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Spin state evaluation of electrons field-emitted from graphene edges and development of a novel spin polarized electron source

Research Project

Project/Area Number 17K19053
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Applied condensed matter physics and related fields
Research InstitutionToyota Physical and Chemical Research Institute (2018)
Nagoya University (2017)

Principal Investigator

Saito Yahachi  公益財団法人豊田理化学研究所, フェロー事業部門, フェロー (90144203)

Co-Investigator(Kenkyū-buntansha) 永井 滋一  三重大学, 工学研究科, 助教 (40577970)
Research Collaborator NAKAHARA Hitoshi  
Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Keywordsグラフェン / エッジ状態 / 電子スピン / スピン偏極 / 電界放出 / 酸化グラフェン / パイ電子
Outline of Final Research Achievements

Spin polarization of field-emitted electrons from graphene edges was measured by a field emission apparatus equipped with a spin rotator and a Mott spin polarization analyzer.
For a graphene emitter showing a lip pattern, spin polarizations of 57.0 % and 66.5% in magnitude at room temperature and low temperature (45K) were respectively measured, indicating the presence of spin-polarized states at graphene edges. Additionally, stepwise changes in the spin polarization between two states with high and low spin polarization were observed for a 120 min measurement, which is considered to be caused by adsorption and desorption of residual gases, such as hydrogen, on the graphene edges.

Academic Significance and Societal Importance of the Research Achievements

従来のグラフェン端のスピン秩序配列の実験的検証は,固体基板上のグラフェン・ナノリボンを試料とする各種の走査プローブ顕微鏡法による電子状態測定,グラフェン片集合体を試料とする磁気測定などの状況証拠的あるいは間接的なものでしかない。これに対して,本研究では,超高真空中で支持されたグラフェンの端からのトンネル効果により放出された電子のスピン偏極を直接測定するという独自の手法により,そのスピン偏極を実証した点に学術的意義がある。
また,炭素ベースの全く新しいスピン偏極電子源の開発ならびにグラフェン端のナノ磁性を利用したスピントロニクスへの展開の萌芽となり得る点で社会的意義がある。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017 Other

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

  • [Journal Article] グラフェンの電界放出顕微鏡法によるエッジ状態の研究2019

    • Author(s)
      齋藤弥八
    • Journal Title

      豊田研究報告

      Volume: 第72号

    • Related Report
      2018 Annual Research Report
    • Open Access
  • [Presentation] Edge States of Graphene Revealed by Field Emission Microscopy2019

    • Author(s)
      Yahachi Saito, Yuhdai Watanabe, Tohru Hoshino, Hitoshi Nakahara, Shigekazu Nagai, Hiromu Ikemizu3, Kazuya Kunoh, Koichi Hata
    • Organizer
      The 11th Recent Progress in Graphene and 2D Materials Research
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] FEM and FIM of Graphene: Possible Observation of Electronic States at Edges2018

    • Author(s)
      Yahachi Saito, Yuhdai Watanabe, Tohru Hoshino, Hitoshi Nakahara, Kazuya Kunoh, Shigekazu Nagai, and Koichi Hata
    • Organizer
      The 31st International Vacuum Nanoelectronics Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of Edge States of Graphene by FEM and FIM2018

    • Author(s)
      Yahachi Saito, Yuhdai Watanabe, Tohru Hoshino, and Hitoshi Nakahara
    • Organizer
      第55回FNTG総合シンポジウム
    • Related Report
      2018 Annual Research Report
  • [Presentation] 電界放出電子によるグラフェンエッジのスピン状態の観察2018

    • Author(s)
      池水大夢,久納和也,来住昴宥,永井滋一,岩田達夫,畑浩一,渡邉雄大,中原仁,齋藤弥八
    • Organizer
      2018年表面真空学会学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Graphene edges studied by field emission microscopy; Observation of symmetry of electronic states and spin polarization2017

    • Author(s)
      Yahachi Saito
    • Organizer
      第4回 日本―インドセミナー
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Spin polarization of field-emitted electrons from graphene edges2017

    • Author(s)
      Shigekazu Nagai, Hiromu Ikemizu, Kazuya Kunoh, Koichi Hata, Yudai Watanabe, Toru Hoshino, Masaru Irita, Hitoshi Nakahara and Yahachi Saito
    • Organizer
      11th International Symposium on Atomic Level Characterizations for New Materials and Devices
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Field Emission from carbon nanotube and graphene: Its Application and Related Phenomena2017

    • Author(s)
      Yahachi Saito
    • Organizer
      11th International Symposium on Atomic Level Characterizations for New Materials and Devices
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 公益財団法人 豊田理化学研究所

    • URL

      https://www.toyotariken.jp/

    • Related Report
      2018 Annual Research Report
  • [Remarks] 齋藤弥八研究室

    • URL

      http://www.surf.nuqe.nagoya-u.ac.jp

    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-07-21   Modified: 2020-03-30  

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