hiroaki Sukegawa, Seiji Mitani, Nobuki Tezuka, Koichiro Inomata

    APPLIED PHYSICS LETTERS 99 (18) 182508 2011年10月

    DOI: 10.1063/1.3647578  

    ISSN:0003-6951

    eISSN:1077-3118

  109. Transmission Electron Microscopy Study on Nd-Rich Phase at the Surface of Nd2Fe14B Phase in Nd-Fe-B Films 査読有り

    Masashi Matsuura, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    IEEE TRANSACTIONS ON MAGNETICS 47 (10) 3273-3275 2011年10月

    DOI: 10.1109/TMAG.2011.2148111  

    ISSN:0018-9464

  110. Electrical Transport Properties and Spin Injection in Co2FeAl0.5Si0.5/GaAs Junctions 査読有り

    Tatsuya Saito, Nobuki Tezuka, Satoshi Sugimoto

    IEEE TRANSACTIONS ON MAGNETICS 47 (10) 2447-2450 2011年10月

    DOI: 10.1109/TMAG.2011.2153189  

    ISSN:0018-9464

  111. Microwave Absorption Properties of Polymer Modified Ni-Zn Ferrite Nanoparticles 査読有り

    Kazuaki Shimba, Kiyotaka Furuta, Nobuyuki Morimoto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 52 (4) 740-745 2011年4月

    DOI: 10.2320/matertrans.MBW201013  

    ISSN:1345-9678

    eISSN:1347-5320

  112. Magnetoresistance effect of tunnel junctions using Co-2(Ti, Mn)Z (Z = Al, Si) Heusler alloys 査読有り

    A. Sasaki, N. Tezuka, L. Jiang, S. Sugimoto

    JOURNAL OF APPLIED PHYSICS 109 (7) 07C736 2011年4月

    DOI: 10.1063/1.3556778  

    ISSN:0021-8979

    eISSN:1089-7550

  113. Magnetic Properties of Nanoparticle-Polymer Composites Prepared Using Surface Modification and Cross-Linking Reaction 査読有り

    Kazuaki Shimba, Kiyotaka Furuta, Nobuyuki Morimoto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 52 (3) 486-490 2011年3月

    DOI: 10.2320/matertrans.MAW201020  

    ISSN:1345-9678

    eISSN:1347-5320

  114. MBEによりSi基板上に成膜されたCo2FeAl0.5Si0.5薄膜の結晶構造と磁気特性 査読有り

    Tatsuya Saito, Nobuki Tezuka, Satoshi Sugimoto

    日本金属学会誌 75 (3) 141-145 2011年3月

    DOI: 10.2320/jinstmet.75.141  

    ISSN:0021-4876

  115. Structural and Magnetic Properties of Co2FeAl0.5Si0.5 Full-Heusler Alloy Thin Films on GaAs Substrates 査読有り

    Tatsuya Saito, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 52 (3) 370-373 2011年3月

    DOI: 10.2320/matertrans.MBW201004  

    ISSN:1345-9678

    eISSN:1347-5320

  116. Structural and Magnetic Properties of Co2FeAl0.5Si0.5 Full-Heusler Alloy Thin Films Deposited on Si Substrates by Molecular Beam Epitaxy 査読有り

    Tatsuya Saito, Ken Kano, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 75 (3) 141-145 2011年3月

    DOI: 10.2320/jinstmet.75.141  

    ISSN:0021-4876

    eISSN:1880-6880

  117. Magnetoresistance Effect through GaAs for Fe/MgO/GaAs/MgO/Fe Junctions 査読有り

    N. Tezuka, F. Mitsuhashi, S. Sugimoto

    2ND INTERNATIONAL SYMPOSIUM ON ADVANCED MAGNETIC MATERIALS AND APPLICATIONS (ISAMMA 2010) 266 2011年

    DOI: 10.1088/1742-6596/266/1/012109  

    ISSN:1742-6588

  118. Preparation and magnetic properties of amorphous Co-Fe-B nanoparticles 査読有り

    Kazuaki Shimba, Nobuki Tezuka, Satoshi Sugimoto

    Journal of Physics: Conference Series 266 012044-012044-4 2011年1月

    DOI: 10.1088/1742-6596/266/1/012044  

  119. Nd-Fe-B sintered magnets fabrication by using atomized powders 査読有り

    Ryota Goto, Satoshi Sugimoto, Masashi Matsuura, Nobuki Tezuka, Yasuhiro Une, Masato Sagawa

    Journal of Physics; Conference Series 266 012029 2011年1月

    DOI: 10.1088/1742-6596/266/1/012029  

  120. Influence of microstructural change of the interface between Nd2Fe14B and Nd-O phases on coercivity of Nd-Fe-B films by oxidation and subsequent low-temperature annealing

    Masashi Matsuura, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    Journal of Physics; Conference Series 266 012039 2011年1月

    DOI: 10.1088/1742-6596/266/1/012039  

  121. Spin injection and detection between CoFe/AlOx junctions and SOI investigates by Hanle effect measurements 査読有り

    TTT

    JOURNAL OF THE JAPAN INSTITUTE OF METALSfff 75 141-145 2011年

  122. Influence of Nd Oxide Phase on the Coercivity of Nd-Fe-B Thin Films 査読有り

    Masashi Matsuura, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 51 (10) 1901-1904 2010年10月

    DOI: 10.2320/matertrans.MAW201019  

    ISSN:1345-9678

    eISSN:1347-5320

  123. Coフェライト複合ナノ粒子の作製 査読有り

    深町七奈, 手束展規, 杉本諭

    日本金属学会誌 74 (6) 345-350 2010年6月

    DOI: 10.2320/jinstmet.74.345  

    ISSN:0021-4876

  124. 溶融硝酸鉄の還元による窒化鉄Fe16N2 微粒子の作製 査読有り

    榛葉和晃, 手束展規, 杉本 諭

    日本金属学会誌 74 (3) 209-213 2010年3月

    DOI: 10.2320/jinstmet.74.209  

    ISSN:0021-4876

    eISSN:1880-6880

  125. Microstructure During the Fabrication Process of Nd-Fe-B Sintered Magnets Using Atomized Powders

    Ryota Goto, Satoshi Sugimoto, Masashi Matsuura, Nobuki Tezuka, Yasuhiro Une, Masato Sagawa

    Proceeding of the 21st Workshop on Rare-Earth Permanent Magnets and their applications (REPM' 10), Bled, Slovenia, 29 Augast -2 September 2010 193-196 2010年

  126. Influence of Nd2Fe14B/Nd(-O) Interfacial Microstructure on Coercivity in Nd-Fe-B Thin Films

    Masashi Matsuura, Satoshi Sugimoto, Ryota Goto, Nobuki Tezuka

    Proceeding of the 21st Workshop on Rare-Earth Permanent Magnets and their applications (REPM' 10), Bled, Slovenia, 29 Augast -2 September 2010 317-319 2010年

  127. Preparation of Composite Nanoparticles Based on Cobalt Ferrite

    Nana Fukamachi, Nobuki Tezuka, Sugimoto Sugimoto

    Journal of the JAPAN Institute of METALS 74 745-750 2010年

  128. 表面修飾された磁性ナノ粒子によるナノコンポジット粉末の作製 査読有り

    榛葉和晃, 深町七奈, 手束展規, 杉本諭

    電気学会研究会資料 MAGマグネティックス研究会 71 (71) 7-12 2010年

  129. Nd-Fe-B薄膜の保磁力に及ぼす酸化状態とCu添加の影響

    松浦昌志, 深田東吾, 後藤龍太, 手束展規, 杉本 諭

    電気学会 マグネティックス研究会資料 MAG-09-184 77-81 2009年12月1日

  130. Microstructural Evaluation of Nd-Fe-B Jet-Milled Powders 査読有り

    Takashi Hattori, Hiroki Ishihara, Satoshi Sugimoto, Ryota Goto, Nobuki Tezuka, Yasuhiro Une, Masato Sagawa

    MATERIALS TRANSACTIONS 50 (10) 2347-2350 2009年10月

    DOI: 10.2320/matertrans.MAW200915  

    ISSN:1345-9678

    eISSN:1347-5320

  131. Co2Ti0.5Mn0.5Alフルホイスラー合金薄膜を用いた強磁性トンネル接合の磁気抵抗効果 査読有り

    佐々木陽光, 手束展規, 杉本 諭, 大久保亮成, 梅津理恵, 貝沼亮介

    日本金属学会誌 73 (9) 670-673 2009年9月

    DOI: 10.2320/jinstmet.73.670  

    ISSN:0021-4876

    eISSN:1880-6880

  132. Influences of Oxidation State of Nd-Rich Phase on the Coercivity of Nd-Fe-B/Nd Thin Films 査読有り

    Masashi Matsuura, Togo Fukada, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 50 (9) 2139-2142 2009年9月

    DOI: 10.2320/matertrans.MAW200913  

    ISSN:1345-9678

    eISSN:1347-5320

  133. Nd-Fe-B/Nd薄膜における酸化状態と保磁力

    松浦昌志, 深田東吾, 後藤龍太, 手束展規, 杉本諭

    電気学会マグネティックス研究会資料 MAG-09-71 50-53 2009年8月5日

  134. Coフェライト系ナノコンポジット粉末の磁気特性

    深町七奈, 手束展規, 杉本諭

    電気学会マグネティックス研究会資料 MAG-09-71 65-68 2009年8月

  135. Effect of Cu Addition on the Phase Equilibria in Nd-Fe-B Sintered Magnets 査読有り

    Shota Nishio, Satoshi Sugimoto, Ryota Goto, Masashi Matsuura, Nobuki Tezuka

    MATERIALS TRANSACTIONS 50 (4) 723-726 2009年4月

    DOI: 10.2320/matertrans.MBW200824  

    ISSN:1345-9678

    eISSN:1347-5320

  136. Interfacial state and magnetic properties of Nd-Fe-B/Nd thin films 査読有り

    Masashi Matsuura, Satoshi Sugimoto, Ryota Goto, Nobuki Tezuka

    JOURNAL OF APPLIED PHYSICS 105 (7) 07A741-1-07A741-3 2009年4月

    DOI: 10.1063/1.3076050  

    ISSN:0021-8979

  137. Tunnel magnetoresistance for magnetic tunnel junctions with Co2FeAl0.5Si0.5 full Heusler electrodes fabricated by molecular beam epitaxy system 査読有り

    N. Tezuka, N. Ikeda, F. Mitsuhashi, S. Sugimoto

    JOURNAL OF APPLIED PHYSICS 105 (7) 07C925-1-07C925-3 2009年4月

    DOI: 10.1063/1.3072448  

    ISSN:0021-8979

    eISSN:1089-7550

  138. The Magnetoresistance of Fe/MgO/GaAs/MgO/Fe Junctions 査読有り

    Fuminori Mitsuhash, Nobuki Tezuka, Satoshi Sugimoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 73 (4) 251-254 2009年4月

    DOI: 10.2320/jinstmet.73.251  

    ISSN:0021-4876

    eISSN:1880-6880

  139. Improved tunnel magnetoresistance of magnetic tunnel junctions with Heusler Co2FeAl0.5Si0.5 electrodes fabricated by molecular beam epitaxy 査読有り

    N. Tezuka, N. Ikeda, F. Mitsuhashi, S. Sugimoto

    APPLIED PHYSICS LETTERS 94 (16) 162504-1-162504-3 2009年4月

    DOI: 10.1063/1.3116717  

    ISSN:0003-6951

  140. エアロゾルデポジション法により作製されたFe/Y2O3 積層膜の高周波特性 査読有り

    榊昭光, 手束展規, 杉本諭

    Journal of the Magnetics Society of Japan 33 (3) 252-253 2009年3月

    DOI: 10.3379/msjmag.0903RD8076  

  141. Microstructural Evaluation of Nd-Fe-B Strip Cast Alloys 査読有り

    Takashi Hattori, Nana Fukamachi, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    MATERIALS TRANSACTIONS 50 (3) 479-482 2009年3月

