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Spin-polarized supercurrent induced by effective spin injection

Research Project

Project/Area Number 17K14109
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied materials
Research InstitutionKyushu University

Principal Investigator

Ohnishi Kohei  九州大学, 理学研究院, 助教 (30722293)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsスピン流 / 超伝導 / トリプレットクーパー対 / スピン偏極超伝導電流 / スピントロニクス / スピン依存伝導 / 超伝導体 / スピン注入 / メゾスコピック系 / 超伝導材料・素子 / 物性実験
Outline of Final Research Achievements

In this research, a generator and a detector of spin-polarized supercurrent have been demonstrated by investiging micro-fabricated multi-layers under spin injection. (1) The spin current can be an efficient detector for the superconducting state especially at the normal metal / superconductor interface. (2) A comparison of the spin injections into Nb and NbN can be explained by a simple model of superconducting gap at the interface just below the transition temperature. (3) Several structures for spin absorption show the temperature- and structure-dependent spin signals, which indicates the spin polarized supercurrent may be detected in these structures. (4) Based on the discussion with the theoretical groups, new ways to control spin-polarized supercurrent have been provided.

Academic Significance and Societal Importance of the Research Achievements

これまでスピン偏極超伝導電流の形成は、限られたトリプレット超伝導体や特定の試料構造においてのみ観測されてきた。本研究の成果により、より自由度の高い試料構造が可能となり、クーパー対の変調やスピン偏極超伝導電流の形成に関する物性値の測定が容易となった。今後、これらの研究成果を踏まえることにより、様々な方法を用いてスピン偏極超伝導電流の生成を制御可能となり、超伝導位相制御素子等を含めた新たな超伝導スピントロニクスの提案へと広がりをもつ。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (23 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (10 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 10 results,  Open Access: 3 results) Presentation (12 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

  • [Int'l Joint Research] University of Cambridge(英国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Spin-transport in superconductors2020

    • Author(s)
      Ohnishi K.、Komori S.、Yang G.、Jeon K.-R.、Olde Olthof L. A. B.、 Montiel X.、Blamire M. G.、Robinson J. W. A.
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 13 Pages: 130501-130501

    • DOI

      10.1063/1.5138905

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin-orbit torque-driven current-induced domain wall motion in Gd-Fe magnetic wires2019

    • Author(s)
      Kurokawa Yuichiro、Wakae Masakazu、Sumi Satoshi、Awano Hiroyuki、Ohnishi Kohei、Yuasa Hiromi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 58 Issue: 3 Pages: 030905-030905

    • DOI

      10.7567/1347-4065/aafa91

    • NAID

      210000135321

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermal Spin-Valve Effect in Magnetic Multi-layered Nanowires2019

    • Author(s)
      N. Asam, K. Yamanoi, K. Ohnishi and T. Kimura
    • Journal Title

      Journal of Superconductivity and Novel Magnetism

      Volume: 1 Issue: 10 Pages: 1-5

    • DOI

      10.1007/s10948-019-5016-5

    • Related Report
      2019 Annual Research Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bolometric ferromagnetic resonance techniques for characterising spin-Hall effect at high temperatures2019

    • Author(s)
      P. Phu, K. Yamanoi, K. Ohnishi, J. Hyodo, K. Rogdakis, Y. Yamazaki, T. Kimura, H. Kurebayashi
    • Journal Title

      Journal of Magnetism and Magnetic Materials

      Volume: 485 Pages: 304-307

    • DOI

      10.1016/j.jmmm.2019.04.070

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quasi-antiferromagnetic multilayer stacks with 90 degree coupling mediated by thin Fe oxide spacers2019

    • Author(s)
      G. Nagashima, Y. Kurokawa, Y. Zhong, S. Horiike, D. Schonke, P. Krautscheid, R. Reeve, M. Kl&aui, Y. Inagaki, T. Kawae, T. Tanaka, K. Matsuyama, K. Ohnishi, T. Kimura, and H. Yuasa
    • Journal Title

      J. Appl. Phys.

      Volume: 126 Issue: 9 Pages: 093901-093901

    • DOI

      10.1063/1.5117869

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Possibility of Cooper-pair formation controlled by multi-terminal spin injection2018

