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Development of evaluation method for thin film magnetism by spin Hall magnetoresistance

Research Project

Project/Area Number 21K20497
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
Research InstitutionTohoku University

Principal Investigator

Masamichi Negishi  東北大学, 金属材料研究所, 特任助教 (70911147)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords磁性体薄膜 / 反強磁性 / 常磁性 / イルメナイト型構造 / チタン酸化物 / イリジウム酸化物 / 薄膜合成 / 酸化物 / パルスレーザー堆積法 / 磁性 / 薄膜 / イルメナイト / スピン輸送現象
Outline of Research at the Start

スピンホール磁気抵抗効果という、界面付近の磁気状態を電気信号に変換できる物理現象を利用して、反強磁性体薄膜の評価を行う。異なる反強磁性秩序を持つイルメナイト型酸化物群でスピンホール磁気抵抗効果を比較することによって、スピンホール磁気抵抗効果を薄膜磁性評価のプローブとして確立する。薄膜系での反強磁性体研究を可能にすることによって、物性変調自由度の高い薄膜・人工超格子系での新奇量子磁性探究の可能性を開拓する。

Outline of Final Research Achievements

In this project, thin films of ilmenite-type non-magnetic MgTiO3 and antiferromagnetic ATiO3 (A = Mn, Fe, Co, Ni) were synthesized. For all materials, crystalline thin films whose crystalline orientation is aligned along the out-of-plane direction were obtained. For MgTiO3 and MnTiO3, conditions of deposition of thin film were optimized and twin-suppressed single-crystalline thin films of the ilmenite phases were formed. In addition, Mg-Ir-O films were deposited with the aim to form another ilmenite-type magnet. In that process, a method to control Mg/Ir composition ratio in thin films was developed.

Academic Significance and Societal Importance of the Research Achievements

薄膜において常磁性や反強磁性などの磁気状態を判別することは、学術・応用両面において重要な課題である。しかし、これらの磁気状態では磁場に対する応答が小さいため、微小体積の薄膜において、これらの磁気状態を区別することが難しい。本研究では、薄膜で発現する常磁性や反強磁性を電気伝導測定によって判別する方法を開発する際に参照物質となる、同型の結晶構造をもった非磁性体・反強磁性体薄膜試料群を合成した。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (5 results)

All 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Composition tuning of Mg/Ir ratio and crystallization of a spinel-related structure in Mg-Ir-O films by pulsed-laser deposition2023

    • Author(s)
      Negishi Masamichi, Fujiwara Kohei, Tsukazaki Atsushi
    • Journal Title

      Thin Solid Films

      Volume: 769 Pages: 139740-139740

    • DOI

      10.1016/j.tsf.2023.139740

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Mg-Ir-O薄膜のパルスレーザー堆積におけるレーザーフルーエンスによる組成調整と新規スピネル型結晶相の形成2023

    • Author(s)
      根岸真通, 藤原宏平, 塚﨑敦
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Pulsed-laser deposition of single-crystalline ilmenite MgTiO3 thin films2022

    • Author(s)
      M. Negishi, K. Fujiwara, A. Tsukazaki
    • Organizer
      Summit of Materials Science 2022 & GIMRT User Meeting 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] イルメナイト型MgTiO3薄膜のパルスレーザー堆積法による合成2022

    • Author(s)
      根岸真通, 藤原宏平, 塚﨑敦
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Approach to Kitaev Magnetism in Ilmenite-Based Superlattices using Spin Hall Magnetoresistance2021

    • Author(s)
      Masamichi Negishi, Kei Miura, Kohei Fujiwara, Kei Nakayama, Ryo Ishikawa, Naoya Shibata, Atsushi Tsukazaki
    • Organizer
      The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics, and the 4th Symposium on International Joint Graduate Program in Materials Science
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-10-22   Modified: 2024-01-30  

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