    DOI: 10.2320/matertrans.MBW200821  

    ISSN:1345-9678

    eISSN:1347-5320

  142. Temperature and Bias Voltage Dependence of Tunnel Magnetoresistance Effect in Magnetic Tunnel Junctions with Co2Fe(Al,Si) Electrodes Fabricated by MBE 査読有り

    N. Tezuka, T. Saito, K. Kikuchi, A. Sasaki, F. Mitsuhashi, N. Ikeda, S.Sugimoto, T. Takenaga

    Journal of Physics: conference series 2009年

    DOI: 10.1088/1742-6596/200/5/052028  

  143. Effect of Cu Addition on Coercivity and Interfacial State of Nd-Fe-B/Nd-rich Thin Films 査読有り

    Masashi Matsuura, Togo Fukada, Ryota Goto, Nobuki Tezuka, Satoshi Sugimoto

    Jornal of Physics, Conference Series. 200 082019 2009年

    DOI: 10.1088/1742-6596/200/8/082019  

  144. Nd-Fe-B系合金におけるNd2Fe14B相とNd-rich相間の濡れ性 査読有り

    西尾翔太, 後藤龍太, 松浦昌志, 手束展規, 杉本 諭

    日本金属学会誌 72 (12) 1010-1014 2008年12月

    DOI: 10.2320/jinstmet.72.1010  

    ISSN:0021-4876

    eISSN:1880-6880

  145. Wettability and Interfacial Microstructure Between Nd2Fe14B and Nd-Rich Phases in Nd-Fe-B Alloys 査読有り

    Ryota Goto, Shota Nishio, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto

    IEEE TRANSACTIONS ON MAGNETICS 44 (11) 4232-4234 2008年11月

    DOI: 10.1109/TMAG.2008.2001544  

    ISSN:0018-9464

  146. Search for new superconductors by the Li-intercalation into layered perovskites of the Aurivillius phase 査読有り

    Tezuka, H. Kato, M. Kajita, T. Noji, T. Koike

    Physica C 468 (15-20) 1152-1154 2008年9月15日

    DOI: 10.1016/j.physc.2008.05.020  

  147. Influence of Dy addition on wettability between Nd2Fe14B and Nd-rich phases in Nd-Fe-B alloys 招待有り

    R. Goto, S. Nishio, M. Matsuura, S. Sugimoto, N. Tezuka

    Proceedings of 20th International Workshop on Rare Earth Permanent Magnet and Their Applications 118-121 2008年9月8日

  148. Site disorder in Co2Fe(Al,Si) Heusler alloys and its influence on junction tunnel magnetoresistance 査読有り

    K. Inomata, M. Wojcik, E. Jedryka, N. Ikeda, N. Tezuka

    PHYSICAL REVIEW B 77 (21) 214425-1-214425-9 2008年6月

    DOI: 10.1103/PhysRevB.77.214425  

    ISSN:2469-9950

    eISSN:2469-9969

  149. Energy barrier and reversal mechanism in Co/Pt multilayer nanodot 査読有り

    S. Okamoto, T. Kato, N. Kikuchi, O. Kitakami, N. Tezuka, S. Sugimoto

    JOURNAL OF APPLIED PHYSICS 103 (7) 07C501-1-07C501-3 2008年4月

    DOI: 10.1063/1.2831785  

    ISSN:0021-8979

  150. Magnetization reversal process and bistability of Co/Pt multilayer dot 査読有り

    N. Kikuchi, T. Kato, S. Okamoto, O. Kitakami, N. Tezuka, S. Sugimoto

    JOURNAL OF APPLIED PHYSICS 103 (7) 07C510-1-07C510-3 2008年4月

    DOI: 10.1063/1.2838288  

    ISSN:0021-8979

  151. Enhanced tunnel magnetoresistance due to spin dependent quantum well resonance in specific symmetry states of an ultrathin ferromagnetic electrode 査読有り

    Tomohiko Niizeki, Nobuki Tezuka, Koichiro Inomata

    PHYSICAL REVIEW LETTERS 100 (4) 047207-1-047207-4 2008年2月

    DOI: 10.1103/PhysRevLett.100.047207  

    ISSN:0031-9007

    eISSN:1079-7114

  152. Effect of Cu addition on the phase equilibria in Nd-Fe-B sintered magnets 査読有り

    R. Goto, S. Nishio, M. Matsuura, N. Tezuka, S. Sugimoto

    IEEE Trans. Magn. 44 4232-4234 2008年

  153. Highly spin-polarized materials and devices for spintronics 査読有り

    Koichiro Inomata, Naomichi Ikeda, Nobuki Tezuka, Ryogo Goto, Satoshi Sugimoto, Marek Wojcik, Eva Jedryka

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 9 (1) 014101 2008年1月

    DOI: 10.1088/1468-6996/9/1/014101  

    ISSN:1468-6996

    eISSN:1878-5514

  154. エアロゾル・デポジション法によるFe/酸化物複合膜の作製

    野口真純, 峯田真悟, 手束展規, 杉本諭, 明渡純

    電気学会 マグネティックス研究会資料 MAG-07-74 15-18 2007年7月24日

  155. Co2FeAl1-xSixフルホイスラー合金薄膜の結晶構造と磁気特性

    池田直路, 手束展規, 杉本諭

    電気学会 マグネティックス研究会資料 MAG-07-73 11-14 2007年7月24日

  156. Fabrication and characterization of Co-ferrite thin films for a ferromagnetic barrier in a spin-filtering device operating at room temperature 査読有り

    R. Goto, Y. K. Takahashi, N. Tezuka, K. Inomata, S. Sugimoto, K. Hono

    IEEE TRANSACTIONS ON MAGNETICS 43 (6) 2797-2799 2007年6月

    DOI: 10.1109/TMAG.2007.893696  

    ISSN:0018-9464

  157. Transmission electron microscopy of Co-2(Cr1-xFex)Al sputtered films and their magnetic tunneling junctions 査読有り

    Y. K. Takahashi, T. Ohkubo, K. Hono, S. Okamura, N. Tezuka, K. Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 313 (2) 378-382 2007年6月

    DOI: 10.1016/j.jmmm.2006.09.023  

    ISSN:0304-8853

  158. Giant tunnel magnetoresistance at room temperature for junctions using full-heusler Co2FeAl0.5Si0.5 electrodes 査読有り

    Nobuki Tezuka, Naomichi Ikeda, Satoshi Sugimoto, Koichiro Inomata

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 46 (17-19) L454-L456 2007年5月

    DOI: 10.1143/JJAP.46.L454  

    ISSN:0021-4922

  159. Tunnel magnetoresistance in magnetic tunnel junctions with Co2Fe (Al, Si) full-Heusler films 査読有り

    N. Tezuka, N. Ikeda, A. Miyazaki, S. Okamura, M. Kikuchi, S. Sugimoto, K. Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 (2) 1940-1942 2007年3月

    DOI: 10.1016/j.jmmm.2006.10.812  

    ISSN:0304-8853

  160. Preparation of Fe/Ni-Zn-Cu ferrite stacked films by aerosol deposition method 査読有り

    S. Sugimoto, V. Chan, M. Noguchi, N. Tezuka, K. Inomata, J. Akedo

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 (2) 2549-2551 2007年3月

    DOI: 10.1016/j.jmmm.2006.11.146  

    ISSN:0304-8853

  161. Structural, magnetic and barrier properties for co-ferrite thin films fabricated by plasma oxidization 査読有り

    Ryota Goto, Yukiko Takahashi, Nobuki Tezuka, Koichiro Inomata, Satoshi Sugimoto, Kazuhiro Hono

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 71 (2) 258-262 2007年2月

    ISSN:0021-4876

    eISSN:1880-6880

  162. プラズマ酸化法により作製したCoフェライト薄膜の構造、磁気およびバリア特性 査読有り

    後藤龍太, 高橋有紀子, 手束展規, 猪俣浩一郎, 杉本諭, 宝野和博

    日本金属学会誌 71 (2) 258-262 2007年2月

    DOI: 10.2320/jinstmet.71.258  

    ISSN:0021-4876

  163. Coercivity and microstructure of Mn-Ni-N sintered alloys 招待有り 査読有り

    S. Sugimoto, K. Isogai, T. Hattori, H. Matsumoto, S. Yoshida, N. Tezuka

    PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4, NO 12 4 (12) 4573-+ 2007年

    DOI: 10.1002/psse.200777401  

    ISSN:1862-6351

  164. プラズマ酸化法により作製したCoフェライト薄膜の構造と磁気特性 査読有り

    後藤龍太, 高橋有紀子, 中村新一, 手束展規, 猪俣浩一郎, 杉本諭, 宝野和博

    日本応用磁気学会誌 31 (4) 351-355 2007年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.31.351  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    For the development of room temperature spin-filtering devices with a ferromagnetic barrier, very thin ferromagnetic barrier films were required. Co-ferrite thin films are prepared by the surface plasma oxidization of a CoFe2 underlayer deposited on MgO (001) single crystal substrates. During oxidization, the substrate temperature was varied from 523 K to 673 K. The plasma oxidized CoFe2 films had a spinel structure, 4-fold symmetry in the plane, and an epitaxial relationship with the CoFe2 underlayer. The lattice parameter of Co-ferrite thin film was 0.828 nm, which is 1.2% less than that of bulk. The interface between the CoFe2 and its oxide was relatively smooth. When the substrate temperature during plasma oxidization was lower than 623 K, magnetization of CoFe2 and Co-ferrite rotated independently. XPS and MOKE measurements identified that the hard and soft phases as Co-ferrite and CoFe2, respectively. Measurements of the magnetic properties showed that the magnetization of the Co-ferrite thin films was about 1100 emu/cm3, which is 2.6 times more than that of bulk (420 emu/cm3). This phenomenon may be explained by the exchange of Co and Fe cation distribution in our Co-ferrite films.

