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トポロジカル絶縁体を用いる超低消費電力磁気抵抗メモリの創製

Research Project

Project/Area Number 20F20050
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Review Section Basic Section 28030:Nanomaterials-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

PHAM NAM・HAI  東京工業大学, 工学院, 准教授 (50571717)

Co-Investigator(Kenkyū-buntansha) NGUYEN KHANG  東京工業大学, 工学院, 外国人特別研究員
Project Period (FY) 2020-04-24 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2021: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsスピン軌道トルク / スピンホール効果 / トポロジカル絶縁体
Outline of Research at the Start

本研究では、スピンホール効果が極めて強いかつ高い電気伝導率を両立できるトポロジカル絶縁体をスピン注入源として使用し、超低電流密度かつ超高速な書き込みができるスピン軌道トルク(SOT)-磁気抵抗メモリ(MRAM)を実証する。トポロジカル絶縁体の巨大なスピンホール効果による磁化反転を実現できれば、MRAMの書き込み電力2桁、書き込み速度1桁、ビット密度1桁が向上でき、従来の揮発性メモリであるSRAMやDRAMを置き換えると期待できる。

Outline of Annual Research Achievements

本研究では、スピンホール効果が極めて強いかつ高い電気伝導率を両立できるトポロジカル絶縁体をスピン注入源として使用し、超低電流密度かつ超高速な書き込みができるSOT-MRAMを実証する。トポロジカル絶縁体の巨大なスピンホール効果による磁化反転を実現できれば、MRAMの書き込み電力2桁、書き込み速度1桁、ビット密度1桁が向上でき、従来の揮発性メモリであるSRAMやDRAMを置き換えると期待できる。我々は2021年度の研究では、次の成果を達成した。
1.Si/SiOx基板上にスパッタリング製膜したトポロジカル絶縁体BiSb/Pt/Co/Pt垂直磁化膜を作製し、BiSbの大きなスピンホール角(2.4)および比較的に高い電気伝導率(1.0x10E5 Ohm-1m-1)を実証した。発表論文:Appl. Phys. Lett. 119, 082403, (2021)
2.サファイア基板上にスパッタリング製膜したトポロジカル絶縁体BiSb/(Co/Pt)垂直磁化膜を作製し、BiSbの巨大なスピンホール角(10.7)および高い電気伝導率(1.8x10E5 Ohm-1m-1)を達成した。発表論文:Sci. Rep. 12, 2998 (2022)
3.Si/SiOx基板上にスパッタリング製膜したトポロジカル絶縁体BiSb/(Co/Pt)垂直磁化膜の800 nmサイズの素子を作製し、BiSbによる超高速(1 ns)および超低消費電力(従来より一桁小さい電流密度)の磁反転に成功した。発表論文:Appl. Phys. Lett. 120, 152401 (2022)

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (44 results)

All 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (9 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results,  Open Access: 4 results) Presentation (24 results) (of which Int'l Joint Research: 12 results,  Invited: 3 results) Remarks (8 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Int'l Joint Research] Western Digital(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Hochiminh University of Education(ベトナム)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Nanosecond ultralow power spin orbit torque magnetization switching driven by BiSb topological insulator2022

    • Author(s)
      Nguyen Huynh Duy Khang, Takanori Shirokura, Tuo Fan, Mao Takahashi, Naoki Nakatani, Daisuke Kato, Yasuyoshi Miyamoto, and Pham Nam Hai
    • Journal Title

      Applied Physics Letters

      Volume: 120 Issue: 15 Pages: 152401-152401

    • DOI

      10.1063/5.0084927

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ultrahigh efficient spin orbit torque magnetization switching in fully sputtered topological insulator and ferromagnet multilayers2022

    • Author(s)
      Tuo Fan, Nguyen Huynh Duy Khang, Soichiro Nakano, Pham Nam Hai
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 2998-2998

    • DOI

      10.1038/s41598-022-06779-3

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Efficient spin current source using a half-Heusler alloy topological semimetal with back end of line compatibility2022

    • Author(s)
      Takanori Shirokura, Tuo Fan, Nguyen Huynh Duy Khang, Tsuyoshi Kondo, Pham Nam Hai
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 2426-2426

    • DOI

      10.1038/s41598-022-06325-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Improvement of the effective spin Hall angle by inserting an interfacial layer in sputtered BiSb topological insulator (bottom)/ferromagnet with in-plane magnetization2021

    • Author(s)
      J. Sasaki, H. H. Huy, N.H.D. Khang, P. N. Hai, Q. Le, B. York, X. Liu, S. Le, C. Hwang, M. Ho, H. Takano
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 58 Issue: 4 Pages: 3200404-3200404

    • DOI

      10.1109/tmag.2021.3115169

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Giant spin-dependent phenomena in BiSb topological insulator - ferromagnet heterostructures2021

