Investigation for inceasement of magnetoresistance through semiconductore chanel

• Project/Area Number: 26286036
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Applied materials
• Research Institution: Tohoku University
• Principal Investigator: Tezuka Nobuki 東北大学, 工学(系)研究科(研究院), 准教授 (40323076)
• Co-Investigator(Kenkyū-buntansha): 斉藤 好昭 株式会社東芝研究開発センター, 研究開発センター, 研究主幹 (80393859)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000); Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000); Fiscal Year 2014: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
• Keywords: スピントロニクス / スピン注入 / 磁気抵抗効果 / 半導体 / スピントランジスタ / フルホイスラー合金 / スピンシグナル / スピンMOSFET / スピンFET / スピン信号 / 微細素子作製 / 強磁性トンネル接合

Outline of Final Research Achievements

The relationship between gap length and spin signal in Si/MgO/ferromagent devices was investigated. It was found that the amount of re-deposition metal in microfabrication process reduced by the optimaization of milling process. For the devices with Co2FeSi Heusler material electrode, spin injection efficiency of about 40% by four termianl Hanle method, and magnetoresistance ratio of about 1% by two terminal method were obtained at room temperature.
The tunnnel magnetoresistance was investigated for magnetic tunnel junctions on Si with MgO tunnel barrier and antiferromagnetic coupling layer using CoFeB and W. The resistivity of about 10 μm2 and magnetoresistance ratio of about 250% were obtained.