  165. 175% tunnel magnetoresistance at room temperature and high thermal stability using Co2FeAl0.5Si0.5 full-Heusler alloy electrodes 査読有り

    N. Tezuka, N. Ikeda, S. Sugimoto, K. Inomata

    APPLIED PHYSICS LETTERS 89 (25) 2006年12月

    DOI: 10.1063/1.2420793  

    ISSN:0003-6951

  166. エアロゾル・デポジション法によるFe/NiZnCuフェライト複合膜の成膜過程

    野口真純, 峯田真悟, 手束展規, 杉本諭, 明渡純

    電気学会研究会資料 金属・セラミックス、マグネティックス合同研究会 MC-06-9~16/MAG-06-159~166 11-15 2006年11月29日

  167. 永久磁石材料とスピントロニクス 招待有り

    手束展規, 杉本 諭

    金属 76 (10) 57-61 2006年10月1日

  168. Current-driven resistance oscillation in exchange-biased spin valves with a low aspect ratio 査読有り

    Y. Jiang, N. Tezuka, K. Inomata

    APPLIED PHYSICS LETTERS 89 (12) 122514-1-122514-3 2006年9月

    DOI: 10.1063/1.2356376  

    ISSN:0003-6951

  169. Tunnel magnetoresistance for junctions with epitaxial full-Heusler Co2FeAl0.5Si0.5 electrodes with B2 and L2(1) structures 査読有り

    N. Tezuka, N. Ikeda, A. Miyazaki, S. Sugimoto, M. Kikuchi, K. Inomata

    APPLIED PHYSICS LETTERS 89 (11) 112514-1-112514-3 2006年9月

    DOI: 10.1063/1.2354026  

    ISSN:0003-6951

    eISSN:1077-3118

  170. Spin polarization of Co2FeSi full-Heusler alloy and tunneling magnetoresistance of its magnetic tunneling junctions 査読有り

    Z. Gercsi, A. Rajanikanth, Y. K. Takahashi, K. Hono, M. Kikuchi, N. Tezuka, K. Inomata

    APPLIED PHYSICS LETTERS 89 (8) 082512-1-082512-3 2006年8月

    DOI: 10.1063/1.2338025  

    ISSN:0003-6951

    eISSN:1077-3118

  171. Indirect exchange spring between FePt and Fe with a Ru interlayer 査読有り

    J Jiang, N Tezuka, K Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 302 (1) 40-46 2006年7月

    DOI: 10.1016/j.jmmm.2005.08.009  

    ISSN:0304-8853

  172. Structural dependence of the tunnel magnetoresistance for magnetic tunnel junctions with a full-Heusler Co2Fe(Al,Si) electrode 査読有り

    N. Tezuka, S. Okamura, A. Miyazaki, M. Kikuchi, K. Inomata

    JOURNAL OF APPLIED PHYSICS 99 (8) 08T314 -1-08T314 -3 2006年4月

    DOI: 10.1063/1.2167069  

    ISSN:0021-8979

    eISSN:1089-7550

  173. Structural and magnetic properties and tunnel magnetoresistance for Co-2(Cr,Fe)Al and Co2FeSi full-Heusler alloys 査読有り

    K Inomata, S Okamura, A Miyazaki, M Kikuchi, N Tezuka, M Wojcik, E Jedryka

    JOURNAL OF PHYSICS D-APPLIED PHYSICS 39 (5) 816-823 2006年3月

    DOI: 10.1088/0022-3727/39/5/S07  

    ISSN:0022-3727

    eISSN:1361-6463

  174. Epitaxial Growth of Ordered Co2(Cr1-xFex)Al Full-Heusler Alloy Films on Single Crystal Substrates 査読有り

    Susumu Okamura, Aya Miyazaki, Nobuki Tezuka, Satoshi Sugimoto, Koichiro Inomata

    Materials Transactions 47 (1) 15-19 2006年1月

    DOI: 10.2320/matertrans.47.15  

  175. Quantum oscillation of the tunneling conductance in fully epitaxial double barrier magnetic tunnel junctions 査読有り

    T Nozaki, N Tezuka, K Inomata

    PHYSICAL REVIEW LETTERS 96 (2) 027208-1-027208-4 2006年1月

    DOI: 10.1103/PhysRevLett.96.027208  

    ISSN:0031-9007

    eISSN:1079-7114

  176. ナノドットFe中間層を有するエピタキシャル強磁性2重トンネル接合におけるコンダクタンスの振動現象 査読有り

    野崎 隆行, 中村 新一, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会誌 30 (2) 180-183 2006年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.180  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    Double-barrier magnetic tunnel junctions (DMTJs) with an Fe(001) / MgO(001) / Fe(001) / MgO(001) / Fe(001) structure were deposited upon MgO(001) substrates by using molecular beam epitaxy. The DMTJs were found to show the TMR ratio of up to 110% and an extremely small bias voltage dependence (V1/2 = 1.4 V under a positive bias application) at room temperature. We also investigated the middle-layer thickness dependence of the conductance curve in the DMTJs. Clear oscillations of the conductance were observed in a parallel magnetization configuration. This oscillation is thought to originate in the modulation of the tunneling conductance by the spin-polarized quantum well states created in the middle Fe layer.

  177. MgO基板上に作製したCo2V0.67Fe0.33Al薄膜の構造と磁性およびトンネル磁気抵抗 査読有り

    宮崎彩, 岡村進, 杉本諭, 手束展規, 猪俣浩一郎

    日本応用磁気学会誌 30 (3) 378-382 2006年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.378  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    Co2V0.67Fe0.33Al full-Heulser alloy films were fabricated on an MgO (100) single crystalline substrate by using two different heat treatments: substrate heating and post-annealing. Ultra-high-vacuum dc magnetron sputtering was used to prepare the sample. The L21 structure was obtained when the substrate temperature (Ts) was 500°C. For the same sample, the magnetic moment per formula unit showed the highest value of 2.4 μB at 5 K. There were small differences between the samples fabricated by substrate heating and post-annealing in terms of their structural and magnetic properties. A magnetic tunnel junction (MTJ) using Co2V0.67Fe0.33Al as a bottom electrode was fabricated. A larger tunnel magnetoresistance (TMR) was obtained by substrate heating than post-annealing with a maximum value of 28% at RT and 50% at 5 K when the Co2V0.67Fe0.33Al was sputtered at Ts = 500°C. We found that there is an intimate relationship between the lattice constant of Co2V0.67Fe0.33Al and the TMR.

  178. 不規則構造を有するCo2(Cr1-xFex)Alを用いた強磁性トンネル接合のTMR特性 査読有り

    岡村進, 宮崎彩, 手束展規, 杉本諭, 猪俣浩一郎, 高橋有紀子, 宝野和博

    日本応用磁気学会誌 30 (3) 366-369 2006年

    出版者・発行元: 公益社団法人 日本磁気学会

    DOI: 10.3379/jmsjmag.30.366  

    詳細を見る 詳細を閉じる

    Polycrystalline and single crystalline thin films of Co2(Cr1-xFex)Al (x = 0.6, 1) full-Heusler alloys with different disordering were prepared on thermally oxidized Si and MgO(001) substrates, respectively, by the dc magnetron sputtering method. The magnetic tunnel junctions with a polycrystalline and single crystalline B2 type Co2FeAl (x =1) electrode demonstrate TMR of 70% and 75% at 5 K, respectively, which is larger than that of 65% at 5 K for Co75Fe25, indicating that the spin polarization for Co2FeAl is larger than that for Co75Fe25. The TMR for Co2FeAl with both the A2 and the B2, which is controlled by substrate heating, is almost the same, whereas for Co2(Cr0.4Fe0.6)Al the TMR increases with increasing the degree of ordering, corresponding to the first-principles calculations.

  179. 不規則構造を有するCo2(Cr1-xFex)Alフルホイスラー合金を用いた強磁性トンネル接合の磁気抵抗効果 査読有り

    岡村進, 宮崎彩, 手束展規, 杉本諭, 猪俣浩一郎, 高橋有紀子, 宝野和博

    電気学会論文誌A 126 (5) 276-280 2006年

    DOI: 10.1541/ieejfms.126.276  

    ISSN:0385-4205 1347-5533

  180. エアロゾル・デポジッション法により作製したFe/Ni-Zn-Cuフェライト複合膜における組成制御と電磁ノイズ抑制効果 査読有り

    チャンビサル, 杉本諭, 猪俣浩一郎, 手束展規, 明度純

    日本応用磁気学会誌 30 (5) 505-509 2006年

    出版者・発行元:

    DOI: 10.3379/jmsjmag.30.505  

    ISSN:0285-0192

  181. L21構造を持つCo2CrGaフルホイスラー合金薄膜の作製とそれを用いた強磁性トンネル接合素子のトンネル磁気抵抗 査読有り

    正木達章, 菊地麻樹, 手束展規, 杉本諭, 猪俣浩一郎, 貝沼亮介, 石田清仁

    日本応用磁気学会誌 30 (4) 455-458 2006年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.30.455  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    We have investigated that the structural and magnetic properties of Co2CrGa full-Heusler alloy films and researched the tunnel magnetoresistance (TMR) in magnetic tunnel junctions (MTJs) using a Co2CrGa electrode on a MgO(100) substrate. Co2CrGa films were fabricated with substrate heating (RT ≤ Ts ≤ 500°C) or post-annealing (RT ≤ Ta ≤ 500°C) after the deposition using an ultrahigh vacuum dc magnetron sputtering system. L21-ordered Co2CrGa thin films were obtained at Ts ≥ 300°C or Ta ≥ 200°C. The maximum magnetic moment per formula unit measured at 5 K were 2.8 μB and 2.6 μB for TS and Ta = 400°C, respectively, which are over 85% of the theoretical value. The maximum TMR of 18% at RT and 42% at 5 K are obtained for the MTJ using the L21-structured Co2CrGa film as a bottom electrode. It is expected that the TMR can be enhanced by optimizing the interface of Co2CrGa/AlOx.

  182. Magnetic properties of epitaxial Co2Cr1-xFexAl full Heusler alloy thin films with the L2(1) structure 査読有り

    A Hirohata, H Kurebayashi, S Okamura, N Tezuka, K Inomata

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 2802-2804 2005年10月

    DOI: 10.1109/TMAG.2005.854831  

    ISSN:0018-9464

    eISSN:1941-0069

  183. Magnetic transport mechanism in double ferromagnetic tunnel junctions with two-dimensional ferromagnetic particles 査読有り

    H Sukegawa, A Hirohata, S Nakamura, N Tezuka, S Sugimoto, K Inomata

    IEEE TRANSACTIONS ON MAGNETICS 41 (10) 2679-2681 2005年10月

    DOI: 10.1109/TMAG.2005.855292  

    ISSN:0018-9464

  184. Exchange coupling between FePt and Fe through Ru interlayer 査読有り

    JH Jiang, N Tezuka, K Inomata

    JOURNAL OF APPLIED PHYSICS 98 (6) 063902-1-063902-3 2005年9月

    DOI: 10.1063/1.2058189  

    ISSN:0021-8979

  185. Large tunnel magnetoresistance at room temperature with a Co2FeAl full-Heusler alloy electrode 査読有り

    S Okamura, A Miyazaki, S Sugimoto, N Tezuka, K Inomata

    APPLIED PHYSICS LETTERS 86 (23) 232503-1-232503-3 2005年6月

    DOI: 10.1063/1.1944893  

    ISSN:0003-6951

    eISSN:1077-3118

  186. Distinctive current-induced magnetization switching in a current-perpendicular-to-plane giant-magnetoresistance nanopillar with a synthetic antiferromagnet free layer 査読有り

    T Ochiai, Y Jiang, A Hirohata, N Tezuka, S Sugimoto, K Inomata

    APPLIED PHYSICS LETTERS 86 (24) 242506-1-242506-3 2005年6月

    DOI: 10.1063/1.1949709  

    ISSN:0003-6951

    eISSN:1077-3118

  187. Structural and magnetic properties of epitaxial L2(1)-structured Co-2(CrFe)Al films grown on GaAs(001) substrates 査読有り

    A Hirohata, H Kurebayashi, S Okamura, M Kikuchi, T Masaki, T Nozaki, N Tezuka, K Inomata

    JOURNAL OF APPLIED PHYSICS 97 (10) 103714-1-103714-8 2005年5月

    DOI: 10.1063/1.1888050  

    ISSN:0021-8979

    eISSN:1089-7550

  188. Spin transfer in antisymmetric exchange-biased spin-valves 査読有り

    Y Jiang, GH Yu, YB Wang, J Teng, T Ochiai, N Tezuka, K Inomata

    APPLIED PHYSICS LETTERS 86 (19) 192515-1-192515-3 2005年5月

    DOI: 10.1063/1.1927694  

    ISSN:0003-6951

  189. Structural and magnetic properties of epitaxial L2(1)-structured Co-2(CrFe)Al films grown on GaAs(001) substrates 査読有り

    A Hirohata, H Kurebayashi, S Okamura, M Kikuchi, T Masaki, T Nozaki, N Tezuka, K Inomata

    JOURNAL OF APPLIED PHYSICS 97 (10) 10C308-1-10C308-3 2005年5月

    DOI: 10.1063/1.1888050  

    ISSN:0021-8979

    eISSN:1089-7550

  190. CPP-GMR enhancement in spin valves using a thin Ru layer 査読有り

    N Tezuka, S Abe, Y Jiang, K Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 290 1150-1153 2005年4月

