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Exploration of spin transport in insulators

Research Project

Project/Area Number 19K22131
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 29:Applied condensed matter physics and related fields
Research InstitutionKeio University

Principal Investigator

ANDO KAZUYA  慶應義塾大学, 理工学部(矢上), 准教授 (30579610)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2019: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Keywordsマグノン / スピントロニクス
Outline of Research at the Start

本研究は、非線形スピントロニクス現象を用いた精密スピン流伝導測定により、反強磁性絶縁体中スピン流伝導を切り拓くものである。スピントロニクスの基盤は物質中のスピン伝導である。しかし、磁性絶縁体の一般的基底状態である反強磁性状態におけるマグノンスピン流伝導の微視的機構は現時点で殆ど未解明である。本研究では、波数ベクトル・エネルギーを制御したマグノンスピン流の精密測定により、反強磁性体中スピン流伝導物性を明らかにする。

Outline of Final Research Achievements

One of the important challenges to understand the spin transport in magnetic insulators is to clarify the magnon wavenumber and energy dependence of the spin injection into antiferromagnetic insulators. In this study, we measured the interfacial spin exchange and spin transport in a ferrimagnetic-insulator/antiferromagnetic-insulator junction by using a nonlinear spintronics phenomenon. We found that magnons with large wavenumbers can effectively inject spins into the antiferromagnetic insulator. This result illustrates an important role of the interfacial exchange bias in the spin current injection into antiferromagnetic insulators.

Academic Significance and Societal Importance of the Research Achievements

電荷の流れである電流が金属及び半導体中のみ伝導するのに対し、スピン角運動量の流れであるスピン流は、金属・半導体だけでなく、スピン系の素励起、マグノンによって絶縁体中さえ伝導する。しかし、磁性絶縁体の一般的基底状態である反強磁性状態におけるマグノンスピン流伝導の微視的機構は明らかでなかった。今回の研究により、反強磁性絶縁体へのスピン流注入を実現する最も典型的な構造である、強磁性/反強磁性絶縁体ヘテロ構造におけるスピン注入及びスピン伝導のマグノン波数依存性が初めて明らかになった。これは、反強磁性体絶縁体ベースのスピントロニクスにおける重要な知見である。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (1 results)

  • [Journal Article] Study of spin mixing conductance of single oriented Pt in Pt/Ni81Fe19 heterostructure by spin pumping2021

    • Author(s)
      You Yunfeng、Sakimura Hiroto、Harumoto Takashi、Nakamura Yoshio、Shi Ji、Song Cheng、Pan Feng、Ando Kazuya
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 3 Pages: 035211-035211

    • DOI

      10.1063/5.0035912

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spin-orbit torques originating from the bulk and interface in Pt-based structures2021

    • Author(s)
      Hayashi Hiroki、Musha Akira、Sakimura Hiroto、Ando Kazuya
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 1 Pages: 013042-013042

    • DOI

      10.1103/physrevresearch.3.013042

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Role of interfacial oxidation in the generation of spin-orbit torques2020

    • Author(s)
      Haku Satoshi、Musha Akira、Gao Tenghua、Ando Kazuya
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 2 Pages: 024405-024405

    • DOI

      10.1103/physrevb.102.024405

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Manipulation of perpendicular exchange bias and spin-orbit torques via MgO in Pt/Co/MgO films2020

    • Author(s)
      Chen Zhiren、Pan Chunjiao、Wang Ning、Qiu Mingxia、Lin Tao、Liu Jing、Li Shunpu、Han Peigang、Shi Ji、Ando Kazuya、An Hongyu
    • Journal Title

      Journal of Magnetism and Magnetic Materials

      Volume: 507 Pages: 166822-166822

    • DOI

      10.1016/j.jmmm.2020.166822

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Parametric spin pumping into an antiferromagnetic insulator2019

    • Author(s)
      Numata Taiki、Hayashi Hiroki、Sakimura Hiroto、Ando Kazuya
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 14

    • DOI

      10.1103/physrevb.100.144430

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Anomalous Hall effect at a PtOx/Co interface2019

    • Author(s)
      Hayashi Hiroki、Asami Akio、Ando Kazuya
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 21

    • DOI

      10.1103/physrevb.100.214415

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Intrinsic Spin Decay Length in Antiferromagnetic Insulator2019

    • Author(s)
      Hiroto Sakimura, Akio Asami, Hiroki Hayashi, Ji Shi, and Kazuya Ando
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2022-01-27  

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