ハーフメタルと高移動度半導体の高品質ヘテロ構造の製作と半導体スピン輸送特性の研究

• Project/Area Number: 23246055
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Hokkaido University
• Principal Investigator: 山本 眞史 北海道大学, 情報科学研究科, 教授 (10322835)
• Co-Investigator(Kenkyū-buntansha): 植村 哲也 北海道大学, 情報科学研究科, 准教授 (20344476) ; 松田 健一 北海道大学, 情報科学研究科, 助教 (80360931)
• Project Period (FY): 2011-05-31 – 2014-03-31
• Project Status: Declined (Fiscal Year 2013)
• Budget Amount: ¥50,050,000 (Direct Cost: ¥38,500,000、Indirect Cost: ¥11,550,000); Fiscal Year 2013: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000); Fiscal Year 2012: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000); Fiscal Year 2011: ¥31,330,000 (Direct Cost: ¥24,100,000、Indirect Cost: ¥7,230,000)
• Keywords: スピントロニクス / ハーフメタル / 高移動度半導体 / ヘテロ構造 / スピン輸送特性

Research Abstract

本研究の目的は本質的に大きなスピン偏極率を有するハーフメタル材料のCo基ホイスラー合金と，高移動度半導体チャネル(Ge等)を融合する高品質エピタキシャルヘテロ構造の実現を通して，次世代半導体スピントロニクスの基盤を構築することである．平成24年度は，強磁性CoFe電極からMgOバリアを通したn-Geチャネルへのスピン注入の特性を実験的に詳細に検討し，以下の知見を明らかにした．
CoFe/MgO/n-Ge接合に対して，2.25 nmから2.75 nm の範囲のMgOバリア厚み(t_MgO)に対して，室温で，3端子配置により明瞭なHanle信号(磁化は面内，磁場を面に垂直に印加)および逆Hanle信号(磁場を面内に印加)を観測した(スピン注入の方向: 強磁性体から半導体チャネルへのスピン注入)．また，スピン信号ΔVの大きさ(Hanle信号と逆Hanle信号の和)から見積もったspin-RA積(ΔRsA=(ΔV/I_bias)A)は，例えばt_MgO=2.4 nmの接合に対して，半導体へのスピン注入の標準理論(Fert and Jaffres, 2001)の値の4桁大きな値であった．さらに，spin-RA積はt_MgOに対して指数関数的な依存性を示すことを見出した．一方，標準理論では，spin-RA積はt_MgOに対して依存性を示さない．このように，これらの実験結果は，観測されたHanle信号が半導体Geチャネルでのスピン蓄積によるというモデルでは説明できない．この結果を説明するため，トンネル接合界面に存在する局在状態での，磁場によるスピンの歳差運動によりスピン偏極率が低下し，このためフェルミレベルでのアップスピンとダウンスピンの波数が変化し，結果として，トンネル確率が磁場によって変調されるというモデルを提案した．

Current Status of Research Progress

Reason

翌年度、交付申請を辞退するため、記入しない。

Strategy for Future Research Activity

翌年度、交付申請を辞退するため、記入しない。

Research Products

• [Journal Article] Effects of off-stoichiometry on the spin polarization at the Co2MnβGe0.38 MgO interfaces: X-ray magnetic circular dichroismstudy (2012)
  • Author(s): V.R. Singh
  • Journal Title: Phys. Rev. B Volume: 86 Issue: 14
  • DOI: 10.1103/physrevb.86.144412
  • Peer Reviewed
• [Journal Article] Giant tunneling magnetoresistance in epitaxial Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions by half-metallicity of Co2MnSi and coherent tunneling (2012)
  • Author(s): H.-x. Liu, Y. Honda, T. Taira, K.-i. Matsuda, M. Arita, T. Uemura, and M. Yamamoto
  • Journal Title: Appl. Phys. Lett. Volume: 101 Issue: 13
  • DOI: 10.1063/1.4755773
  • NAID: 120004883878
  • Peer Reviewed
• [Journal Article] Critical effect of spin-dependent transport in a tunnel barrier on enhanced Hanle-type signals observed in three-terminal geometry (2012)
  • Author(s): T. Uemura, K. Kondo, J. Fujisawa, K.-i.Matsuda, and M. Yamamoto
  • Journal Title: Appl. Phys. Lett Volume: vol.101 Issue: 13
  • DOI: 10.1063/1.4754545
  • NAID: 120004883874
  • Peer Reviewed
• [Journal Article] Highly spin-polarized tunneling in epitaxial magnetic tunnel junctions with a Co2MnSi electrode and a MgO barrier with improved interfacial structural properties (2012)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, M. Arita, T. Uemura, and M. Yamamoto
  • Journal Title: Jpn. J. Appl. Phys. Volume: 51 Issue: 9R Pages: 093004-093004
  • DOI: 10.1143/jjap.51.093004