Research Products

• [Journal Article] Room temperature observation of high spin polarization in post annealed Co2FeSi/MgO/n+-Si on insulator devices (2017)
  • Author(s): A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka and Y. Saito
  • Journal Title: Jpn. J. Appl. Phys. Volume: 56 Issue: 4S Pages: 04CD05-04CD05
  • DOI: 10.7567/jjap.56.04cd05
  • NAID: 210000147565
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Spin accumulation and transport signals in CoFe/MgO/Si devices with confined structure of n+-Si layer (2017)
  • Author(s): Y. Saito, T. Inokuchi, M. Ishikawa, A. Tiwari, H. Sugiyama,
  • Journal Title: AIP Advances Volume: 7 Issue: 5
  • DOI: 10.1063/1.4978583
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Effect of post annealing on spin accumulation and transport signals in Co2FeSi/MgO/n+-Si on insulator devices (2016)
  • Author(s): A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka and Y. Saito
  • Journal Title: AIP Advances Volume: 6 Issue: 7
  • DOI: 10.1063/1.4960210
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Perpendicular Magnetic Tunnel Junctions With Low Resistance-Area Product: High Output Voltage and Bias Dependence of Magnetoresistance (2016)
  • Author(s): N. Tezuka, S. Oikawa, I. Abe, M. Matsuura, S. Sugimoto, K. Nishimura, T.Seino
  • Journal Title: IEEE Magnetics Letters Volume: 7 Pages: 1-4
  • DOI: 10.1109/lmag.2016.2584582
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 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 (2016)
  • Author(s): N. Tezuka, Y. Saito
  • Journal Title: Materila Transactions Volume: 57
  • NAID: 130005153169
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Correlation between amplitude of spin accumulation signals investigated by Hanle effect measurement and effective junction barrier height in CoFe/MgO/n+-Si junctions (2015)
  • Author(s): Y. Saito, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka
  • Journal Title: Journal of Applied Physics Volume: 117 Issue: 17
  • DOI: 10.1063/1.4907242
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Comparison of Spin Signals Between 3T Hanle and 4T Non-Local Methods for Co2Fe(Al,Si)/n-GaAs Junctions (2014)
  • Author(s): N. Tezuka, T. Saito, M. Matsuura, S. Sugimoto
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS Volume: 50 Issue: 11 Pages: 2600204-2600207
  • DOI: 10.1109/tmag.2014.2325942
  • Peer Reviewed / Open Access
• [Presentation] Large Spin Polarization in Si and the Spin Diffusion term observed in Co2FeSi/MgO/n+-Si on insulator devices (2017)
  • Author(s): A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka and Y. Saito
  • Organizer: 第42回応用物理学会学術講演会
  • Place of Presentation: 横浜(パシフィコ横浜)
  • Year and Date: 2017-03-14
• [Presentation] Spin accumulation and transport signals in CoFe/MgO/Si devices with confined structure of n+-Si layer (2016)
  • Author(s): Y. Saito, T. Inokuchi, M. Ishikawa, A. Tiwari, H. Sugiyama
  • Organizer: Proceedings of 61th annual Magnetism & Magnetic Materials Conference (MMM2016)
  • Place of Presentation: New Orleans, USA
  • Year and Date: 2016-10-31
  • Int'l Joint Research
• [Presentation] Room temperature observation of large spin accumulation and transport signals in post annealed Co2FeSi/MgO/n+-Si on insulator devices (2016)
  • Author(s): A. Tiwari, T. Inokuchi, M. Ishikawa, H. Sugiyama, N. Tezuka and Y. Saito
  • Organizer: Proceedings of 2016 International conference on solid state devices and materials (SSDM 2016)
  • Place of Presentation: Tsukuba (Tsukuba International Congress Center)
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] Spin injection, transport and detection technology in ferromagnet/MgO/Si devices (2016)
  • Author(s): Y. Saito, M. Ishikawa, T. Ajay, H. Sugiyama, T. Inokuchi
  • Organizer: 第40回日本磁気学会学術講演会
  • Place of Presentation: 金沢 (金沢大学)
  • Year and Date: 2016-09-07
  • Invited
• [Presentation] Relation between spin signal and atomic, electronic structures of interfaces for Co2FeAl0.5Si0.5/n-GaAs junctions (2016)
  • Author(s): Nobuki Tezuka, Tatsuya Saito, Masashi Matsuura and Satoshi Sugimoto
  • Organizer: 8th Joint European Magnetic Symposia
  • Place of Presentation: Glasgow, Schottland
  • Year and Date: 2016-08-22
  • Int'l Joint Research
• [Presentation] Spin accumulation signals in CoFe/MgO/n+-Si devices deposited on Si (1×1) and Si (2×1) surfaces (2016)
  • Author(s): Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Kohei Hamaya, Nobuki Tezuka
  • Organizer: Joint MMM/Intermag Conference
  • Place of Presentation: San Diego, USA
  • Year and Date: 2016-01-11
  • Int'l Joint Research
• [Presentation] Local Spin Signals in a Lateral Spin Transport Device With Co2Fe(Al,Si)/n-GaAs Schottky Tunnel Junctions (2016)
  • Author(s): Nobuki Tezuka, Tatsuya Saito, Masashi Matsuura and Satoshi Sugimoto
  • Organizer: Joint MMM/Intermag Conference
  • Place of Presentation: San Diego, USA
  • Year and Date: 2016-01-11
  • Int'l Joint Research
• [Presentation] Influence of Si surface on spin accumulation and transport signals in CoFe/MgO/n+-Si junctions (2015)
