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Controlling magnetic moments of single molecular magnets via interlayer magnetic interaction

Research Project

Project/Area Number 21H01803
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
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) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2022: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2021: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Keywords層間磁気結合 / 単分子磁石 / スピン偏極STM / TbPc2 / Coアイランド
Outline of Research at the Start

「単分子磁石」は1つの分子で1つの磁石として振る舞うため、磁石の方向をそれぞれ「0」と「1」に対応させることにより、分子サイズのスピンメモリ・究極の高密度磁気記録を実現できる可能性があり、大きな注目を集めている。本研究は、単分子磁石がもつ磁石の方向を、基板との「層間磁気結合」を介して制御することを目的とする。スピン偏極走査トンネル顕微鏡により、分子1つ1つの磁気特性を明らかにし、狙った1つの単分子磁石の方向を反転・制御することに取り組む。

Outline of Final Research Achievements

The Goal of this project is to establish the way to controlling the magnetic interaction between single magnetic molecules and magnetic substrates via interlayer exchange coupling, which has been often utilized in ferromagnetic/non-magnetic/ferromagnetic metal multilayers. Our idea is to turn the magnetic interaction by inserting Au interlayers between magnetic molecules TbPc2 and ferromagnetic Co islands and investigate the resulting change in the magnetic interaction with spin-polarized STM. We found that bilayer Co islands were regularly formed at “elbow” sites of Au(111) herringbone structure and the Co islands were covered with Au deposited afterwards. The thickness of the Au layer covering the Co islands changed with the amount of deposited Au. However, the size of the Co islands at the elbows was not large enough to realize a single-TbPc2/Au/Co structure since TbPc2 on Au is too mobile at room temperature to stay at Au/Co.

Academic Significance and Societal Importance of the Research Achievements

「単分子磁石」と基板との間に働く磁気結合の強さを制御することは、単分子磁石の磁気モーメントの方向の固定・制御を可能にするため、分子に働く磁気的相互作用の解明という学術的な興味だけでなく単分子磁石を利用した分子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。本研究によって、単分子磁石上で観測されていた近藤共鳴ピークが、強磁性基板に非磁性金属を介して近接することにより消失することがわかった。今後は、近藤共鳴ピークの消失と分子に働く磁気的相互作用の関連について検討を進めていく。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (4 results)

All 2024 2023 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (1 results) (of which Invited: 1 results)

  • [Journal Article] Moire-Assisted Realization of Octahedral MoTe2 Monolayer2023

    • Author(s)
      Yasuaki Saruta, Katsuaki Sugawara, Hirofumi Oka, Tappei Kawakami, Takemi Kato, Kosuke Nakayama, Seigo Souma, Takashi Takahashi, Tomoteru Fukumura, Takafumi Sato
    • Journal Title

      Advanced Science

      Volume: 10 Issue: 34 Pages: 2304461-2304461

    • DOI

      10.1002/advs.202304461

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Charge order with unusual star-of-David lattice in monolayer NbTe22023

    • Author(s)
      Taguchi Taiki、Sugawara Katsuaki、Oka Hirofumi、Kawakami Tappei、Saruta Yasuaki、Kato Takemi、Nakayama Kosuke、Souma Seigo、Takahashi Takashi、Fukumura Tomoteru、Sato Takafumi
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 4 Pages: 1-6

    • DOI

      10.1103/physrevb.107.l041105

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Single molecular adsorption of terbium(III) bis-phthalocyaninato (TbPc2) governed by two surface reconstructions of perovskite type SrVO3 epitaxial ultrathin film2021

    • Author(s)
      Oka Hirofumi、Katoh Keiichi、Okada Yoshinori、Oka Daichi、Hitosugi Taro、Yamashita Masahiro、Fukumura Tomoteru
    • Journal Title

      Chemistry Letters

      Volume: 50 Issue: 8 Pages: 1489-1492

    • DOI

      10.1246/cl.210270

    • NAID

      130008072823

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] スピン偏極STM によるナノ磁性・局所スピン物性の開拓2024

    • Author(s)
      岡 博文
    • Organizer
      日本表面真空学会東北・北海道支部学術講演会
    • Related Report
      2023 Annual Research Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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