  • NAID: 210000141192
  • Peer Reviewed
• [Journal Article] Fabrication of fully epitaxial CoFe/MgO/CoFe magnetic tunnel junctions on Ge(001) substrates via a MgO interlayer (2012)
  • Author(s): G.-f. Li, T. Taira, H.-x. Liu, K.-i. Matsuda, M. Arita, T. Uemura, and M. Yamamoto
  • Journal Title: Jpn. J. Appl. Phys. Volume: 51 Issue: 9R Pages: 093003-093003
  • DOI: 10.1143/jjap.51.093003
  • NAID: 40019424935
  • Peer Reviewed
• [Journal Article] Magnetometry of buried layers-linear magnetic dichroism and spin detection in angular resolved hard X-ray photoelectron spectroscopy (2012)
  • Author(s): A.Gloskovskii, G.Stryganyuk, G.H.Fecher, C.Felser, S.Thiess, H.Schulz-Ritter, W.Drube, G.Berner, M.Sing, R.Claessen, M.Yamamoto
  • Journal Title: Journal of Electron Spectroscopy and Related Phenomena Volume: 185 Issue: 1-2 Pages: 47-52
  • DOI: 10.1016/j.elspec.2011.11.005
  • Peer Reviewed
• [Journal Article] Effect of MgO Barrier Insertion on Spin-Dependent Transport Properties of CoFe/n-GaAs Heterojunctions (2012)
  • Author(s): T.Akiho, T.Uemura, M.Harada, K.-i.Matsuda, M.Yamamoto
  • Journal Title: Jpn.J.Appl.Phys. Volume: 51 Issue: 2S Pages: 02BM01-02BM01
  • DOI: 10.1143/jjap.51.02bm01
  • NAID: 210000140290
  • Peer Reviewed
• [Journal Article] Surface spin polarization of the nonstoichiometric Heusler alloy Co_2MnSi (2012)
  • Author(s): J.-P.Wustenberg, R.Fetzer, M.Aeschlimann, M.Cinchetti, J.Minar, Jurgen Braun, H.Ebert, T.Ishikawa, T.Uemura, M.Yamamoto
  • Journal Title: Phys.Rev.B Volume: 85 Issue: 6
  • DOI: 10.1103/physrevb.85.064407
  • Peer Reviewed
• [Journal Article] Non-local detection of spin-polarized electrons at room temperature in Co_<50>Fe_<50>/GaAs Schottky tunnel junctions (2011)
  • Author(s): T.Uemura, T.Akiho, M.Harada, K.-i.Matsuda, M.Yamamoto
  • Journal Title: Appl.Phys.Lett. Volume: 99 Issue: 8
  • DOI: 10.1063/1.3630032
  • Peer Reviewed
• [Journal Article] Magnetic dichroism in angle-resolved hard x-ray photoemission from buried layers (2011)
  • Author(s): X.Kozina, G.H.Fecher, G.Stryganyuk, S.Ouardi, B.Balke, C.Felser, G.Schonhense, E.Ikenaga, T.Sugiyama, N.Kawamura, M.Suzuki, T.Taira, T.Uemura, M.Yamamoto, H.Sukegawa, W.H.Wang, K.Inomata, K.Kobayash
  • Journal Title: Physical Review B Volume: 84 Issue: 5
  • DOI: 10.1103/physrevb.84.054449
  • Peer Reviewed
• [Journal Article] Epitaxial growth of Heusler alloy Co_2MnSi/MgO heterostructures on Ge(001) substrates (2011)
  • Author(s): G.-f.Li, T.Taira, K.-i.Matsuda, M.Arita, T.Uemura, M.Yamamoto
  • Journal Title: Applied Physics Letters Volume: 98 Issue: 26
  • DOI: 10.1063/1.3605675
  • Peer Reviewed
• [Journal Article] Suppression of in-plane tunneling anisotropic magnetoresistance effect in Co_2MnSi/MgO/n-GaAs and CoFe/MgO/n-GaAs junctions by inserting a MeO barrier (2011)
  • Author(s): T.Akiho, T.Uemura, M.Harada, K.-i.Matsuda, M.Yamamoto
  • Journal Title: Appl.Phys.Lett. Volume: 98 Issue: 23
  • DOI: 10.1063/1.3595311
  • Peer Reviewed
• [Journal Article] Influence of GaAs surface structure on tunneling anisotropic magnetoresistance and magnetocrystalline anisotropy in epitaxial Co_<50>Fe_<50>/n-GaAs junctions (2011)