    DOI: 10.1016/j.jmmm.2004.11.499  

    ISSN:0304-8853

  191. Significant magnetoresistance enhancement due to a cotunneling process in a double tunnel junction with single discontinuous ferromagnetic layer insertion 査読有り

    H Sukegawa, S Nakamura, A Hirohata, N Tezuka, K Inomata

    PHYSICAL REVIEW LETTERS 94 (6) 068304-1-068304-4 2005年2月

    DOI: 10.1103/PhysRevLett.94.068304  

    ISSN:0031-9007

  192. Bias voltage effect on tunnel magnetoresistance in fully epitaxial MgO double-barrier magnetic tunnel junctions 査読有り

    T Nozaki, A Hirohata, N Tezuka, S Sugimoto, K Inomata

    APPLIED PHYSICS LETTERS 86 (8) 082501-1-082501-3 2005年2月

    DOI: 10.1063/1.1867559  

    ISSN:0003-6951

    eISSN:1077-3118

  193. A trial for fabricating a spin-filter operating at room temperature using a ferromagnetic insulator

    R. Goto, N. Tezuka, S. Sugimoto, K. Inomata

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 307 2005年

    出版者・発行元: IEEE Computer Society

    DOI: 10.1109/intmag.2005.1463735  

  194. Tunnel magnetoresistance in magnetic tunnel junctions with a disordered Co2(Cr1-xFex)Al full-Heusler alloy film

    S. Okamura, A. Miyazaki, N. Tezuka, S. Sugimoto, K. Inomata

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 993 2005年

  195. ホイスラー化合物の機能材料としての新展開 ホイスラー系ハーフメタル薄膜とそのTMR特性

    猪俣 浩一郎, 岡村 進, 手束 展規

    まてりあ 44 (8) 654-660 2005年

    出版者・発行元: The Japan Institute of Metals and Materials

    DOI: 10.2320/materia.44.654  

    ISSN:1340-2625

  196. L21構造を有するCo2Cr1-xFexAl薄膜の結晶構造と磁気特性 査読有り

    廣畑 貴文, 紅林 秀和, 岡村 進, 菊地 麻樹, 正木 達章, 野崎 隆行, 手束 展規, 猪俣 浩一郎

    日本応用磁気学会誌 29 (2) 124-127 2005年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.124  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    We successfully grew Co2Cr1-xFexAl full Heusler films (0 ≤ x ≤ 1) with the L21 structure onto GaAs(001) substrates by achieving stoichiometry in an ultrahigh-vacuum molecular beam epitaxy chamber. The films develop epitaxial crystallinity with the relationship of Co2Cr1-xFexAl(001)‹110›||GaAs(001)‹110›, which induces very strong uniaxial magnetocrystalline anisotropy, except for x = 0. For x = 1, in particular, the film is almost a single phase and its magnetic moment per formula unit exhibits Slater-Pauling behavior. Films of this type were used to fabricate magnetic tunnel junctions with 8.8% and 4.9% tunnel magnetoresistance (TMR) ratios at room temperature for x = 1 with an Al-O tunnel barrier and x = 0.6 with a MgO barrier, respectively. The TMR ratio can be further enhanced by both realizing an L21 single phase and eliminating lattice distortion.

  197. 強磁性ナノドット層を有する二重トンネル接合におけるTMRの増大 査読有り

    介川 裕章, 中村 新一, 廣畑 貴文, 手束 展規, 猪俣 浩一郎, 杉本 諭

    日本応用磁気学会誌 29 (3) 274-277 2005年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.274  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    We observed spin-dependent tunneling in Co90Fe10/AlOx/Co90Fe10/AlOx/Co90Fe10 ferromagnetic double tunnel junctions. A middle Co90Fe10 layer, which is inserted between two AlOx layers, is discontinuous due to the difference in the surface energy of these layers. The average diameter of Co90Fe10 particles was estimated to be 2.0-4.5 nm from cross-sectional transmission electron microscopy (TEM) images. At low temperature (< 50 K), a Coulomb gap is observed in current-voltage (I-V) curves, and the tunnel magnetoresistance (TMR) ratio within the gap enhances significantly with decreasing temperature, which indicates that the dominant electron transport is inelastic co-tunneling within the Coulomb gap. These observations in a ferromagnetic tunnel junction with 2-dimensional magnetic nano-particle layer insertion accord well with theoretical predictions by Takahashi and Maekawa [Phys. Rev. Lett. 80, 1758 (1998)].

  198. Co2CrGaフルホイスラー合金薄膜の結晶構造と磁気・電気伝導特性 査読有り

    菊地 麻樹, 正木 達章, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会誌 29 (4) 455-458 2005年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.29.455  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    We investigated the structural, magnetic and electrical transport properties of Co2CrGa full Heusler alloy films, and optimized the growth conditions, achieving stoichiometric films. The crystalline structures and the magnetic and electrical transport properties were found to depend on the film thickness, tCCG. An ordered L21 structure was obtained for tCCG≥100 nm. The saturation magnetization decreases with decreasing film thickness and vanishes below tCCG=23 nm, indicating the existence of a magnetically dead layer in the vicinity of the substrates. For tCCG=150 nm, the saturation magnetization is 602 emu/cm3 (3.1 μB) at 5 K, which agrees very well with the theoretical value. The resistivity of the samples with tCCG≤150 nm decreases with increasing temperature, while that with tCCG=300 nm increases. By using films with tCCG=100 nm and 300 nm as bottom electrodes, forming an L21 structure, magnetic tunnel junctions (MTJs) were also fabricated, showing 5.0% and 1.4% tunnel magnetoresistance (TMR) at RT, respectively.

  199. Structural, magnetic, and transport properties of full-Heusler alloy Co-2(Cr1-xFex)Al thin films 査読有り

    S Okamura, R Goto, S Sugimoto, N Tezuka, K Inomata

    JOURNAL OF APPLIED PHYSICS 96 (11) 6561-6564 2004年12月

    DOI: 10.1063/1.1810207  

    ISSN:0021-8979

  200. Spin-dependent quantum oscillations in magnetic tunnel junctions with Ru quantum wells 査読有り

    T. Nozaki, Y. Jiang, Y. Kaneko, A. Hirohata, N. Tezuka, S. Sugimoto, K. Inomata

    Physical Review B - Condensed Matter and Materials Physics 70 (17) 1-4 2004年11月

    DOI: 10.1103/PhysRevB.70.172401  

    ISSN:0163-1829

  201. Tunnel magneto resistance using full-Heusler alloys 査読有り

    K Inomata, S Okamura, N Tezuka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 282 269-274 2004年11月

    DOI: 10.1016/j.jmmm.2004.04.063  

    ISSN:0304-8853

    eISSN:1873-4766

  202. Spin-dependent quantum oscillations in magnetic tunnel junctions with Ru quantum wells 査読有り

    T Nozaki, Y Jiang, Y Kaneko, A Hirohata, N Tezuka, S Sugimoto, K Inomata

    PHYSICAL REVIEW B 70 (17) 172401-172401 2004年11月

    DOI: 10.1103/PhysRevB.70.172401  

    ISSN:1098-0121

  203. Effect of the soft/hard exchange interaction on natural resonance frequency and electromagnetic wave absorption of the rare earth-iron-boron compounds 査読有り

    T Maeda, S Sugimoto, T Kagotani, N Tezuka, K Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 281 (2-3) 195-205 2004年10月

    DOI: 10.1016/j.jmmm.2004.04.105  

    ISSN:0304-8853

  204. Influence of synthetic antiferromagnet free layer on current-perpendicular-to-plane spin-valves 査読有り

    Y Jiang, S Abe, T Nozaki, N Tezuka, K Inomata

    IEEE TRANSACTIONS ON MAGNETICS 40 (4) 2245-2247 2004年7月

    DOI: 10.1109/TMAG.2004.830231  

    ISSN:0018-9464

  205. Magnetoresistance in tunnel junctions using Co-2(Cr,Fe)Al full Heusler alloys 査読有り

    K Inomata, N Tezuka, S Okamura, H Kurebayashi, A Hirohata

    JOURNAL OF APPLIED PHYSICS 95 (11) 7234-7236 2004年6月

    DOI: 10.1063/1.1651813  

    ISSN:0021-8979

    eISSN:1089-7550

  206. Substantial reduction of critical current for magnetization switching in an exchange-biased spin valve 査読有り

    Y Jiang, T Nozaki, S Abe, T Ochiai, A Hirohata, N Tezuka, K Inomata

    NATURE MATERIALS 3 (6) 361-364 2004年6月

    DOI: 10.1038/nmat1120  

    ISSN:1476-1122

    eISSN:1476-4660

  207. Magnetic domain structures and switching properties in submicron size synthetic antiferromagnets 査読有り

    N. Tezuka, N. Koike, K. Sakurada, K. Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 272 E1289-E1291 2004年5月

    DOI: 10.1016/j.jmmm.2003.12.403  

    ISSN:0304-8853

  208. Magnetic switching properties of magnetic tunnel junctions using a synthetic ferrimagnet free layer 査読有り

    T Nozaki, Y Jiang, H Sukegawa, N Tezuka, A Hirohata, K Inomata, S Sugimoto

    JOURNAL OF APPLIED PHYSICS 95 (7) 3745-3748 2004年4月

    DOI: 10.1063/1.1669053  

    ISSN:0021-8979

  209. Effective reduction of critical current for current-induced magnetization switching by a Ru layer insertion in an exchange-biased spin valve 査読有り

    Y Jiang, S Abe, T Ochiai, T Nozaki, A Hirohata, N Tezuka, K Inomata

    PHYSICAL REVIEW LETTERS 92 (16) 167204-1-167204-4 2004年4月

    DOI: 10.1103/PhysRevLett.92.167204  

    ISSN:0031-9007

  210. Magnetoresistance of magnetic double tunnel junctions 査読有り

    H Sukegawa, N Tezuka, K Inomata, S Sugimoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 68 (2) 74-77 2004年2月

    ISSN:0021-4876

    eISSN:1880-6880

  211. Magnetoresistance of magnetic tunnel junctions with Zn0.4Fe2.6O4 thin films 査読有り

    K Nishimura, N Tezuka, S Sugimoto, K Inomata

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 68 (2) 82-85 2004年2月

    ISSN:0021-4876

    eISSN:1880-6880

  212. Co2Cr1-xFexAlフルホイスラー合金の構造と磁気・伝導特性 査読有り

    岡村進, 後藤龍太, 手束展規, 杉本諭, 猪俣浩一郎

    日本金属学会誌 68 (2) 114-117 2004年2月

    DOI: 10.2320/jinstmet.68.114  

    ISSN:0021-4876

    eISSN:1880-6880

  213. Zn0.4Fe2.6O4薄膜を用いた強磁性トンネル接合の磁気抵抗効果 査読有り

    西村和正, 手束展規, 杉本諭, 猪俣浩一郎

    日本金属学会誌 68 (2) 82-85 2004年

    出版者・発行元:

    DOI: 10.2320/jinstmet.68.82  

    ISSN:0021-4876

  214. スピン二重トンネル接合の磁気抵抗効果 査読有り

    介川裕章, 手束展規, 猪俣浩一郎, 杉本諭

    日本金属学会誌 68 (2) 74-77 2004年

    出版者・発行元:

    DOI: 10.2320/jinstmet.68.74  

    ISSN:0021-4876

  215. Co2(Cr1-xFex)Alフルホイスラー合金を用いたMTJの磁気抵抗効果 査読有り

    岡村 進, 後藤龍太, 手束展規, 杉本 諭, 猪俣浩一郎

    日本応用磁気学会誌 28 (2) 172-175 2004年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.28.172  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    Co2CrAl (x = 0) films were found to form a B2 structure, and when Fe was substituted for Cr (x = 0.4−0.6), the films crystallized B2+A2 structures, while an A2 structure was stable in the case of Co2FeAl (x = 1) films deposited on thermally oxidized Si substrates at room temperature. The magnetic moments of the films containing Fe tended to increase with increasing x, while those of the films containing Cr were far from the values calculated with an assumption of the L21 structure ordering.<BR>Spin-valve-type tunneling junctions with a Co2(Cr1-xFex) Al film were also fabricated, which demonstrated large tunneling magnetoresistance of 19.1% (x= 0.4) at room temperature and 27.2% at 5 K in spite of atomic site disorder.

