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Time-resolved SP-STM study of spin dynamics in ferromagnetic nanostructures

Research Project

Project/Area Number 17H02779
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionTohoku University

Principal Investigator

Oka Hirofumi  東北大学, 材料科学高等研究所, 助教 (70374600)

Co-Investigator(Kenkyū-buntansha) 米田 忠弘  東北大学, 多元物質科学研究所, 教授 (30312234)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Keywords強磁性ナノ構造 / スピン偏極STM / スピン緩和時間 / 時間分解測定 / Coナノ構造 / 非弾性トンネル分光 / ナノ構造 / 電圧ポンプ・プローブ
Outline of Final Research Achievements

In order to investigate spin relaxation processes in ferromagnetic nanostructures, we established nanostructures with simple spin-dependent electronic states and spin-polarized scanning tunneling microscopy (STM) with temporal resolution.
Co nanostructures with triangular shape were formed on Cu(111) substrate, followed by sequential deposition of Fe, Ni, or Ag. This procedure resulted in the formation of a core-shell type of nanostructures that Co was surrounded by other materials. Spin-polarized STM measurements revealed that Co nanostructures exhibited two free-electron like spin-polarized surface states. Analyses on the energy width of discrete free-electron like states implied that the spin relaxation time was longer for core-shell type nanostructures than for pure Co nanostructures.

Academic Significance and Societal Importance of the Research Achievements

強磁性ナノ構造における電子スピンの緩和過程を明らかにすることは、電子のスピン状態の保持・伝達につながり、スピン状態の制御を可能にするため、新規スピントロニクスデバイスの創出に向けて重要な課題である。単純なスピン偏極電子状態を示す強磁性Coナノ構造はその測定対象のモデルケースとなり得、他の材料で囲むことによりスピン間時間を変調できる可能性を示した。今後、時間分解測定のナノ構造内での局所測定につなげていく。

Report

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

    (17 results)

All 2020 2019 2018 2017

All Journal Article (4 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 7 results,  Invited: 4 results)

  • [Journal Article] Magnetic Hysteresis of Single-Molecule Magnets Adsorbed on Ferromagnetic Substrate2019

    • Author(s)
      Qi Zhi Kun、Mishra Puneet、Ara Ferdous、Oka Hirofumi、Sainoo Yasuyuki、Katoh Keiichi、Yamashita Masahiro、Komeda Tadahiro
    • Journal Title

      ACS Nano

      Volume: in press Issue: 11 Pages: 1-10

    • DOI

      10.1021/acsnano.9b04428

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spin properties of single-molecule magnet of double-decker Tb(III)-phthalocyanine (TbPc2) on ferromagnetic Co film characterized by spin polarized STM (SP-STM)2019

    • Author(s)
      F. Ara, H. Oka, Y. Sainoo, K. Katoh, M. Yamashita, and T. Komeda
    • Journal Title

      Journal of Applied Physics

      Volume: 125 Issue: 18 Pages: 183901-183901

    • DOI

      10.1063/1.5079964

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Two distinct surface terminations of SrVO3 (001) ultrathin films as an influential factor on metallicity2018

    • Author(s)
      Oka Hirofumi、Okada Yoshinori、Hitosugi Taro、Fukumura Tomoteru
    • Journal Title

      Applied Physics Letters

      Volume: 113 Issue: 17 Pages: 171601-171601

    • DOI

      10.1063/1.5051434

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spatially Resolved Magnetic Anisotropy of Cobalt Nanostructures on the Au(111) Surface2017

    • Author(s)
      P. Mishra, Z. K. Qi, H. Oka, K. Nakamura, T. Komeda
    • Journal Title

      Nano Letters

      Volume: 17 Issue: 9 Pages: 5843-5847

    • DOI

      10.1021/acs.nanolett.7b03114

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] Spatially resolved magnetic anisotropy of Co nanostructures2020

    • Author(s)
      Hirofumi Oka
    • Organizer
      Tohoku University GP-Spin seminar 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Local structures and electronic properties of single molecule magnets TbPc2 on SrVO3(001)2019

    • Author(s)
      Hirofumi Oka, Keiichi Katoh, Masahiro Yamashita, and Tomoteru Fukumura
    • Organizer
      12th International Symposium on Atomic Level Characterizations for New Materials and Devices '19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] STM/STS study of single molecule magnets TbPc2 on SrVO3(001)2019

    • Author(s)
      Hirofumi Oka, Keiichi Katoh, Masahiro Yamashita, and Tomoteru Fukumura
    • Organizer
      IBS Conference on Quantum Nanoscience
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] コア-シェル型Co-Niナノ構造における電子定在波の形成2019

    • Author(s)
      岡 博文、米田忠弘
    • Organizer
      2019年日本物理学会秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] スピン偏極STMによるナノスケール磁気特性の開拓2019

    • Author(s)
      岡 博文
    • Organizer
      日本磁気学会研究会「走査型トンネル顕微鏡/分光法を活用した物性研究の新展開」
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Spatially resolved magnetic anisotropy of Co islands on Au(111)2018

    • Author(s)
      Hirofumi Oka, Puneet Mishra, Zhi-Kun Qi, Komeda Tadahiro
    • Organizer
      2018 International Conference on Nanoscience + Technology (ICN+T)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spatially resolved magnetic anisotropy of Co islands on Au(111)2018

    • Author(s)
      Hirofumi Oka, Puneet Mishra, Zhi-Kun Qi, Komeda Tadahiro
    • Organizer
      SPSTM-7 & LTSPM-1 International Conference 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coアイランドの磁気異方性エネルギーの膜厚依存性2018

    • Author(s)
      岡 博文、Mishra Puneet、Qi Zhi-Kun、米田忠弘
    • Organizer
      2018年日本表面真空学会学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Coナノ磁石の磁気特性:スピン偏極STMによる研究2018

    • Author(s)
      岡 博文
    • Organizer
      顕微鏡学会研究会「超高空間分解能SPMの最前線」
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Spin-resolved dispersion relation of a single Co island2018

    • Author(s)
      Hirofumi Oka, Tadahiro Komeda
    • Organizer
      DPG Spring Meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin-dependent electron scattering in a single Co island2017

    • Author(s)
      Hirofumi Oka
    • Organizer
      Advanced Scanning Probe Microscopy 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Coナノ構造におけるスピン依存散乱2017

    • Author(s)
      岡 博文, 米田忠弘
    • Organizer
      日本物理学会2017年秋季大会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 強磁性Coナノ構造の磁気異方性エネルギー:スピン偏極STMによる局所測定2017

    • Author(s)
      岡 博文
    • Organizer
      物質・デバイス領域共同研究拠点 展開共同研究B研究会
    • Related Report
      2017 Annual Research Report
    • Invited

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

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