  • Author(s): T.Uemura, M.Harada, T.Akiho, K.-i.Matsuda, M.Yamamoto
  • Journal Title: Appl.Phys.Lett. Volume: 98 Issue: 10
  • DOI: 10.1063/1.3561759
  • Peer Reviewed
• [Presentation] High Resolution Scanning Transmission Electron Microscopy Shows MnMn/O Termination at the Co2MnSi/MgO Interface in a Magnetic Tunnel Junction (2013)
  • Author(s): F.-y. Shi, H.-x. Liu, M. Yamamoto, and P. Voyles
  • Organizer: 2013 Material Research Society (MRS) Spring Meeting
  • Place of Presentation: Moscone West Convention Center, San Francisco, California, USA
• [Presentation] Transient effects on oblique Hanle signals observed in ferromagnet/semiconductor heterojunctions with non-local four-terminal configuration (2013)
  • Author(s): T. Akiho, J.-h. Shan, K.-i. Matsuda, M. Yamamoto, and T. Uemura
  • Organizer: 12th Joint MMM/Intermag Conf.
  • Place of Presentation: Hyatt Regency Chicago, Chicago, Illinois, USA
• [Presentation] Influence of interfacial structural properties on tunnel magnetoresistance in epitaxial magnetic tunnel junctions with Co2MnSi electrode and MgO barrier (2013)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, M. Arita, T. Uemura, and M. Yamamoto
  • Organizer: 12th Joint MMM/Intermag Conf.
  • Place of Presentation: Hyatt Regency Chicago, Chicago, Illinois, USA
• [Presentation] MnMn/O and CoCo/O terminations at Co2MnSi/MgO interface in a magnetic tunnel junction investigated by high resolution scanning transmission electron microscopy (2013)
  • Author(s): F.-y. Shi, H.-x. Liu, M. Yamamoto, and P. Voyles
  • Organizer: 12th Joint MMM/Intermag Conf.
  • Place of Presentation: Hyatt Regency Chicago, Chicago, Illinois, USA
• [Presentation] Influence of interfacetermination layeron temperature dependenceof tunneling magnetoresistance of Co2MnSi/MgO-based magnetic tunnel junctions (2013)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, T. Uemura, M. Yamamoto, F.-y. Shi, and P. Voyles
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 神奈川工科大学，厚木市，神奈川県
• [Presentation] Annealing temperature dependence of spin signals observed inCo2MnSi/CoFe/n-GaAs through four-terminal non-local geometry (2013)
  • Author(s): T. Akiho, J. Shan, K.-i. Matsuda, M. Yamamoto, and T. Uemura
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 神奈川工科大学，厚木市，神奈川県
• [Presentation] GaAsショットキートンネル障壁を介した強磁性体からInGaAsチャネルへのスピン注入 (2013)
  • Author(s): 鳥野剛史，松田健一，山本眞史，植村哲也
  • Organizer: 2013年 (平成25年) 第48回応用物理学会北海道支部学術講演会
  • Place of Presentation: 釧路市生涯学習センター「まなぼっと幣舞」，釧路市，北海道
• [Presentation] Nb/Cu50Ni50二層薄膜の電気伝導特性と超伝導近接効果 (2013)
  • Author(s): 蝦名優也，松田健一，植村哲也，山本眞史
  • Organizer: 2013年 (平成25年) 第48回応用物理学会北海道支部学術講演会
  • Place of Presentation: 釧路市生涯学習センター「まなぼっと幣舞」，釧路市，北海道
• [Presentation] Co2MnSi/CoFe/MgO/SiにおけるHanle信号のMgO膜厚依存性 (2013)
  • Author(s): 藤澤潤，松田健一，山本眞史，植村哲也
  • Organizer: 2013年 (平成25年) 第48回応用物理学会北海道支部学術講演会
  • Place of Presentation: 釧路市生涯学習センター「まなぼっと幣舞」，釧路市，北海道
• [Presentation] Co_2MnSiホイスラー合金を用いたGaAsへの電気的スピン注入および動的核スピン偏極の電気的検出 (2012)
  • Author(s): 秋保貴史, 植村哲也, 松田健一, 山本眞史
  • Organizer: 2012年(平成24年)春季第59回応用物理学関係連合講演会
  • Place of Presentation: 早稲田大学(東京都)
  • Year and Date: 2012-03-17
• [Presentation] CoFe/MgO/Siにおけるスピン蓄積信号のMgO膜厚依存性 (2012)