  216. 極薄Ruキャップ層を用いたスピンバルブ素子のCPP-GMR特性 査読有り

    阿部 慎也, 山口 正彦, 手束 展規, 猪俣 浩一郎

    日本応用磁気学会誌 28 (9) 987-990 2004年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.28.987  

    ISSN:0285-0192

    詳細を見る 詳細を閉じる

    We have studied the current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) of single spin-valve (SV) films with two different free layers : one is a single ferromagnet layer (conventional), and the other is a ferromagnetic layer with a ruthenium cap layer (Ru cap). When the spacer Cu layer thickness is 2.5 nm and the Ru layer is 0.45 nm, the Ru cap-type greatly enhances the CPP-GMR, with increasing its value up to 4.3%. We argue that the MR enhancement is probably caused by the spin-dependent scattering due to the strong reflection of majority spins at the Co90Fe10/Ru interface.

  217. Enhanced Current-perpendicular-to-plane Giant Magnetoresistance in Single Spin-valve with Synthetic Antiferromagnet Free Layers 査読有り

    Y. Jiang, S. Abe, T. Nozaki, N. Tezuka, K. Inomata

    Transactions of the Materials Research Society of Japan 29 1531-1533 2004年

  218. Perpendicular giant magnetoresistance and magnetic switching properties of a single spin valve with a synthetic antiferromagnet as a free layer 査読有り

    Y Jiang, S Abe, T Nozaki, N Tezuka, K Inomata

    PHYSICAL REVIEW B 68 (22) 224426-1-224426-7 2003年12月

    DOI: 10.1103/PhysRevB.68.224426  

    ISSN:1098-0121

  219. Enhancement of current-perpendicular-to-plane giant magnetoresistance by synthetic antiferromagnet free layers in single spin-valve films 査読有り

    Y Jiang, S Abe, T Nozaki, N Tezuka, K Inomata

    APPLIED PHYSICS LETTERS 83 (14) 2874-2876 2003年10月

    DOI: 10.1063/1.1616974  

    ISSN:0003-6951

  220. Improved thermal stability of ferromagnetic tunnel junctions with a CoFe/CoFeOX/CoFe pinned layer 査読有り

    T Ochiai, N Tezuka, K Inomata, S Sugimoto, Y Saito

    IEEE TRANSACTIONS ON MAGNETICS 39 (5) 2797-2799 2003年9月

    DOI: 10.1109/TMAG.2003.815715  

    ISSN:0018-9464

  221. Magnetization reversal and domain structure of antiferromagnetically coupled submicron elements 査読有り

    N Tezuka, N Koike, K Inomata, S Sugimoto

    JOURNAL OF APPLIED PHYSICS 93 (10) 7441-7443 2003年5月

    DOI: 10.1063/1.1539074  

    ISSN:0021-8979

  222. Size-independent spin switching field using synthetic antiferromagnets 査読有り

    K Inomata, N Koike, T Nozaki, S Abe, N Tezuka

    APPLIED PHYSICS LETTERS 82 (16) 2667-2669 2003年4月

    DOI: 10.1063/1.1568823  

    ISSN:0003-6951

  223. Large tunneling magnetoresistance at room temperature using a Heusler alloy with the B2 structure 査読有り

    K Inomata, S Okamura, R Goto, N Tezuka

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 42 (4B) L419-L422 2003年4月

    DOI: 10.1143/JJAP.42.L419  

    ISSN:0021-4922

  224. 永久磁石材料を用いた電磁波吸収体

    杉本 諭, 前田 徹, 籠谷登志夫, 手束展規, 猪俣浩一郎

    まてりあ 42 (3) 202-205 2003年2月

    DOI: 10.2320/materia.42.202  

  225. Perpendicular giant magnetoresistance and magnetic switching properties of a single spin valve with a synthetic antiferromagnet as a free layer 査読有り

    Y. Jiang, S. Abe, T. Nozaki, N. Tezuka, K. Inomata

    Physical Review B - Condensed Matter and Materials Physics 68 (22) 2244261-2244267 2003年

    DOI: 10.1103/PhysRevB.68.224426  

    ISSN:0163-1829

  226. (Y1-xSmx)2Fe14B化合物の自然共鳴と電磁波吸収 査読有り

    前田 徹, 手束展規, 籠谷登志夫, 杉本 諭, 猪俣浩一郎

    粉体および粉末冶金 50 (1) 63-67 2003年1月

    DOI: 10.2497/jjspm.50.63  

  227. ZnxFe3-xO4薄膜の構造および磁気・電気特性 査読有り

    西村和正, 手束展規, 猪俣浩一郎, 杉本諭

    日本応用磁気学会誌 27 (4) 340-343 2003年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.340  

    ISSN:0285-0192

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    The structural, magnetic, and electrical properties of sputtered ZnxFe3-xO4 thin films were investigated. A spinel structure was obtained for samples annealed above 673 K. The magnetization at 10 kOe of a sample sputtered in Ar and annealed at 873 K was 450 emu/cm3. Magnetization decreased in samples annealed above 873 K, as a result of evaporation of Zn and an increase in the thickness of the insulating layer. A MR ratio of about 4.3 % was observed at T = 300 K in a sample sputtered in Ar and O2 mixed gas, and MR curve was of a granular type. However, because the Zn was completely evaporated at this sample, the MR was associated with the Fe3O4 grains and the α-Fe2O3 boundary.

  228. 微細反平行結合素子の磁化状態とスピン反転磁場 査読有り

    小池伸幸, 手束展規, 猪俣浩一郎, 杉本諭

    日本応用磁気学会誌 27 (4) 316-319 2003年

    出版者・発行元: 公益社団法人 日本磁気学会

    DOI: 10.3379/jmsjmag.27.316  

    ISSN:0285-0192

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    Arrays of synthetic antiferromagnetic (SyAF) patterned elements were successfully fabricated with micron to submicron sizes. Their magnetic domain structures and spin-switching fields were investigated by using magnetic force microscopy (MFM) and the magnetic optical Kerr effect (MOKE), respectively. A single-domain structure was observed in Co9Fe/Ru/Co9Fe SyAF bits for even a small aspect ratio of 1, while Co9Fe monolayer bits showed a multi-domain structure for aspect ratios below 2. The spin-switching field of Co9Fe (6 nm)/Ru (0.45 nm)/Co9Fe (10 nm) SyAF exhibited independence of element size, while that of Co9Fe (10 nm) single elements was strongly dependent on element size. These results indicate the predominance of SyAF for ultrahigh-bit-density MRAM devices.

  229. ピン層にCoFe/CoFeOx/CoFeを用いた強磁性トンネル接合の耐熱性の改善 査読有り

    落合隆夫, 手束展規, 猪俣浩一郎, 杉本諭, 斉藤好昭

    日本応用磁気学会誌 27 (4) 307-310 2003年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.27.307  

    ISSN:0285-0192

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    The annealing temperature dependence of the tunnel magnetoresistance (TMR) ratio for ferromagnetic tunnel junctions with CoFeOx inserted in the pinned layer was investigated. A junction with a CoFe/CoFeOx/CoFe as the pinned layer exhibited TMR ratios of 47 % and 43 % after annealing at 350°C and at 375°C respectively, The reason for the improvement of the thermal stability is related to oxygen diffusion from CoFeOx layer, and there is a possibility that CoFeOx plays a role of Mn (in MnIr exchange layer) diffusion barrier.

  230. Single domain observation for synthetic antiferromagnetically coupled bits with low aspect ratios 査読有り

    N Tezuka, N Koike, K Inomata, S Sugimoto

    APPLIED PHYSICS LETTERS 82 (4) 604-606 2003年1月

    DOI: 10.1063/1.1539549  

    ISSN:0003-6951

  231. Co2MnGeホイスラー合金薄膜の構造と磁気特性 査読有り

    岡村進, 手束展規, 猪俣浩一郎, 杉本諭, 村上義弘, 斉藤今朝美, 三谷誠司, 高梨弘毅

    日本応用磁気学会誌 26 (4) 437-440 2002年12月31日

    DOI: 10.3379/jmsjmag.26.437  

  232. Magnetic switching properties of GMR spin-valves using SyAF free layers 査読有り

    T Nozaki, S Abe, N Tezuka, K Inomata, S Sugimoto

    JOURNAL OF THE JAPAN INSTITUTE OF METALS 66 (11) 1078-1082 2002年11月

    ISSN:0021-4876

    eISSN:1880-6880

  233. Natural resonance phenomenon and GHz range microwave absorption of (Nd1-xSmx)2Fe14B resin composites

    TORU MAEDA, SATOSHI SUGIMOTO, NOBUKI TEZUKA, TOSHIO KAGOTANI, KOICHIRO INOMATA

    PROCEEDINGS OF THE SEVENTEETH INTERNATIONAL WORKSHOP ON Rare Earth Magnets and Their Applications, Edited by G.C. Hadjipanisis and M.J.Bonder, Rinton Press, USA 592-599 2002年8月

  234. Magnetic switching field and giant magnetoresistance effect of multilayers with synthetic antiferromagnet free layers 査読有り

    K Inomata, T Nozaki, N Tezuka, S Sugimoto

    APPLIED PHYSICS LETTERS 81 (2) 310-312 2002年7月

    DOI: 10.1063/1.1490149  

    ISSN:0003-6951

  235. A thermodynamic study of the HDDR conditions in the Sm2Fe17Nx compound 査読有り

    S Ohga, S Sugimoto, N Tezuka, T Kagotani, K Inomata

    MATERIALS TRANSACTIONS 43 (3) 459-461 2002年3月

    DOI: 10.2320/matertrans.43.459  

    ISSN:1345-9678

    eISSN:1347-5320

  236. Magnetic properties and microwave absorption properties of polymer-protected cobalt nanoparticles 査読有り

    Y Kato, S Sugimoto, K Shinohara, N Tezuka, T Kagotani, K Inomata

    MATERIALS TRANSACTIONS 43 (3) 406-409 2002年3月

    DOI: 10.2320/matertrans.43.406  

    ISSN:1345-9678

    eISSN:1347-5320

  237. Magnetic properties of the Cr(001) surface studied by spin-polarized scanning tunneling spectroscopy 査読有り

    M Kleiber, M Bode, R Ravlic, N Tezuka, R Wiesendanger

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 240 (1-3) 64-69 2002年2月

    ISSN:0304-8853

  238. Improvement of coercivity of anisotropic Nd-Fe-BHDDR powders by Ga addition 査読有り

    S Sugimoto, H Murai, N Koike, H Nakamura, D Book, N Tezuka, T Kagotani, M Okada, M Homma, K Inomata

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 239 (1-3) 444-446 2002年2月

    DOI: 10.1016/S0304-8853(01)00620-5  

    ISSN:0304-8853

  239. Switching field behavior in antiparallely coupled sub-micrometer scale magnetic elements 査読有り

    N Tezuka, E Kitagawa, K Inomata, S Sugimoto, N Kikuchi, Y Shimada

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 240 (1-3) 294-296 2002年2月

    DOI: 10.1016/S0304-8853(01)00782-X  

    ISSN:0304-8853

  240. サブミクロン反平行結合膜のスピン反転挙動

    北川 英二, 野崎 隆行, 手束 展規, 猪俣 浩一郎, 杉本 諭, 渡辺 雅人, 藤森 啓安, 増本 健

    日本応用磁気学会誌 26 (4) 422-425 2002年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.26.422  

    ISSN:0285-0192

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    Magnetization reversal of patterned magnetic structures consisting of single and antiferromagnetically (AF) coupled magnetic elements was simulated by Landau-Lifshitz-Gilbert equations. It is considered that AF coupled magnetic elements can make the demagnetization field small. Simulation was carried out for changing saturation magnetization, uniaxial anisotropy, magnetic exchange stiffness constant, interlayer exchange coupling, magnetic layer thickness, nonmagnetic layer thickness and element size. As a result, we found that the switching field of AF coupled magnetic elements became smaller than that of single magnetic elements in submicron elements.

