Atomic-scale defect control of electric field driven Fe/MgO magnetic device using spin-polarized STM

• Project/Area Number: 17K19023
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Research Field: Nano/Micro science and related fields
• Research Institution: Chiba University
• Principal Investigator: Yamada Toyo Kazu 千葉大学, 大学院工学研究院, 准教授 (10383548)
• Project Period (FY): 2017-06-30 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000); Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 磁気デバイス / 鉄 / MgO / 原子 / 電界 / トンネル磁気抵抗 / Fe / STM / 走査トンネル顕微鏡 / ＭｇＯ / スピンとニクス / 表面磁性 / スピントロニクス / スピン偏極STM / スピンエレクトロニクス / ナノ材料 / 走査プローブ顕微鏡 / 磁性 / 表面・界面物性

Outline of Final Research Achievements

Atomically-flat MgO monolayer films were grown on oxygen precoated Fe(001)-p(1×1)O substrate. Iron single atoms were deposited on this substrate. All experiments were performed in ultra-high vacuum at cryogenic temperatures (5 K). Scanning tunneling microscopy (STM) visualized single Fe atom absorption. We used the STM tip to apply high electric field to the Fe atom. We found the threshold electric field of 2.5 GV/m. Below 2.5 GV/m the Fe atoms stay on the surface, while the higher fields provided Fe atom desorption.

Academic Significance and Societal Importance of the Research Achievements

世界中の全ての情報は、データセンターの無数の磁石で記憶されている。磁石に磁界を印加し、磁石の向きを変えることで情報が書き込まれる。微小コイルに電流を流して磁界を印加するが、必ずジュール熱が発生する。電力消耗の無い情報書き込み手法として、電界で磁石の特性を変える手法がある。しかし、電界が金属磁石に侵入できるのは僅か原子数層であり、また電界印加による原子構造変化もよくわかっていなかった。本研究で我々は、磁気情報デバイスに幅広く使用されているFe/MgO系を使用し、鉄原子１個を直接観察しながら電界を印加した。電界2.5 GV/mまで安定に吸着している事を実証した。