  • Author(s): 植村哲也, 藤澤潤, 松田健一, 山本眞史
  • Organizer: 2012年(平成24年)春季第59回応用物理学関係連合講演会
  • Place of Presentation: 早稲田大学(東京都)
  • Year and Date: 2012-03-17
• [Presentation] Spin-dependent transport characteristics of epitaxial magnetic tunnel junctions of CoFe/MgO/CoFe ultrathin layer/Co_2MnSi (2012)
  • Author(s): H.-x.Liu, Y.Honda, T.Taira, K.-i.Matsuda, T.Uemura, Y.Miura, M.Shirai, M.Yamamoto
  • Organizer: 2012年(平成24年)春季第59回応用物理学関係連合講演会
  • Place of Presentation: 早稲田大学(東京都)
  • Year and Date: 2012-03-16
• [Presentation] Fabrication of fully epitaxial magnetic tunnel junctions with a Heusler alloy Co_2MnSi thin film and a MgO barrier on Ge(001) substrates (2012)
  • Author(s): G.-f.Li, T.Taira, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 2012年(平成24年)春季第59回応用物理学関係連合講演会
  • Place of Presentation: 早稲田大学(東京都)
  • Year and Date: 2012-03-16
• [Presentation] Tunnel magnetoresistance in fully epitaxial CoFe/MgO/CoFe magnetic tunnel junctions on Ge(001) substrates via a MgO interlayer (2012)
  • Author(s): G.-f.Li, T.Taira, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 5th Int'l Symposium on Global COE Program of Center for Next-Generation Information Technology Based on Knowledge Discovery and Knowledge Federation
  • Place of Presentation: Hokkaido University (Sapporo)
  • Year and Date: 2012-01-16
• [Presentation] Spin transport properties of fully epitaxial magnetic tunnel junctions of CoFe/MgO/CoFe ultrathin layer/Co_2MnSi (2012)
  • Author(s): H.-x.Liu, T.Taira, Y.Honda, K.-i.Matsuda, T.Uemura, M.Yamamoto, Y.Miura, M.Shirai
  • Organizer: 5th Int'l Symposium on Global COE Program of Center for Next-Generation Information Technology Based on Knowledge Discovery and Knowledge Federation
  • Place of Presentation: Hokkaido University (Sapporo)
  • Year and Date: 2012-01-16
• [Presentation] Spin-polarized transport in fully epitaxial CoFe/MgO/CoFe ultrathin layer/Co_2MnSi magnetic tunnel junction (2012)
  • Author(s): H.-x.Liu, Y.Honda, T.Taira, K.-i.Matsuda, T.Uemura, Y.Miura, M.Shirai, M.Yamamoto
  • Organizer: 2012年(平成24年)第47回応用物理学会北海道支部学術講演会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2012-01-06
• [Presentation] Co_2MnSi/MgO/NbNヘテロ構造を用いたホイスラー合金Co_2MnSiのスピン偏極率評価 (2012)
  • Author(s): 篠木崇帆, 松田健一, 平智幸, 植村哲也, 山本眞史
  • Organizer: 2012年(平成24年)第47回応用物理学会北海道支部学術講演会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2012-01-06
• [Presentation] Tunnel magnetoresistance in fully epitaxial CoFe/MgO/CoFe magnetic tunnel junctions on Ge(001) substrates via a MgO interlayer (2012)
  • Author(s): G.-f.Li, T.Taira, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 2012年(平成24年)第47回応用物理学会北海道支部学術講演会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2012-01-06
• [Presentation] Co_2MnSi/CoFe/n-GaAsにおけるスピン輸送と核磁場の検出 (2012)
  • Author(s): 秋保貴史, 原田雅亘, 植村哲也, 松田健一, 山本眞史
  • Organizer: 2012年(平成24年)第47回応用物理学会北海道支部学術講演会
  • Place of Presentation: 北海道大学(札幌市)
  • Year and Date: 2012-01-06
• [Presentation] Electrical spin injection and electrical detection of dynamic nuclear polarization in ferromagnet/semiconductor heterojunctions (2012)
  • Author(s): T. Akiho, J.-h. Shan, K.-i. Matsuda, M. Yamamoto, and T. Uemura