  241. Magnetization reversal of deep submicron magnetic elements 査読有り

    N. Tezuka, E. Kitagawa, K. Inomata, S. Sugimoto

    INTERMAG Europe 2002 - IEEE International Magnetics Conference 2002年

    出版者・発行元: Institute of Electrical and Electronics Engineers Inc.

    DOI: 10.1109/INTMAG.2002.1001209  

  242. 永久磁石材料のGHz帯電磁波吸収体への応用

    杉本 諭, 前田 徹, 籠谷登志夫, 手束展規, 猪俣浩一郎

    電気学会 マグネティックス研究会資料 MAG-02-164 51-56 2002年

  243. 反平行結合フリー層を用いたGMRスピンバルブ膜の磁化反転特性 査読有り

    野崎隆行, 阿部慎也, 手束展規, 猪俣浩一郎, 杉本諭

    日本金属学会誌 66 (11) 1078-1082 2002年

    出版者・発行元:

    DOI: 10.2320/jinstmet1952.66.11_1078  

    ISSN:0021-4876

  244. Effect of Co Addition on the GHz Range Microwave Absorption Properties of the Disproportionated Mixture formed from the Sm2Fe17 Compound 査読有り

    Toru Maeda, Satoshi Sugimoto, Nobuki Tezuka, Toshio Kagotani, Koichiro Inomata

    Proceeding of The Foourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), Ed. by S. Hanada, Z. Zhong, S. W. Nam and R. N. Wright, The Japan Institute of Metals, 2001 2817-2820 2001年12月

  245. Effect of Substitution Composition on the Electromagnetic Absorption Properties in Aligned M-type Barium Ferrite Ba1-xLaxZnxFe12-x-y(Me0.5Mn0.5)yO19 (x=0.0-0.5, Me:,Sn 査読有り

    Toshio Kagotani, Daisuke Fujiwara, Hiroyuki Takabayashi, Nobuki Tezuka, Satoshi Sugimoto, Koichiro Inomata, Motofumi Homma

    Proceedings of The Fourth Pacific Rim International Conference on Advanced Materials and Processing (PRICM4), Ed. by S. Hanada, Z. Zhong, S. W. Nam and R. N. Wright, The Japan Institute of Metals 2821-2824 2001年12月

  246. Thickness and Oxidation Time Dependence of Tunnel Magnetoresistance in Ni-Fe/Co/Al-O/Co Junctions 査読有り

    H. Kubota, S. Otsuka, M. Kamijo, N. Tezuka, Y. Ando, C.C. Yu, T. Miyazaki

    Journal of the Magnetics Society of Japan 24 (4) 595-598 2000年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.24.595  

    ISSN:0285-0192

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    Ni-Fe/Co/Al-O/Co tunnel junctions with small active areas down to 3 x 3 μm2 were fabricated by the micro-fabrication technique. The Al-O insulating layer was prepared by plasma oxidation of a thin sputtered Al film. The dependences of the tunnel magnetoresistance on the thickness of the Al film and the oxidation time were investigated. The interface structure of the junction was observed by using high-resolution electron microscopy. The relationship between the magnetoresistive properties and the interface structure is discussed.

  247. Characterization of the Barrier Layer in Al1-xCox/{ Al1-xCox -Oxide}/Al Tunnel Junctions 査読有り

    X.F. Han, J. Murai, M. Hayashi, N. Tezuka, Y. Ando, T. Miyazaki

    Journal of the Magnetics Society of Japan 24 (4) 603-606 2000年

    出版者・発行元: 公益社団法人 日本磁気学会

    DOI: 10.3379/jmsjmag.24.603  

    ISSN:0285-0192

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    Oxides of Al1-xCox (x = 0, 0.25, 0.50, 0.75, and 1.0) alloys were chosen as barrier materials in this work. The tunnel junctions consisted of a bottom electrode Al1-xCox and a top electrode Al with an insulating layer {Al1-xCox-oxide} formed by natural oxidation in a baking-box at 333 K. The oxidation time for forming an Al1-xCox-oxide layer on the surface of the bottom Al1-xCox layers was optimized. When tunnel resistances were between 105 and 107 &Omega;&mu;m2 measured at 1 mV and at 4.2 K, the effective barrier height and width of the insulating layers of Al1-xCox-oxide (x = 0.25, 0.5, and 0.75) varied between 0.7 and 2.2 eV and between 1.4 and 1.7 nm, respectively. It is shown that the thin oxide layer of Al1-xCox alloys can be used as a barrier.

  248. Ni80Fe20/Co/N(N=Ta,Cu,Al)/Al-oxide/Co接合における磁気抵抗効果 査読有り

    大坊忠臣, 手束展規, 久保田均, 安藤康夫, 林将光, 宮崎照宣, Changkyung Kim, Ohsung Song

    日本応用磁気学会誌 24 (4) 599-602 2000年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.24.599  

    ISSN:0285-0192

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    The effect on the tunneling magnetoresistance (TMR) of inserting the nonmagnetic metals (NMs) Al, Cu, and Ta between the insulator and ferromagnetic layer of a tunnel junctions was investigated. The TMR ratio for a junction with Ta decreased rapidly with increasing Ta thickness, while that for a junction with Al remained more than 50 Å of the thickness. From cross-sectional TEM and AFM measurement, it was found that a junction with thick Al has an insulating layer on both sides of the metallic Al; that is, it would be a double-barrier tunnel junction. We compared the experimental result for the metallic Al thickness dependence of the TMR ratio with the theory of double tunnel junctions. Consequently, the spin diffusion length of Al was estimated to be sub-micrometer.

  249. Applied voltage and temperature dependence of tunneling magnetoresistance 査読有り

    N Tezuka, M Oogane, T Miyazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 198-99 149-151 1999年6月

    DOI: 10.1016/S0304-8853(98)01056-7  

    ISSN:0304-8853

  250. Influence of interlayer roughness on magnetoresistive effect of ferromagnetic tunneling junctions 査読有り

    Y Ando, M Yokota, N Tezuka, T Miyazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 198-99 155-157 1999年6月

    DOI: 10.1016/S0304-8853(98)01053-1  

    ISSN:0304-8853

  251. Analysis of the interface in ferromagnet/insulator junctions by inelastic-electron-tunneling-spectroscopy 査読有り

    Y. Ando, J. Murai, N. Tezuka, T. Miyazaki

    J. Magn. Magn. Mater. 198-199 161-163 1999年

    DOI: 10.1016/S0304-8853(98)01050-6  

  252. Arイオンミリングによる強磁性トンネル接合の微細加工 査読有り

    大塚茂樹, 上條誠, 手束展規, 久保田均, 宮崎照宣

    日本応用磁気学会誌 23 (4) 1305-1308 1999年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.23.1305  

    ISSN:0285-0192

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    The effect of the Ar ion milling process on tunnel magneto-resistance was investigated by using Ar ion milling to make a small hole at the center of the active area of a junction prepared by means of metal masks. Metallic short-circuiting through the material redeposited during Ar ion milling was evaluated by comparing the tunnel resistance before and after the process. The amount of redeposited material was small in the samples produced by the milling process with a higher incident angle of Ar ions. Small Ni-Fe/Co/Al-O/Co junctions with various active area ranged from 9 to 104 μm2 were also fabricated. The tunnel resistance increased in inverse proportion to the active area. Many junctions showed a TMR ratio of 9%-13%, which was as large as the value for junctions prepared by means of metal masks.

  253. 強磁性体/Al-Oxide/Co接合のトンネル磁気抵抗効果の印加電圧及び温度依存性 査読有り

    大兼幹彦, 手束展規, 宮崎照宣

    日本応用磁気学会誌 23 (4) 1297-1300 1999年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.23.1297  

    ISSN:0285-0192

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    Ferromagnetic tunneling junctions with various thicknesses of the first ferromagnetic layer were fabricated. Co and Ni80Fe20 were used as the first ferromagnetic layer, and their thicknesses were varied between 10 and 200 Å. The voltage and temperature dependence of the tunneling magnetoresistance (TMR) ratio and conductance characteristic were investigated for these junctions. A drastic decrease in the conductance near the zero bias in the conductance-voltage characteristics (zero-bias anomaly) was observed in some junctions. A rapid decrease in the TMR ratio below 5 mV and 50 K was also observed in the same junctions. A slight decrease in the TMR ratio above 10 mV and 100 K was observed in all junctions. We investigated the origin of the voltage and temperature dependence of the TMR ratio by taking account of the magnetic impurity and magnon effect.

  254. Ni80Fe20/Al-Oxide/Co接合におけるトンネル磁気抵抗比のNi80Fe20膜厚依存性 査読有り

    大兼幹彦, 手束展規, 宮崎照宣

    日本応用磁気学会誌 23 (4) 1309-1312 1999年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.23.1309  

    ISSN:0285-0192

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    Ferromagnetic tunneling junctions with various thicknesses of the first ferromagnetic layer were fabricated. Ni80Fe20 and Co were used as the first ferro-magnetic layer, and their thicknesses were varied between 10 and 200 Å. The tunneling magnetoresistance (TMR) ratio decreased and the shape of the TMR curve changed with decreasing Ni80Fe20 thickness, but changed only slightly with decreasing Co thickness. We calculated the TMR and magnetization curves by using a simple model that takes account of magnetic anisotropy to explain the change in the TMR ratio and the shape of the TMR curve with changing Ni80Fe20 thickness.

  255. Ni80Fe20/Al-oxide/Co接合における磁気抵抗効果のAl-oxide厚依存性 査読有り

    手束展規, 宮崎照宣

    日本応用磁気学会誌 23 (4) 1317-1320 1999年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.23.1317  

    ISSN:0285-0192

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    Ferromagnetic tunneling junctions of Ni80Fe20/Al oxide/Co with various Ni80Fe20 and Al-oxide thicknesses were fabricated by magnetron sputtering using metal masks. The thicknesses of Ni80Fe20 were 70, 100, 200, 500, and 1000 Å. The thicknesses of the Al layer ranged from 7 to 80 Å, and the Al oxide films were formed by natural oxidization. The thicker the Ni80Fe20 layer, the larger the optimum Al thickness for the TMR ratio. On the other hand, when the thickness of Ni80Fe20 was constant, the TMR ratio decreased with increasing Al thickness. To clarify the reason for this, AFM images of the Ni80Fe20 surface were measured. The surface roughness of Ni80Fe20 increased with increasing Ni80Fe20 thickness.