    • Author(s)
      Ohnishi Kohei、Sakamoto Michiko、Ishitaki Masayuki、Kimura Takashi
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 969 Pages: 012028-012028

    • DOI

      10.1088/1742-6596/969/1/012028

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temperature evolution of the charge and spin transport in Cu/Nb interface2018

    • Author(s)
      Ishitaki Masayuki、Ohnishi Kohei、Kimura Takashi
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 57 Issue: 6 Pages: 060310-060310

    • DOI

      10.7567/jjap.57.060310

    • NAID

      210000149103

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Substantial enhancement of thermal spin polarization in Py/Cu interface2018

    • Author(s)
      Hu Shaojie、Zhao Jingyan、Wang Lei、Cui Xiaomin、Ohnishi Kohei、Ariki Taisei、Min Tai、Xia Ke、Kimura Takashi
    • Journal Title

      Physical Review Materials

      Volume: 2 Issue: 10 Pages: 104403-104403

    • DOI

      10.1103/physrevmaterials.2.104403

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Possibility of Cooper-pair formation controlled by multi-terminal spin injection2018

    • Author(s)
      K. Ohnishi, M. Sakamoto, M. Ishitaki, and T. Kimura
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temperature evolution of the charge and spin transport in Cu/Nb interface2018

    • Author(s)
      M. Ishitaki, K. Ohnishi, T. Kimura
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 印刷中

    • NAID

      210000149103

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Transport properties in submicron Nb superconducting wire with ferromagnetic electrode2020

    • Author(s)
      K. Ohnishi, T. Iwahori, D. Yano, and T. Kimura
    • Organizer
      New Perspective in Spin Conversion Science (NPSCS) 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Non-local spin transport in superconductor/ferromagnet hybrid lateral structures2020

    • Author(s)
      K. Ohnishi, and T. Kimura
    • Organizer
      7th International Conference on Superconductivity and Magnetism (ICSM2020)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Experimental demonstration of a Josephson junction under spin current injection2019

    • Author(s)
      Kohei Ohnishi
    • Organizer
      EPSRC-OSS meeting
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Nb系超伝導細線における電荷およびスピン不均衡状態の観測2019

    • Author(s)
      大西紘平,矢野大吾,木村崇
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Spin-dependent quasi-particles injection into superconducting Nb2019

    • Author(s)
      大西紘平,矢野大吾,木村崇
    • Organizer
      平成30年度 スピン変換年次報告会
    • Related Report
      2018 Research-status Report
  • [Presentation] Experimental demonstration of a Josephson junction under spin current injection2018

    • Author(s)
      Kohei Ohnishi
    • Organizer
      Superconducting Spintronics Mini Conference
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 超伝導体/常伝導体界面におけるスピン流2018

    • Author(s)
      大西紘平,木村崇
    • Organizer
      IEEEマグネティクス 福岡/広島ジョイントチャプタ キックオフセミナー
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 超伝導体/磁性体界へのスピン注入2018

    • Author(s)
      大西紘平,石瀧真之,矢野大吾,木村崇
    • Organizer
      第11回 物性科学領域横断研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] 超伝導体NbN/常伝導体Cu界面におけるスピン吸収の温度依存性2018

    • Author(s)
      大西紘平,矢野大吾,石瀧真之,木村崇
    • Organizer
      日本物理学会 第73回年次大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Possibility of Cooper-pair formation controlled by multi-terminal spin injection2017

    • Author(s)
      K. Ohnishi, M. Sakamoto, M. Ishitaki, and T. Kimura
    • Organizer
      28th International Conference on Low Temperature Physics (LT28)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spin injection into proximity-induced superconducting Cu film2017

    • Author(s)
      大西紘平,石瀧真之,木村崇
    • Organizer
      平成29年度「ナノスピン変換科学」研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] 超伝導体/常伝導体界面におけるスピン伝導特性2017

    • Author(s)
      大西紘平
    • Organizer
      日本物理学会 2017年秋季大会
    • Related Report
      2017 Research-status Report
    • Invited

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Published: 2017-04-28   Modified: 2021-02-19  

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