  • Organizer: International Workshop on Spintronic Nano Materials 2012
  • Place of Presentation: Hokkaido Univ., Sapporo, Japan
  • Invited
• [Presentation] Enhanced coherent tunneling contribution in epitaxial magnetic tunnel junctions with a Co2MnSi electrode and a MgO barrier due to improved interfacial structural properties (2012)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: The 2nd Int’l Conf. of Asia Union of Magnetics Societies (ICAUMS 2012), The 36th Annual Conf. on Magnetics in Japan
  • Place of Presentation: Nara Prefectural New Public Hall, Nara, Japan
• [Presentation] Temperature dependence of spin-dependent tunneling resistances of MgO-buffered Co2MnSi/MgO/Co2MnSi magnetic tunnel junctions (2012)
  • Author(s): Y. Honda, H.-x. Liu, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: 2012 Int’l Conf. on Solid State Devices and Materials (SSDM 2012)
  • Place of Presentation: Kyoto International Conference Center, Kyoto, Japan
• [Presentation] Transient oblique Hanle signals observed in Co2MnSi/CoFe/n-GaAs with non-local four-terminal configuration (2012)
  • Author(s): J.-h. Shan, T. Akiho, K.-i. Matsuda, M. Yamamoto, and T. Uemura
  • Organizer: 2012 Int’l Conf. on Solid State Devices and Materials (SSDM 2012)
  • Place of Presentation: Kyoto International Conference Center, Kyoto, Japan
• [Presentation] Tunnel barrier thickness dependence of Hanle-type signals in CoFe/MgO/n-Si and CoFe/MgO/n-Ge junctions investigated through three-terminal configuration (2012)
  • Author(s): T. Uemura, G.-f. Li, J. Fujisawa, K. Kondo, K.-i. Matsuda, and M. Yamamoto
  • Organizer: 2012 Int’l Conf. on Solid State Devices and Materials (SSDM 2012)
  • Place of Presentation: Kyoto International Conference Center, Kyoto, Japan
• [Presentation] Tunnel barrier thickness dependence of Hanle-type signals in CoFe/MgO/n-Ge tunnel junctions investigated through three-terminal configuration (2012)
  • Author(s): G.-f. Li, M. Miki, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: The 17th Int’l Conf. on Molecular Beam Epitaxy (MBE 2012)
  • Place of Presentation: Nara Prefectural New Public Hall, Nara, Japan
• [Presentation] Spin-polarization measurements for Co2MnSi using Co2MnSi/MgO/NbN epitaxial tunnel junctions (2012)
  • Author(s): Ken-ichi Matsuda, Takaho Shinoki, Tomoyuki Taira, Tetsuya Uemura, and Masafumi Yamamoto
  • Organizer: The 19th Int’l Conf. on Magnetism (ICM2012)
  • Place of Presentation: BEXCO, Busan, Korea
• [Presentation] Possibility of Superconducting Proximity Effect of Equal-spin Triplet Components in NbN/Co2Cr0.6Fe0.4Al/NbN Junctions (2012)
  • Author(s): Ken-ichi Matsuda, Tetsuya Uemura, and Masafumi Yamamoto
  • Organizer: Int’l Conf. on Topological Quantum Phenomena (TQP2012)
  • Place of Presentation: Nagoya University, Nagoya, Japan
• [Presentation] Temperature dependence of spin-dependent tunneling conductances of fully epitaxial Co2MnSi-based magnetic tunnel junctions (2012)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: Int’l Magnetics Conf. 2012 (INTERMAG 2012)
  • Place of Presentation: Vancouver Convention Center, Vancouver, Canada
• [Presentation] Electrical spin injection from Co2MnSi Heusler alloy into GaAs and electrical detection of dynamic nuclear polarization (2012)