  256. Spin-polarized magnetic tunnelling magnetoresistive effects in various junctions 査読有り

    T Miyazaki, N Tezuka, S Kumagai, Y Ando, H Kubota, J Murai, T Watabe, M Yokota

    JOURNAL OF PHYSICS D-APPLIED PHYSICS 31 (6) 630-636 1998年3月

    DOI: 10.1088/0022-3727/31/6/009  

    ISSN:0022-3727

  257. Temperature and applied voltage dependence of magnetoresistance ratio in Fe Al oxide Fe junctions 査読有り

    N Tezuka, T Miyazaki

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS 37 (2B) L218-L220 1998年2月

    DOI: 10.1143/JJAP.37.L218  

  258. Barrier height dependence of MR ratio in Fe/Al-oxide/Fe junctions 査読有り

    N Tezuka, T Miyazaki

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 177 1283-1284 1998年1月

    DOI: 10.1016/S0304-8853(97)00964-5  

    ISSN:0304-8853

  259. ウェッジ状のAl-O絶縁層を有する強磁性トンネル接合の磁気抵抗効果 査読有り

    横田匡史, 安藤康夫, 手束展規, 宮崎照宣

    日本応用磁気学会誌 22 (4) 569-572 1998年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.22.569  

    ISSN:0285-0192

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    Ferromagnetic tunneling junctions of Ni80Fe20 (Py)/Co/Al oxide/Co with wedge-shaped insulators were fabricated. Al oxide films were formed by natural oxidization with various conditions and were checked by FT-IR spectroscopy. The peak intensity and the position depending on the Al thickness were explained by using the 1-D Einstein model. When the oxidization time was less than 50 h, tunneling magnetoresistance (TMR) was observed at about 13 Å of the Al thickness. When the oxidization time became more than 50 h, the thickness shifted to less than 10 Å. The reason for this was considered that Co oxide was formed on the surface of the bottom electrode and became a tunneling barrier with increasing oxidization time. On the other hand, the TMR decreased rapidly with increasing Al thickness. To determine the reason for this, AFM images of the Py/Co/Al surface with various oxidization times were measured. The surface roughness of the Al increased with increasing oxidization time, corresponding to the TMR results.

  260. 非弾性電子トンネル分光法(IETS)を用いた強磁性体/絶縁体界面の解析 査読有り

    村井純一郎, 安藤康夫, 手束展規, 宮崎照宣

    日本応用磁気学会誌 22 (4) 573-576 1998年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.22.573  

    ISSN:0285-0192

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    Inelastic electron-tunneling spectroscopy (IETS) has been used to investigate the vibrational spectrum in Al/Al2O3/CO/AI tunneling junctions with various Co thicknesses (d Co). A zero-bias anomaly was observed in the conductance curve of the junction with dCo of 2Å, and decreased with increasing dCo. The IET spectra of these junctions showed strong negative peaks at 4 mV, corresponding to the zero-bias anomaly, while phonon spectra were observed for the junction with dCo ≥ 10Å. The peak position was different from that of Al/Al2O3/Al. After annealing of the junction with dCo of 2Å at 250°C for one hour, the zero-bias anomaly decreased and the phonon spectrum appeared.

  261. NiFe/Co/Al2O3/Co/NiFe/FeMn接合のトンネル磁気抵抗効果 査読有り

    熊谷静似, 手束展規, 宮崎照宣

    日本応用磁気学会誌 22 (4) 561-564 1998年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.22.561  

    ISSN:0285-0192

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    Spin-valve-type ferromagnetic tunneling junctions using contact metal masks were fabricated, and the annealing effect and temperature dependence of the tunneling magnetoresistance (TMR) ratio and saturated resistance (Rs) were investigated. As-prepared NiFe/Co/Al2O3/Co/NiFe/FeMn junctions showed a spin-valve-like MR curve at room temperature. The effect of field annealing was investigated for two reasons: to increase the TMR ratio and: to create an orthogonal magnetic orientation in each of the two magnetic layers. The temperature dependence of the TMR ratio and Rs is affected by the annealing. For the annealed junction, the TMR ratio decreases slightly with increasing temperature and decreases rapidly around 418 K, because of the disappearance of the exchange bias in the FeMn layer.

  262. Temperature dependence of the spin tunneling magnetoresistive effect on NiFe/Co/Al2O3/Co/NiFe/FeMn junctions 査読有り

    S Kumagai, N Tezuka, T Miyazaki

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS 36 (11B) L1498-L1500 1997年11月

    DOI: 10.1143/JJAP.36.L1498  

    ISSN:0021-4922

  263. Spin-polarized tunneling magnetoresistive effect in ferromagnet/insulator/ferromagnet junctions 査読有り

    T Miyazaki, N Tezuka, S Kumagai

    PHYSICA B 237 256-260 1997年7月

    DOI: 10.1016/S0921-4526(97)00152-X  

    ISSN:0921-4526

  264. 強磁性トンネル接合における絶縁障壁と磁気抵抗 査読有り

    手束展規, 安藤康夫, 宮崎照宣, H.G. Tompkins, S. Tehrani, H. Goronkin

    日本応用磁気学会誌 21 (4) 493-496 1997年

    出版者・発行元: The Magnetics Society of Japan

    DOI: 10.3379/jmsjmag.21.493  

    ISSN:0285-0192

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    The dependence of the tunneling magnetoresistive effect on the barrier height was investigated. The magnitude of the barrier height increased with increasing aluminum oxidation temperature and time from 0.3 to 2.3 eV in Fe/Al oxide/Fe junctions. However, those values are smaller than those reported for an Al2O3 barrier. A possible reason for this is that the barrier is not pure Al2O3, but AIOx, or another oxide created by interface mixing between Fe and Al oxide. On the other hand, the magnetoresistance ratio in these junctions varied up to 18% at room temperature and up to 18% at 4.2 K. The dependence of the magnetoresistance ratio at 4.2 K on the barrier height is roughly the same as predicted by Slonczewski's theory. This result shows that the effective spin polarization of ferromagnetic electrodes changes according to the barrier height.

  265. Magnetic tunneling effect in Fe/Al2O3/Ni1-xFex junctions 査読有り

    N Tezuka, T Miyazaki

    JOURNAL OF APPLIED PHYSICS 79 (8) 6262-6264 1996年4月

    DOI: 10.1063/1.362028  

    ISSN:0021-8979

  266. Spin polarized tunneling in ferromagnet insulator ferromagnet junctions 査読有り

    T Miyazaki, N Tezuka

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 151 (3) 403-410 1995年12月

    DOI: 10.1016/0304-8853(95)00563-3  

    ISSN:0304-8853

  267. GIANT MAGNETIC TUNNELING EFFECT IN FE/AL2O3/FE JUNCTION 査読有り

    T MIYAZAKI, N TEZUKA

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 139 (3) L231-L234 1995年1月

    DOI: 10.1016/0304-8853(95)90001-2  

    ISSN:0304-8853

  268. 強磁性/Al2O3/強磁性接合の磁気トンネリング効果 査読有り

    手束展規, 安藤康夫, 宮崎照宣

    日本応用磁気学会誌 19 369-372 1995年

    DOI: 10.3379/jmsjmag.19.369  

  269. Fe,Ni,Co金属の結晶粒径と保磁力 査読有り

    佐藤文隆, 手束展規, 桜井伴明, 宮崎照宣

    日本応用磁気学会誌 17 886-891 1993年

    DOI: 10.3379/jmsjmag.17.886  

︎全件表示 ︎最初の5件までを表示

MISC 54

  1. 還元拡散法により表面修飾したSm-Fe-N系粉末のSm-rich相と磁気特性

    松浦昌志, 松田瑠香, 手束展規, 杉本諭, 杉本諭, 石川尚, 米山幸伸

    電気学会論文誌 A 142 (7) 2022年

    ISSN: 0385-4205

  2. Nd-Fe-B/Nd薄膜における酸化状態と保磁力

    松浦 昌志, 深田 東吾, 後藤 龍太, 手束 展規, 杉本 諭

    電気学会研究会資料. MAG, マグネティックス研究会 2009 (60) 59-63 2009年8月5日

  3. Co基フルホイスラー合金を用いた強磁性トンネル接合の磁気抵抗効果

    手束 展規, 池田 直路, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会研究会資料 153 1-6 2007年2月27日

    ISSN: 1340-7562

  4. Co/Pt多層膜単一ナノドットの磁化過程

    加藤 貴裕, 菊池 伸明, 岡本 聡, 北上 修, 手束 展規, 杉本 諭

    電気学会研究会資料. MC, 金属・セラミックス研究会 2006 (1) 5-9 2006年11月28日

  5. Heusler alloy/semiconductor hybrid structures

    A. Hirohata, A. Kikuchi, N. Tezuka, K. Inomata, J. S. Claydon, Y. B. Xu, G. van der Laan

    CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE 10 (2) 93-107 2006年4月

    DOI: 10.1016/j.cossms.2006.11.006  

    ISSN: 1359-0286

    eISSN: 1879-0348

  6. Tunnel magnetoresistance enhancement in ferromagnetic tunnel junctions with ferromagnetic nano-particle layer insertion

    H. Sukegawa, S. Nakamura, A. Hirohata, N. Tezuka, N. Tezuka, S. Sugimoto, K. Inomata, K. Inomata

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 1002 2005年12月12日

  7. Substantial reduction of critical current for magnetization switching in an exchange-biased spin valve (vol 3, pg 361, 2004)

    Y Jiang, T Nozaki, S Abe, T Ochiai, A Hirohata, N Tezuka, K Inomata

    NATURE MATERIALS 4 (4) 353-353 2005年4月

    DOI: 10.1038/nmat1355  

    ISSN: 1476-1122

  8. 24aXN-8 エピタキシャルCo_2Cr_<1-x>Fe_xAlホイスラー合金薄膜の磁気特性(薄膜・人工格子磁性,表面・界面磁性,トンネル分光,領域3(磁性,磁気共鳴))

    廣畑 貴文, 紅林 秀和, 岡村 進, 手束 展規, 猪俣 浩一郎

    日本物理学会講演概要集 60 (1) 408-408 2005年3月4日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  9. L2_1構造を有するCo_2(Cr, Fe)Al薄膜の結晶構造と磁気特性

    廣畑 貴文, 紅林 秀和, 岡村 進, 菊地 麻樹, 正木 達章, 野崎 隆行, 手束 展規, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 399-399 2004年9月21日

  10. ホイスラー合金Co_2V_<1-x>Fe_xAl薄膜の構造、磁気、電気伝導特性

    宮崎 彩, 岡村 進, 手束 展規, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 401-401 2004年9月21日

  11. 微細加工法により作製したCo_2(Cr_<1-x>Fe_x)Al/Al-O/Co_<90>Fe_<10>接合のTMR特性

    岡村 進, 宮崎 彩, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 400-400 2004年9月21日

  12. Co_2CrGaフルホイスラー合金薄膜を用いたMTJの磁気抵抗効果

    菊地 麻樹, 正木 達章, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 403-403 2004年9月21日

  13. Co_2CrGaホイスラー合金の結晶構造と磁気・電気伝導特性

    正木 達章, 菊地 麻樹, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 402-402 2004年9月21日

  14. フェリ磁性結合素子の熱揺らぎ耐性

    櫻田 和孝, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 138-138 2004年9月21日

  15. Coフェライト薄膜の構造と磁気特性

    後藤 龍太, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 303-303 2004年9月21日

  16. Ruスペーサー層を有する強磁性トンネル接合の量子振動効果

    野崎 隆行, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 107-107 2004年9月21日

  17. 強磁性ナノドット層を有する二重トンネル接合におけるTMRのエンハンス

    介川 裕章, 中村 新一, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 112-112 2004年9月21日

  18. GaAs(100)基板上のFe/MgOの結晶成長と磁気・電気伝導特性

    紅林 秀和, 廣畑 貴文, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 104-104 2004年9月21日

  19. 反平行結合フリー層を用いたCPP-GMRにおけるスピン注入磁化反転挙動

    落合 隆夫, JIANG Yong, 廣畑 貴文, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 28 101-101 2004年9月21日