  • Author(s): Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Nobuki Tezuka, Kohei Hamaya, Yoshiaki Saito
  • Organizer: 2015 International conference on solid state devices and materials
  • Place of Presentation: Sapporo Convention Center, Sapporo, Japan
  • Year and Date: 2015-09-27
  • Int'l Joint Research
• [Presentation] Influence of miniaturization of the CoFe/MgO/n+-Si devices on magnitude of magnetoresistance (2015)
  • Author(s): Hideyuki Sugiyama, Mizue Ishikawa, Tomoaki Inokuchi, Yoshiaki Saito, Nobuki Tezuka
  • Organizer: International Colloquium on Magnetic Films and Surfaces 2015
  • Place of Presentation: Cracow, Poland
  • Year and Date: 2015-07-12
  • Int'l Joint Research
• [Presentation] Ferromagnet/tunnel barrier/n+-Si junction technology for spin-FETs (2015)
  • Author(s): Y. Saito, M. Ishikawa, T. Inokuchi, H. Sugiyama
  • Organizer: International Workshop on Junction Technology 2015
  • Place of Presentation: Kyoto Univ. Uji Campus, Kyoto, Japan
  • Year and Date: 2015-07-11
  • Int'l Joint Research / Invited
• [Presentation] Spin accumulation and transport signals in Heusler Co2FeSi/MgO/n+-Si on insulator devices (2015)
  • Author(s): Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Kohei Hamaya, Nobuki Tezuka
  • Organizer: 20th International conference on Magnetism
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] Temperature dependence of four terminal nonlocal spin signals with Co2FeAl0.5Si0.5/n-GaAs Shottoky tunnel junctions (2015)
  • Author(s): Nobuki Tezuka, Tatsuya Saito, Masashi Matsuura and Satoshi Sugimoto
  • Organizer: 20th International conference on Magnetism
  • Place of Presentation: Barcelona, Spain
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] Correlation between amplitude of spin accumulation signals investigated by Hanle effect measurement and effective junction barrier height in CoFe/MgO/n+-Si junctions (2014)
  • Author(s): Yoshiaki Saito, Mizue Ishikawa, Tetsufumi Tanamoto, Tomoaki Inokuchi, Hideyuki Sugiyama, Kohei Hamaya, Nobuki Tezuka
  • Organizer: 59th annual Magnetism & Magnetic Materials Conference (MMM2014)
  • Place of Presentation: Hilton Hawaiian Village Conference Center, Honolulu, Hawaii, USA
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Influence of interface roughness in CoFe/MgO/n+-Si junctions on spin accumulation and spin transport signals (2014)
  • Author(s): Mizue Ishikawa, Hideyuki Sugiyama, Tomoaki Inokuchi, Tetsufumi Tanamoto, Kohei Hamaya, Nobuki Tezuka and Yoshiaki Saito
  • Organizer: 59th annual Magnetism & Magnetic Materials Conference (MMM2014)
  • Place of Presentation: Hilton Hawaiian Village Conference Center, Honolulu, Hawaii, USA
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Atomic and Electronic Structures of Interfaces for Co2FeAl0.5Si0.5/n-GaAs Junctions (2014)
  • Author(s): N. Tezuka, T. Saito, M. Matsuura, S. Sugimoto
  • Organizer: 59th Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Hilton Hawaiian Village Conference Center, Honolulu, USA
  • Year and Date: 2014-11-03 – 2014-11-07
• [Presentation] Co2Fe(Al,Si)/n-GaAs接合における非局所スピンシグナル (2014)
  • Author(s): 手束展規，斎藤達哉，及川楓吾，松浦昌志，杉本諭
  • Organizer: 第75回 応用物理学会秋季学術講演会
  • Place of Presentation: 北海道大学、札幌
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] Temperature dependence of spin signals for Co2FeAl0.5Si0.5/n-GaAs junctions by four terminal nonlocal measurements (2014)
  • Author(s): N. Tezuka, T. Saito, M. Matsuura, S. Sugimoto
  • Organizer: International Union of Materials Research Societies-The IUMRS International Conference in Asia 2014
  • Place of Presentation: Fukuoka University, Fukuoka, Japan
  • Year and Date: 2014-08-24 – 2014-08-30
• [Presentation] Spin injection, detection and local magnetoresistance through Si at room temperature in ferrmagnet/MgO/Si lateral spin valves (2014)
  • Author(s): Y. Saito, M. Ishikawa, T. Inokuchi, H. Sugiyama, T. Tanamoto, N. Tezuka, K. Hamaya,
  • Organizer: IEEE International nanoelectronics conference, 2014 (IEEE INEC 2014)
  • Place of Presentation: Hokkaido univ., Sapporo, Japan
  • Year and Date: 2014-07-28 – 2014-07-31
  • Invited
• [Presentation] STRUCTURAL, MAGNETIC AND ELECTRIC TRANSPORT PROPERTIES FOR Co2FeAl0.5Si0.5/n-GaAs JUNCTIONS (2014)
  • Author(s): N. Tezuka, T. Saito, M. Matsuura and S. Sugimoto
  • Organizer: Moscow International Symposium on Magnetism MISM-2014
  • Place of Presentation: Lomonosov Moscow State University, Moscow, Russia
  • Year and Date: 2014-06-29 – 2014-07-03
• [Presentation] Siへのスピン注入とスピン伝導 ―スピンMOSトランジスタの実現を目指して― (2014)
  • Author(s): 斉藤 好昭，石川瑞恵，井口智明，杉山英行，棚本哲史，手束展規，浜屋宏平
  • Organizer: 第49回日本磁気学会スピンエレクトロニクス専門委員会
  • Place of Presentation: 京都大学、京都
  • Year and Date: 2014-05-26
• [Presentation] Comparison of Spin Signals Between 3T Hanle and 4T Non-Local Methods for Co2Fe(Al,Si)/n-GaAs Junctions (2014)
  • Author(s): N. Tezuka, T. Saito, M. Matsuura, S. Sugimoto
  • Organizer: IEEE International Magnetics Conference, INTERMAG Europe 2014
  • Place of Presentation: International Congress Center Dresden, Dressden, Germany
  • Year and Date: 2014-05-04 – 2014-05-08