  • Author(s): T. Akiho, T. Uemura, K.-i. Matsuda, and M. Yamamoto
  • Organizer: Int’l Magnetics Conf. 2012 (INTERMAG 2012)
  • Place of Presentation: Vancouver Convention Center, Vancouver, Canada
• [Presentation] MgO thickness dependence of spin accumulation signal in Co50Fe50/MgO/Si (2012)
  • Author(s): T. Uemura, J. Fujisawa, K.-i. Matsuda, and M. Yamamoto
  • Organizer: Int’l Magnetics Conf. 2012 (INTERMAG 2012)
  • Place of Presentation: Vancouver Convention Center, Vancouver, Canada
• [Presentation] 高スピン偏極材料を用いたGaAsへのスピン注入 (2012)
  • Author(s): 植村哲也，秋保貴史，松田健一，山本眞史
  • Organizer: 第17回半導体スピン工学の基礎と応用(PASPS17)
  • Place of Presentation: 九州大学，福岡市，福岡県
  • Invited
• [Presentation] CoFe/MgO/SC(SC = Si or Ge)におけるHanle信号の半導体種依存性 (2012)
  • Author(s): 植村哲也, 李桂芳, 藤澤潤, 松田健一, 山本眞史
  • Organizer: 第17回半導体スピン工学の基礎と応用(PASPS17)
  • Place of Presentation: 九州大学，福岡市，福岡県
• [Presentation] Temperature dependence of spin-dependent tunneling resistances of fully epitaxial Co2MnSi-based magnetic tunnel junctions (2012)
  • Author(s): H.-x. Liu, Y. Honda, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: 2012年 (平成24年) 秋季第73回応用物理学会学術講演会
  • Place of Presentation: 愛媛大学および松山大学，松山市，愛媛県
• [Presentation] Co2MnSi/MgO/NbN接合を用いたホイスラー合金Co2MnSiのスピン偏極率評価 (2012)
  • Author(s): 松田健一，篠木崇帆，植村哲也，山本眞史
  • Organizer: 2012年 (平成24年) 秋季第73回応用物理学会学術講演会
  • Place of Presentation: 愛媛大学および松山大学，松山市，愛媛県
• [Presentation] MgO tunnel barrier thickness dependence of three-terminal Hanle-type signals in CoFe/MgO/n-Ge tunnel junctions (2012)
  • Author(s): G.-f. Li, M. Miki, K.-i. Matsuda, T. Uemura, and M. Yamamoto
  • Organizer: 2012年 (平成24年) 秋季第73回応用物理学会学術講演会
  • Place of Presentation: 愛媛大学および松山大学，松山市，愛媛県
• [Presentation] 非局所四端子配置を用いたCo2MnSi/CoFe/n-GaAs ショットキートンネル接合におけるoblique Hanle 信号の過渡特性 (2012)
  • Author(s): 単津海，秋保貴史，松田健一，山本眞史，植村哲也
  • Organizer: 2012年 (平成24年) 秋季第73回応用物理学会学術講演会
  • Place of Presentation: 愛媛大学および松山大学，松山市，愛媛県
• [Presentation] Co_2MnSiを用いたGaAsへのスピン注入および動的核スピンの検出 (2011)
  • Author(s): 秋保貴史, 原田雅亘, 植村哲也, 松田健一, 山本眞史
  • Organizer: The 16^<th> Symposium on the Physics and Application of Spin-Related Phenomena in Semiconductors (PASPS-16)
  • Place of Presentation: 東京工業大学(東京都)
  • Year and Date: 2011-11-29
• [Presentation] Non-local electrical detection of Hanle signals in Co_2MnSi/Co_<50>Fe_<50>/n-GaAs Schottky tunnel junctions (2011)
  • Author(s): T.Akiho, T.Uemura, H.Harada, K.-i., Matsuda, M.Yamamoto
  • Organizer: 56th Annual Conf.on Magnetism & Magnetic Materials
  • Place of Presentation: The JW Marriott Desert Ridge (USA)
  • Year and Date: 2011-11-03
• [Presentation] Almost identical oscillations in tunneling resistances as a function of barrier thickness for parallel and antiparallel configurations for fully epitaxial magnetic tunnel junctions with a MsO barrier (2011)
  • Author(s): Y.Honda, S.Hirata, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 56th Annual Conf.on Magnetism & Magnetic Materials
  • Place of Presentation: The JW Marriott Desert Ridge (USA)
  • Year and Date: 2011-11-02
• [Presentation] Spin-dependent transport properties of fully epitaxial magnetic tunnel junctions of CoFe/MgO/CoFe ultrathin layer/Co_2MnSi (2011)