Research Products

• [Int'l Joint Research] カールスルーエ工科大学(ドイツ)
• [Int'l Joint Research] 台湾国立清華大学(その他の国・地域)
• [Int'l Joint Research] マドリード自治大学(スペイン)
• [Int'l Joint Research] カールスルーエ工科大学(ドイツ)
• [Int'l Joint Research] カールスルーエ工科大学(ドイツ)
• [Int'l Joint Research] マドリッド自治大学(スペイン)
• [Journal Article] 雪山へ舞う白鳥 (2020)
  • Author(s): 安藤 紗絵子、根本 諒平、山田 豊和
  • Journal Title: Oyo Buturi Volume: 89 Issue: 2 Pages: 63-63
  • DOI: 10.11470/oubutsu.89.2_63
  • NAID: 130007796085
  • ISSN: 0369-8009, 2188-2290
  • Year and Date: 2020-02-10
• [Journal Article] Carbon Monoxide Stripe Motion Driven by Correlated Lateral Hopping in a 1.4 × 1.4 Monolayer Phase on Cu(111) (2020)
  • Author(s): Nazriq Nana K. M.、Kr?ger Peter、Yamada Toyo Kazu
  • Journal Title: The Journal of Physical Chemistry Letters Volume: 11 Issue: 5 Pages: 1753-1761
  • DOI: 10.1021/acs.jpclett.9b03645
  • Peer Reviewed
• [Journal Article] Direct Imaging of Precursor Adcomplex States during Cryogenic-Temperature On-Surface Metalation: Scanning Tunneling Microscopy Study on Porphyrin Array with Fe Adsorption at 78.5 K (2020)
  • Author(s): Inami Eiichi、Yamaguchi Masataka、Nemoto Ryohei、Yorimitsu Hideki、Kr?ger Peter、Yamada Toyo Kazu
  • Journal Title: The Journal of Physical Chemistry C Volume: 124 Issue: 6 Pages: 3621-3631
  • DOI: 10.1021/acs.jpcc.9b09795
  • Peer Reviewed
• [Journal Article] カブトムシの幼虫 (2019)
  • Author(s): ナズリク ナナ、山田 豊和
  • Journal Title: Oyo Buturi Volume: 88 Issue: 10 Pages: 641-641
  • DOI: 10.11470/oubutsu.88.10_641
  • NAID: 130007725673
  • ISSN: 0369-8009, 2188-2290
  • Year and Date: 2019-10-10
• [Journal Article] Fabrication of tungsten tip probes within 3 s by using flame etching (2019)
  • Author(s): Yamaguchi Takayuki、Inami Eiichi、Goto Yuto、Sakai Yuta、Sasaki Satoru、Ohno Teruaki、Yamada Toyo Kazu
  • Journal Title: Review of Scientific Instruments Volume: 90 Issue: 6 Pages: 063701-063701
  • DOI: 10.1063/1.5085251
  • NAID: 130007737588
  • Peer Reviewed
• [Journal Article] Well-Ordered Monolayer Growth of Crown-Ether Ring Molecules on Cu(111) in Ultra-High Vacuum: An STM, UPS, and DFT Study (2019)
  • Author(s): Nemoto Ryohei、Kr?ger Peter、Putri Hartini Ayu Novita、Hosokai Takuya、Horie Masaki、Kera Satoshi、Yamada Toyo Kazu
  • Journal Title: The Journal of Physical Chemistry C Volume: 123 Issue: 31 Pages: 18939-18950
  • DOI: 10.1021/acs.jpcc.9b03335
  • Peer Reviewed / Open Access
• [Journal Article] Spin-Polarized STM Overview and Issues for Next Developments (2017)
  • Author(s): 山田 豊和
  • Journal Title: Journal of the Vacuum Society of Japan Volume: 60 Issue: 5 Pages: 159-164
  • DOI: 10.3131/jvsj2.60.159
  • NAID: 130006900152
  • ISSN: 1882-2398, 1882-4749
  • Peer Reviewed
• [Presentation] 酸素プレコート Fe(001)基板上の MgO(001)超薄膜成長と Fe 蒸着表面の超高真空 STM 研究 (2020)
  • Author(s): 野中悠司, Nana Nazriq，佐々木悟，小菅裕太郎, 山田豊和
  • Organizer: 第81回応用物理学会秋季学術講演会
• [Presentation] Fe atom absorption on insulating MgO monolayer films grown on Fe(001)-p(1×1)O (2020)
  • Author(s): Yuji Nonaka, Nana K. M. Nazriq, Toyo Kazu Yamada
  • Organizer: International Conference on Scanning Probe Microscopy (ICSPM28)
  • Int'l Joint Research
• [Presentation] LT-UHV-STM study of single magnetic atoms (2020)
  • Author(s): 山田豊和
  • Organizer: ナノ学会部会シンポジウム
  • Invited
• [Presentation] On-surface synthesis of single molecular magnets by contacting magnetic atoms to π-conjugated molecules using STM manipulation, (2019)
  • Author(s): 山田豊和
  • Organizer: International Vecuum Congress 21 (IVC21),
  • Int'l Joint Research
• [Presentation] Cu(111)上の環状分子配列への磁性原子吸着によるスピンネットワーク作製：超高真空低温STM研究 (2019)
  • Author(s): 根本諒平
  • Organizer: 2019年日本表面真空学会学術講演会
• [Presentation] スピン偏極STMによる反強磁性膜上の強磁性層間での非線形磁気結合観察 (2018)
  • Author(s): 山田豊和, 山口貴之, 坂井勇太, 横田健太, 小菅裕太郎,ナナ ナズリク
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] STM Study for Single Molecule Devices (2017)
  • Author(s): T. K. Yamada
  • Organizer: the Asia Pacific Society for Materials Research 2017 Annual Meeting (APSMR 2017 Annual Meeting)
  • Int'l Joint Research / Invited
• [Presentation] STM conductance measurements through single organic and life molecules (2017)
  • Author(s): T. K. Yamada
  • Organizer: The International Conference on Small Science (ICSS) 2017
  • Int'l Joint Research / Invited
• [Presentation] スピン偏極STMによるFe単原子膜中のスキルミオン観察 (2017)
  • Author(s): 山口 貴之，ウルフ ウルフヘケル，山田 豊和
  • Organizer: 2017年真空・表面科学合同講演会
• [Presentation] STM study of confinement patterns in Mn nanoclusters on bcc-Fe(110) (2017)
  • Author(s): Takayuki Yamaguchi, Nana K. M. Nazriq, Eiichi Inami, Toyo Kazu Yamada
  • Organizer: The 8th International Symposium on Surface Science (ISSS-8)
  • Int'l Joint Research
• [Book] Compendium of Surface and Interface Analysis (2018)
  • Author(s): Toyo Kazu Yamada, et al.
  • Total Pages: 853
  • Publisher: Springer
  • ISBN: 9789811061561
• [Remarks] 山田豊和研究室ホームページ
  • URL: https://adv.chiba-u.jp/nano/yamada-upload/index.html
• [Remarks] 山田豊和研究室ホームページ
  • URL: https://adv.chiba-u.jp/nano/yamada-upload/
• [Remarks] http://adv.chiba-u.jp/nano/yamada-upload/
• [Remarks] 山田豊和研究室HP
  • URL: http://adv.chiba-u.jp/nano/yamada-upload/