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Study of photoexcitation effect of vacancy-induced magnetism by spin-polarized positron annihilation method

Research Project

Project/Area Number 18K04931
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionNational Institutes for Quantum and Radiological Science and Technology

Principal Investigator

Maekawa Masaki  国立研究開発法人量子科学技術研究開発機構, 高崎量子応用研究所 先端機能材料研究部, 主幹研究員(定常) (10354945)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords陽電子消滅 / 空孔誘起磁性 / スピン偏極陽電子 / イオンビーム照射 / d0強磁性 / カチオン原子空孔 / 窒化ガリウム / ガドリニウム注入 / 酸化亜鉛 / 原子空孔 / 半導体物性 / 磁性制御
Outline of Final Research Achievements

The spin-polarized positron annihilation method, which has high sensitivity for the electron spins associated with atomic vacancies, was used to validate the theory that cation vacancies are the origin of vacancy-induced magnetism. The strong magnetization predicted to be induced in gallium nitride (GaN) and its control by the UV light illumination was investigated. No significant excess spin was observed at the single gallium vacancies (cation vacancies) in nitrogen-implanted GaN, however, magnetization induced at vacancy clusters was detected in Gadolinium-implanted GaN. It was clarified that vacancy-induced magnetism is also induced in defect structures other than single vacancy.

Academic Significance and Societal Importance of the Research Achievements

空孔誘起磁性は、半導体デバイスの極省電力化が期待されるスピントロニクス材料開発において注目されている現象であるが、肝心の空孔と磁性の関係はほとんど明らかになっていない。その理由の一つとして、空孔に誘起したスピンを高感度に測定できる手法が存在しなかった事がある。スピン偏極陽電子消滅(SP-PAS)法はそのような要請に答えうる現在唯一の方法といえる。本研究ではSP-PAS法を用いて、空孔誘起磁性の礎となっているカチオン原子空孔説の予測を検証し、より強い磁性発現への道を探った。本研究ではこれまであまり注目されてこなかった空孔クラスターの磁性への関与を明らかにし、今後の材料開発の発展に寄与した。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (16 results)

All 2021 2020 2019 2018

All Journal Article (8 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Vacancy-induced Magnetism in Gd-doped GaN film probed by spin-polarized positron beam2021

    • Author(s)
      M. Maekawa, S. Sakai, A. Miyashita and A. Kawasuso
    • Journal Title

      QST-Takasaki annual report 2019

      Volume: QST-M-29 Pages: 45-45

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Gadolinium-implanted GaN studied by spin-polarized positron annihilation spectroscopy2020

    • Author(s)
      Maekawa M.、Miyashita A.、Sakai S.、Kawasuso A.
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 5 Pages: 054427-054427

    • DOI

      10.1103/physrevb.102.054427

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Development a new positron source for spin-polarized positron beam generation2020

    • Author(s)
      M. Maekawa, K. Wada, A. Kawasuso
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 480 Pages: 49-55

    • DOI

      10.1016/j.nimb.2020.08.001

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Vacancy-induced magnetism in Gd-doped GaN film probed by spin-polarized positron beam2020

    • Author(s)
      M. Maekawa, S. Sakai, K. Wada, A. Miyashita and A. Kawasuso
    • Journal Title

      QST-Takasaki annual report 2018

      Volume: QST-M-23 Pages: 106-106

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic Doppler broadening measurement on Gadolinium-doped GaN2019

    • Author(s)
      Maekawa M.、Sakai S.、Hagiwara S.、Miyashita A.、Wada K.、Kawasuso A.、Yabuuchi A.、Hasegawa S.
    • Journal Title

      AIP Conference Proceedings

      Volume: 2182 Pages: 050007-050007

    • DOI

      10.1063/1.5135850

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Vacancy-induced magnetism in GaN film probed by spin-polarized positron beam2019

    • Author(s)
      M. Maekawa, S. Sakai, K. Wada, A. Miyashita and A. Kawasuso
    • Journal Title

      QST-Takasaki annual report 2017

      Volume: QST-M-16 Pages: 125-125

    • NAID

      130006710563

    • Related Report
      2018 Research-status Report
  • [Journal Article] Spin-Polarized Positron Annihilation Measurement on Ga Vacancies in p-type GaN2018

    • Author(s)
      Maekawa Masaki、Sakai Seiji、Miyashita Atsumi、Kawasuso Atsuo
    • Journal Title

      e-Journal of Surface Science and Nanotechnology

      Volume: 16 Issue: 0 Pages: 347-350

    • DOI

      10.1380/ejssnt.2018.347

    • NAID

      130007420683

    • ISSN
      1348-0391
    • Year and Date
      2018-07-28
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spin-polarized positron beams with 22Na and 68Ge and their applications to materials research2018

    • Author(s)
      Wada K.、Miyashita A.、Maekawa M.、Sakai S.、Kawasuso A.
    • Journal Title

      AIP Conference Proceedings

      Volume: 1970 Pages: 040001-040001

    • DOI

      10.1063/1.5040213

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] スピン偏極陽電子消滅法によるガドリニウム注入窒化ガリウム薄膜の空孔誘起電子スピン評価2021

    • Author(s)
      前川雅樹、宮下敦巳、河裾厚男
    • Organizer
      QST高崎サイエンスフェスタ 2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] 陽電子消滅法によるスピントロニクス材料評価2021

    • Author(s)
      前川雅樹
    • Organizer
      第641回高崎研オープンセミナー(リサーチ)
    • Related Report
      2020 Annual Research Report
  • [Presentation] スピン偏極陽電子ビームを用いた磁性元素添加半導体材料の空孔誘起磁性評価2019

    • Author(s)
      前川雅樹、境誠司、和田健、宮下敦巳、河裾厚男
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 前川雅樹、境誠司、和田健、宮下敦巳、河裾厚男2019

    • Author(s)
      スピン偏極陽電子ビームによるガドリニウムイオン照射窒化ガリウム薄膜の空孔局在電子スピン評価
    • Organizer
      QST高崎サイエンスフェスタ2019
    • Related Report
      2019 Research-status Report
  • [Presentation] スピン偏極陽電子ビームを用いた金属酸化物・窒化物の空孔誘起磁性検出2018

    • Author(s)
      前川 雅樹, 和田 健, 萩原 聡, 宮下 敦巳, 境 誠司, 河裾 厚男
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] スピン偏極陽電子ビームを用いたガドリニウム添加窒化ガリウム薄膜の空孔誘起磁性検出2018

    • Author(s)
      前川 雅樹, 境 誠司, 萩原 聡, 和田 健, 宮下 敦巳, 河裾 厚男, 薮内 敦, 長谷川 繁彦
    • Organizer
      日本物理学会参加(2018年秋季大会)
    • Related Report
      2018 Research-status Report
  • [Presentation] スピン偏極陽電子ビームによるイオン照射窒化ガリウム薄膜の空孔局在電子スピン評価2018

    • Author(s)
      前川 雅樹, 和田 健, 萩原 聡, 宮下 敦巳, 境 誠司, 河裾 厚男
    • Organizer
      QST 高崎サイエンスフェスタ
    • Related Report
      2018 Research-status Report
  • [Presentation] Magnetic Doppler Broadening Measurement on Gadolinium-doped GaN2018

    • Author(s)
      前川 雅樹, 境 誠司, 和田 健, 宮下 敦巳, 薮内 敦, 長谷川繁彦
    • Organizer
      18th International Conference on Positron Annihilation
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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