  • Author(s): H.-x.Liu, T.Taira, Y.Honda, K.-i.Matsuda, T.Uemura, M.Yamamoto, Y.Miura, M.Shirai
  • Organizer: 56th Annual Conf.on Magnetism & Magnetic Materials
  • Place of Presentation: The JW Marriott Desert Ridge (USA)
  • Year and Date: 2011-11-01
• [Presentation] Fabrication of epitaxial magnetic tunnel junctions with a Co_2MnSi thin film a MgO barrier on Ge(001) substrates via a MgO interlayer (2011)
  • Author(s): G.-f.Li, T.Taira, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 56th Annual Conf.on Magnetism & Magnetic Materials
  • Place of Presentation: The JW Marriott Desert Ridge (USA)
  • Year and Date: 2011-11-01
• [Presentation] Fabrication of fully epitaxial magnetic tunnel junctions with CoFe electrodes and a MgO barrier on Ge(001) substrates via a MgO interlayer (2011)
  • Author(s): G.-f.Li, T.Taira, H.-x.Liu, K.-i.Matsuda T.Uemura, M.Yamamoto
  • Organizer: 2011 Int'l Conf.on Solid State Devices and Matenals
  • Place of Presentation: Aichi Industry & Labor Center (Nagoya)
  • Year and Date: 2011-09-30
• [Presentation] Effect of MgO Barrier Insertion on Spin-dependent Transport Properties of CoFe/n-GaAs (2011)
  • Author(s): T.Akiho, M.Harada, T.Uemura, K.-i.Matsuda M.Yamamoto
  • Organizer: 2011 Int'l Conf.on Solid State Devices and Materials
  • Place of Presentation: Aichi Industry & Labor Center (Nagoya)
  • Year and Date: 2011-09-30
• [Presentation] Co_<50>Fe_<50>電極からGaAsへのスピン注入の電気的検出 (2011)
  • Author(s): 植村哲也, 秋保貴史, 原田雅亘, 松田健一, 山本眞史
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 朱鷺メッセ(新潟市)
  • Year and Date: 2011-09-30
• [Presentation] Effect of GaAs Surface Structure on Tunneling Anisotropic Magnetoresistance in Epitaxial Co_<50>Fe_<50>/n-GaAs Junctions (2011)
  • Author(s): T.Uemura, T.Akiho, M.Harada, K.-i.Matsuda, M.Yamamoto
  • Organizer: 2011 Int'l Conf.on Solid State Devices and Materials
  • Place of Presentation: Aichi Industry & Labor Center (Nagoya)
  • Year and Date: 2011-09-29
• [Presentation] Epitaxial growth of Heusler alloy Co_2MnSi thin films on Ge(001) substrates via a MgO interlayer (2011)
  • Author(s): G.-f.Li, T.Taira, K.-i.Matsuda, M.Arita, T.Uemura, M.Yamamoto
  • Organizer: 第35回日本磁気学会学術講演会
  • Place of Presentation: 朱鷺メッセ(新潟市)
  • Year and Date: 2011-09-27
• [Presentation] Co_2MnSi/MgO/Co_2MnSiエピタキシャルMTJにおけるトンネル抵抗のバリア膜厚に対する磁化平行と反平行に共通する振動 (2011)
  • Author(s): 本田佑輔, 平田進之佑, 劉宏喜, 松田健一, 植村哲也, 山本眞史
  • Organizer: 2011秋季第72回応用物理学関係連合講演会
  • Place of Presentation: 山形大学(山形市)
  • Year and Date: 2011-09-02
• [Presentation] CoFe/n-GaAsヘテロ接合におけるスピン依存伝導特性のMgO層挿入効果 (2011)
  • Author(s): 秋保貴史, 植村哲也, 原田雅亘, 松田健一, 山本眞史
  • Organizer: 2011秋季第72回応用物理学関係連合講演会
  • Place of Presentation: 山形大学(山形市)
  • Year and Date: 2011-08-31
• [Presentation] Co_<50>Fe_<50>を用いたGaAsへの室温におけるスピン注入 (2011)
  • Author(s): 植村哲也, 秋保貴史, 原田雅亘, 松田健一, 山本眞史
  • Organizer: 2011秋季第72回応用物理学関係連合講演会
  • Place of Presentation: 山形大学(山形市)
  • Year and Date: 2011-08-31
• [Presentation] Structural and magnetic properties of epitaxially grown Heusler alloy Co_2MnSi/MgO heterostructures on Ge(001) substrates (2011)
  • Author(s): G.-f.Li, T.Taira, K.-i.Matsuda, M.Arita, T.Uemura, M.Yamamoto
