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Experimental Exploration of the Superconducting Edelstein Effect Utilizing Unidirectional Interfacial Spin Currents

Research Project

Project/Area Number 22K18695
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionShizuoka University

Principal Investigator

Hirobe Daichi  静岡大学, 理学部, 助教 (70823235)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2023: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2022: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywordsキラリティ / Chirality / Spin polarization / 電流誘起スピン偏極
Outline of Research at the Start

磁気抵抗デバイスを用いて、超伝導体による電荷-スピン相互変換現象を実験的に開拓します。超伝導研究へ接合界面でのスピントロニクス効果を導入することで、理論的予言を検証します。本研究の完遂は、たとえば磁化反転による情報書き込みの消費電力の飛躍的な低減に道をつけるものであり、超低消費電力を標榜するスピントロニクスの希求するに資すると期待できます。

Outline of Final Research Achievements

In conductors with broken inversion symmetry, the coupling between electron angular momentum and momentum results in current-induced angular momentum polarization. In this study, we attempted to detect this phenomenon based on the unidirectional interfacial spin currents expected from the broken inversion symmetry. Using magnetoresistance devices, we observed spin-dependent magnetoresistance at the superconducting/ferromagnetic junction interface. A comparison of the experimental results with theoretical predictions revealed the potential involvement of unconventional nonlinear spin transport. Additionally, we investigated the possibility of unconventional nonlinear electrical conduction, demonstrating that orbital magnetic moments can give rise to unique transport phenomena.

Academic Significance and Societal Importance of the Research Achievements

本研究の完遂は、超伝導体を用いた電気-スピン変換に立脚する超伝導スピントロニクスの発展に寄与するものである。また、本実験の検出原理は超伝導Edelstein効果に限定されるものではなく、スピン三重項Cooper対を選択的に検出する方法論の可能性も示唆しており、関連する実験及び理論研究にも波及効果を有する。他方、軌道磁気モーメントが誘発する特異な電気伝導は、相対論的補正としてのスピン軌道結合を必要としない。したがって、軽元素のみを用いて引き出すことが原理的には可能であり、物質群のさらなる拡張が期待される。

Report

(2 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (4 results)

All 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (2 results) (of which Invited: 1 results)

  • [Journal Article] Giant spin polarization and a pair of antiparallel spins in a chiral superconductor2023

    • Author(s)
      Nakajima R.、Hirobe D.、Kawaguchi G.、Nabei Y.、Sato T.、Narushima T.、Okamoto H.、Yamamoto H. M.
    • Journal Title

      Nature

      Volume: 613 Issue: 7944 Pages: 479-484

    • DOI

      10.1038/s41586-022-05589-x

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Chirality-induced intrinsic charge rectification in a tellurium-based field-effect transistor2022

    • Author(s)
      Hirobe Daichi、Nabei Yoji、Yamamoto Hiroshi M.
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 22

    • DOI

      10.1103/physrevb.106.l220403

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] A Pair of Antiparallel Spin Polarizations in a Chiral Organic Superconductor2023

    • Author(s)
      D. Hirobe
    • Organizer
      Trends in Topological Materials Science and beyond
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Chirality-induced intrinsic charge rectification in a tellurium-based field-effect transistor2022

    • Author(s)
      広部大地
    • Organizer
      ISSPワークショップ
    • Related Report
      2022 Research-status Report

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Published: 2022-07-05   Modified: 2025-01-30  

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