  20. 13aWB-4 GaAs(001) 基板上に成長した Co_2Cr_<1-x>Fe_xAl ホイスラー合金薄膜の結晶構造と磁性(薄膜・人工格子磁性, 領域 3)

    廣畑 貴文, 紅林 秀和, 岡村 進, 手束 展規, 猪俣 浩一郎

    日本物理学会講演概要集 59 (2) 383-383 2004年8月25日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  21. 28aXR-6 GaAs(100)基板上に成長させたCo_2(Cr,Fe)Alホイスラー合金薄膜の結晶構造と磁性(薄膜,人工格子磁性,微小領域磁性)(領域3)

    廣畑 貴文, 紅林 秀和, 岡村 進, 手束 展規, 猪俣 浩一郎

    日本物理学会講演概要集 59 (1) 485-485 2004年3月3日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  22. フルホイスラー合金を用いた強磁性トンネル接合のTMR

    猪俣 浩一郎, 岡村 進, 後藤 龍太, 手束 展規

    日本応用磁気学会研究会資料 134 7-12 2004年1月29日

    ISSN: 1340-7562

  23. Zn_<0.4>Fe_<2.6>O_4薄膜を用いたトンネル接合の磁気抵抗効果

    西村 和正, 手束 展規, 杉本 諭, 猪俣 浩一郎

    電気学会研究会資料. MAG, マグネティックス研究会 2004 (1) 1-6 2004年1月15日

  24. 極薄Ru層によるスピンバルブ素子のCPP-GMRエンハンス

    阿部 慎也, JIANG Yong, 手束 展規, 猪俣 浩一郎

    電気学会研究会資料. MAG, マグネティックス研究会 2004 (1) 7-12 2004年1月15日

  25. 高密度磁気メモリ

    安藤康夫, 手束展規, 大野裕三, 栗野浩之, 久保田均, 大野英男

    電子材料 43 (1) 136-141 2004年

  26. フルホイスラー合金を用いたスピントンネル接合 (特集 スピントロニクス(1)スピン伝導)

    猪俣 浩一郎, 手束 展規, 岡村 進

    マテリアルインテグレ-ション 16 (9) 1-4 2003年9月

    出版者・発行元: ティ-・アイ・シ-

    ISSN: 1344-7858

  27. Co_2(Cr_<1-x>Fe_x)Alフルホイスラー合金を用いたMTJの磁気抵抗効果

    岡村 進, 後藤 龍太, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 27 267-267 2003年9月1日

    ISSN: 1340-8100

  28. 反平行結合フリー層を有するトンネル接合素子のスピン反転挙動

    野崎 隆行, 手束 展規, 杉本 諭, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 27 276-276 2003年9月1日

    ISSN: 1340-8100

  29. Y_2Fe_<14>B/Fe_3B系急冷薄帯におけるナノコンポジット組織と自然共鳴

    前田 徹, 杉本 諭, 籠谷 登志夫, 手束 展規, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 27 407-407 2003年9月1日

    ISSN: 1340-8100

  30. 極薄Ru層を用いたスピンバルブ素子のCPP-GMR特性

    阿部 慎也, YONG J., 手束 展規, 猪俣 浩一郎

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 27 30-30 2003年9月1日

    ISSN: 1340-8100

  31. B-4-18 希土類-鉄-ボロン化合物の GHz 帯電磁波吸収特性

    前田 徹, 杉本 諭, 籠谷 登志夫, 手束 展規, 猪俣 浩一郎

    電子情報通信学会総合大会講演論文集 2003 (1) 385-385 2003年3月3日

    出版者・発行元: 一般社団法人電子情報通信学会

  32. MRAMの最新動向と展望

    猪俣 浩一郎, 手束 展規

    應用物理 71 (11) 1347-1351 2002年11月10日

    出版者・発行元: 応用物理学会

    ISSN: 0369-8009

  33. ピン層にCoFe/CoFeO_x/CoFeを用いた強磁性トンネル接合の熱処理特性

    落合 隆夫, 手束 展規, 猪俣 浩一郎, 杉本 諭

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 26 13-13 2002年9月1日

    ISSN: 1340-8100

  34. 微細反平行結合素子における磁化状態とスピン反転磁場

    小池 伸幸, 手束 展規, 猪俣 浩一郎, 杉本 諭

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 26 15-15 2002年9月1日

    ISSN: 1340-8100

  35. Zn_xFe_<3-x>O_4薄膜の構造および磁気・電気特性

    西村 和正, 手束 展規, 猪俣 浩一郎, 杉本 諭

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 26 452-452 2002年9月1日

    ISSN: 1340-8100

  36. 6pWA-6 微小反平行結合素子の磁化状態(微小領域磁性・磁化過程,領域3)

    手束 展規, 小池 伸幸, 猪俣 浩一郎, 杉本 諭

    日本物理学会講演概要集 57 (2) 337-337 2002年8月13日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  37. 17pPSA-33 サブミクロン反平行結合膜の磁化過程

    手束 展規, 北川 英二, 猪俣 浩一郎, 杉本 諭

    日本物理学会講演概要集 56 (2) 336-336 2001年9月3日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  38. Co_2MnGeホイスラー合金薄膜の構造と磁気特性

    岡村 進, 手束 展規, 猪俣 浩一郎, 杉本 諭, 村上 義弘, 斎藤 今朝美, 三谷 誠司, 高梨 弘毅

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 25 64-64 2001年9月1日

    ISSN: 1340-8100

  39. サブミクロン反平行結合膜のスピン反転挙動

    北川 英二, 野崎 隆行, 手束 展規, 猪俣 浩一郎, 杉本 諭, 渡辺 雅人, 藤森 啓安, 増本 健

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 25 325-325 2001年9月1日

    ISSN: 1340-8100

  40. B-4-57 不均化反応生成サブマイクロ鉄粒子のGHz帯電磁波吸収

    前田 徹, 手束 展規, 籠谷 登志夫, ブック デビッド, 杉本 諭, 猪俣 浩一郎, 太田 博康, 北條 雄司

    電子情報通信学会総合大会講演論文集 2001 (1) 372-372 2001年3月7日

    出版者・発行元: 一般社団法人電子情報通信学会

  41. Characterization of the barrier layer in Al_<1-x>Co_x/{Al_<1-x>Co_x-oxide}/Al tunnel junctions

    HAN X. F., MURAI J., TEZUKA N., KUBOTA H., ANDO Y., MIYAZAKI T.

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 23 278-278 1999年10月1日

  42. Ni_<80>Fe_<20>Co/N(N=Ta, Al)/Al-oxide/Co接合における磁気抵抗効果

    大坊 忠臣, 手束 展規, 久保田 均, 安藤 康夫, 宮崎 照宣

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 23 273-273 1999年10月1日

  43. Ni-Fe/Co/Al-O/Co接合におけるTMRのプラズマ酸化時間及びAl膜厚依存性

    久保田 均, 大塚 茂樹, 上條 誠, YU C. C., 手束 展規, 安藤 康夫, 宮崎 照宣

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 23 272-272 1999年10月1日

  44. 26pPSA-46 Ni_<80>Fe_<20>/Co/N/N-oxide/Co(N=Ta, Al)接合における磁気抵抗効果

    大坊 忠臣, 手束 展規, 久保田 均, 安藤 康夫, 宮崎 照宣

    日本物理学会講演概要集 54 (2) 420-420 1999年9月3日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  45. Magnetoresistive Effect for NiFe/Co/ Al2O3 /Co/NiFe/ FeMn Junctions

    S. Kumagai, N. Tezuka, T. Miyazaki

    J. Magn. Soc. Jpn. 22 5561 1998年

  46. 非弾性電子トンネル分光法(IETS)を用いた強磁性体/絶縁体界面の解析

    村井 純一郎, 安藤 康夫, 手束 展規, 宮崎 照宣

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 21 174-174 1997年10月1日

  47. Wedge状の絶縁層を有する強磁性トンネル接合の磁気抵抗効果

    横田 匡史, 安藤 康夫, 手束 展規, 宮崎 照宣

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 21 173-173 1997年10月1日

  48. NiFe/Co/Al_2O_3/Co/NiFe/FeMn接合の強磁性トンネリング効果

    熊谷 静似, 手束 展規, 宮崎 照宣

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 21 170-170 1997年10月1日

  49. 7a-YG-7 強磁性トンネリング接合素子の磁気抵抗効果

    熊谷 静似, 手束 展規, 宮崎 照宣

    日本物理学会講演概要集 52 (2) 521-521 1997年9月16日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  50. 29P-WB-1 強磁性トンネル接合の磁気抵抗効果

    宮崎 照宣, 手束 展規, 熊谷 静似

    日本物理学会講演概要集 52 (1) 481-481 1997年3月17日

    出版者・発行元: 一般社団法人日本物理学会

    ISSN: 1342-8349

  51. 強磁性トンネル接合における絶縁障壁と磁気抵抗効果

    手束 展規, 安藤 康夫, 宮崎 照宣, TOMPKINS H. G., TEHRANI S. T., GORONKIN H. G.

    日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan 20 136-136 1996年9月1日

  52. 3a-YD-11 強磁性トンネル接合における絶縁障壁と磁気抵抗(磁性(薄膜,人工格子))

    手束 展規, 宮崎 照宣

    日本物理学会講演概要集. 年会 51 (3) 215-215 1996年3月15日

    出版者・発行元: 一般社団法人日本物理学会

  53. EXPERIMENTAL STUDY OF MAGNETIC TUNNELING VALVE EFFECT

    T.Miyazaki, N.Tezuka

    Proceedings of the Third International Symposium on Physics of Magnetic Materials 850-856 1995年

  54. 3p-YA-7 強磁性/Al-Al_2O_3/強磁性接合の磁気トンネリング効果

    手束 展規, 安藤 康夫, 宮崎 照宜

    日本物理学会講演概要集. 秋の分科会 1994 (3) 84-84 1994年8月16日

    出版者・発行元: 一般社団法人日本物理学会

︎全件表示 ︎最初の5件までを表示

共同研究・競争的資金等の研究課題 3

  1. 高性能永久磁石に関する研究 競争的資金

    2000年9月 ~ 継続中

  2. 高周波磁性材料の開発 競争的資金

    2000年9月 ~ 継続中

  3. スピントランスポートデバイスに関する研究 競争的資金

    制度名:The Other Research Programs

    1994年4月 ~ 継続中

社会貢献活動 3

  1. イノベーションジャパン

    2004年9月28日 ~ 2004年9月30日

    詳細を見る 詳細を閉じる

    最新の研究成果を一般に広く伝え,専門外の人たちにも研究成果を共通の知識としてもらうことに協力

  2. リフレッシュ理科教室

    2001年8月6日 ~ 2001年8月7日

    詳細を見る 詳細を閉じる

    小・中学生,ならびに,先生に理科の面白さを知ってもらい,現場の先生方に基礎から最新の科学技術までを知る機会を提供

  3. 東北大学サイエンスカフェ

    2007年7月30日 ~

    詳細を見る 詳細を閉じる

    一般市民と研究者が,コーヒーカップを片手にサイエンスについて気軽に話し合い,サイエンスの楽しさと社会貢献の姿を知ってもらう場に協力.

その他 3

  1. 高スピン分極材料を用いた高出力磁気利用センサの開発

    詳細を見る 詳細を閉じる

    高スピン分極材料を開発し,磁気利用センサの高性能化を試みる

  2. 反平行結合膜を用いたナノサイズCPP-GMR素子の高再生出力に関する研究

    詳細を見る 詳細を閉じる

    反平行結合膜をフリー層に用いた,CPP-GMR素子の再生出力増大に関する研究.

  3. 低磁界・低電力駆動サブミクロン磁性素子の開発

    詳細を見る 詳細を閉じる

    サブミクロン磁性素子の低磁界磁化反転に関する研究