  • Organizer: 2011秋季第72回応用物理学関係連合講演会
  • Place of Presentation: 山形大学(山形市)
  • Year and Date: 2011-08-30
• [Presentation] CoFeおよびホイスラー合金Co_2MnSiを用いたGaAsへのスピン注入 (2011)
  • Author(s): 植村哲也, 秋保貴史, 原田雅亘, 松田健一, 山本眞史
  • Organizer: 第36回「スピンエレクトロニクス専門研究会」
  • Place of Presentation: 中央大学(東京都)(招待講演)
  • Year and Date: 2011-08-22
• [Presentation] Spin-dependent tunneling characteristics of Heusler alloy/MgO heterostructures (2011)
  • Author(s): M.Yamamoto, T.Uemura, K.-i.Matsuda
  • Organizer: 5^<th> Int'l Workshop on Spin Currents
  • Place of Presentation: Sendai International Cente (Sendai)(招待講演)
  • Year and Date: 2011-07-27
• [Presentation] Spin injection from Co_<50>Fe_<50> into GaAs at room temperature (2011)
  • Author(s): T.Akiho, M.Harada, T.Uemura, K.-i.Matsuda, M.Yamamoto
  • Organizer: 5^<th> Int'l Workshop on Spin Currents
  • Place of Presentation: Sendai International Cente (Sendai)
  • Year and Date: 2011-07-27
• [Presentation] Oscillations in spin-dependent tunneling resistances as a function of MgO barrier thickness in epitaxial magnetic tunnel junctions with Heusler alloy Co_2MnSi electrodes (2011)
  • Author(s): Y.Honda, S.Hirata, H.-x.Liu, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: 5^<th> Int'l Workshop on Spin Currents
  • Place of Presentation: Sendai International Cente (Sendai)
  • Year and Date: 2011-07-27
• [Presentation] Effect of chemical composition in Co_2MnSi thin films facing an MgO barrier on magnetic states of Mn Co atoms (2011)
  • Author(s): T.Kadono, V.R.Singh, V.K.Verma, K.Ishigami, G.Shibata, A.Fujimori, D.Asakura, T.Koide, Guifang Li, T.Ishikawa, M.Yamamoto
  • Organizer: 5^<th> Int'l Workshop on Spin Currents
  • Place of Presentation: Sendai International Cente (Sendai)
  • Year and Date: 2011-07-26
• [Presentation] Electrical detection of spin injection from Co_<50>Fe_<50> into GaAs at room temperature (2011)
  • Author(s): T.Uemura, M.Harada, T.Akiho, K.-i.Matsuda, M.Yamamoto
  • Organizer: 15th Int'l Conf.on Modulated Semiconductor Structures (MSS 15)
  • Place of Presentation: Florida State University Conference Center (USA)
  • Year and Date: 2011-07-26
• [Presentation] Epitaxial growth of Heusler alloy Co_2MnSi/MgO heterostructure on Ge(001) substrate (2011)
  • Author(s): G.-f.Li, T.Taira, K.-i.Matsuda, T.Uemura, M.Yamamoto
  • Organizer: Int'l Magnetics Conf.2011 (INTERMAG 2011)
  • Place of Presentation: Taipei International Convention Center (Taiwan)
  • Year and Date: 2011-04-29
• [Presentation] Spin-dependent transport properties of Co_2MnSi/MgO/n-GaAs tunnel junctions (2011)
  • Author(s): T.Akiho, M.Harada, T.Uemura, K.-i.Matsuda, M.Yamamoto
  • Organizer: Int'l Magnetics Conf.2011(INTERMAG 2011)
  • Place of Presentation: Taipei International Convention Center (Taiwan)
  • Year and Date: 2011-04-26
• [Presentation] Electrical injection and detection of spin-polarized electrons in an epitaxial Co_<50>Fe_<50>/n-GaAs junction (2011)
  • Author(s): T.Uemura, M.Harada. T.Akiho, K.-i.Matsuda, M.Yamamoto
  • Organizer: Int'l Magnetics Conf.2011 (INTERMAG 2011)
  • Place of Presentation: Taipei International Convention Center (Taiwan)
  • Year and Date: 2011-04-26