    • Author(s)
      Nguyen Huynh Duy Khang, Pham Nam Hai
    • Journal Title

      Science and Technology in Japan

      Volume: 1 Pages: 45-45

    • DOI

      10.15625/vap.2021.0006

    • Related Report
      2021 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Low power spin-orbit torque switching in sputtered BiSb topological insulator/perpendicularly magnetized CoPt/MgO multilayers on oxidized Si substrate2021

    • Author(s)
      Tuo Fan, Nguyen Huynh Duy Khang, Takanori Shirokura, Ho Hoang Huy, Pham Nam Hai
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 8 Pages: 082403-082403

    • DOI

      10.1063/5.0062625

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Crystal growth and characterization of topological insulator BiSb thin films by sputtering deposition on sapphire substrates2020

    • Author(s)
      Tuo Fan, Mustafa Tobah, Takanori Shirokura, Nguyen Huynh Duy Khang, and Pham Nam Hai
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 59 Issue: 6 Pages: 063001-063001

    • DOI

      10.35848/1347-4065/ab91d0

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ultralow power spin-orbit torque magnetization switching induced by a non-epitaxial topological insulator on Si substrates2020

    • Author(s)
      Nguyen Huynh Duy Khang, Soichiro Nakano, Takanori Shirokura, Yasuyoshi Miyamoto, Pham Nam Hai
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 12185-12185

    • DOI

      10.1038/s41598-020-69027-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spin-orbit torque as a method for field-free detection of in-plane magnetization switching2020

    • Author(s)
      Nguyen Huynh Duy Khang and Pham Nam Hai
    • Journal Title

      Applied Physics Letters

      Volume: 117 Issue: 25 Pages: 252402-252402

    • DOI

      10.1063/5.0033158

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Nanosecond ultralow power spin orbit torque magnetization switching induced by BiSb topological insulator2022

    • Author(s)
      Nguyen Huynh Duy Khang, Takanori Shirokura, Tuo Fan, Mao Takahashi, Naoki Nakatani, Daisuke Kato, Yasuyoshi Miyamoto, Pham Nam Hai
    • Organizer
      2022 JSAP Spring meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] L10-MnGa垂直直膜における電子状態観測2022

    • Author(s)
      小林 正起, N. H. D. Khang, 武田 崇仁, 荒木 恒星, 岡野 諒, 鈴木 雅弘, 黒田 健太, 矢治 光一郎, 菅原 克明, 相馬 清吾, 中山 耕輔, 山内 邦彦, 北村 未歩, 堀場 弘司, 藤森 淳, 佐藤 宇史, 辛 埴, 田中 雅明, P. N. Hai
    • Organizer
      日本物理学会(第77回)年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] L10-MnGa 垂直直膜における電子状態観測2022

    • Author(s)
      小林 正起, N. H. D. Khang, 武田 崇仁, 荒木 恒星, 岡野 諒, 鈴木 雅弘, 黒田 健太, 矢治 光一郎, 菅原 克明, 相馬 清吾, 中山 耕輔, 山内 邦彦, 北村 未歩, 堀場 弘司, 藤森 淳, 佐藤 宇史, 辛 埴, 田中 雅明, P. N. Hai
    • Organizer
      強的秩序とその操作に関わる第14回研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Low power spin-orbit torque magnetization switching in all-sputtered BiSb topological insulator / perpendicularly magnetized CoPt / MgO multilayers on Si substrate2021

    • Author(s)
      Tuo Fan, Nguyen Huynh Duy Khang, Pham Nam Hai
    • Organizer
      2022 Joint MMM-INTERMAG
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Room-temperature spin injection and spin-to-charge conversion in a ferromagnetic semiconductor / topological insulator heterostructure2021

    • Author(s)
      Shobhit Goel, Nguyen Huynh Duy Khang, Le Duc Anh, Pham Nam Hai, Masaaki Tanaka
    • Organizer
      EP2DS-24/MSS-20 Joint Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Room-temperature spin injection and spin-to-charge conversion in a ferromagnetic semiconductor/topological insulator heterostructure2021

    • Author(s)
      Shobhit Goel, Nguyen Huynh Duy Khang, Le Duc Anh, Pham Nam Hai, Masaaki Tanaka
    • Organizer
      2021 International Conference on Solid State Devices and Materials (SSDM 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Room-temperature spin injection and spin-to-charge conversion in a ferromagnetic semiconductor/topological insulator heterostructure2021

    • Author(s)
      Shobhit Goel, Nguyen Huynh Duy Khang, Le Duc Anh, Pham Nam Hai, Masaaki Tanaka
    • Organizer
      International conference on Molecular Beam Epitaxy (21th ICMBE)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Practical Material Challenges Involved in using the Topological Insulator BiSb in a Spin Transfer Device2021

    • Author(s)
      B. York, P. N. Hai, Q. Le, C. Hwang, Nguyen H.D. Khang, Ho Hoang Huy, J. Sasaki, X. Liu, S. Le, M. Ho, H. Takano
    • Organizer
      The 32nd Magnetic Recording Conference (TMRC 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High spin Hall angle in sputtered BiSb topological insulator (bottom)/ ferromagnet with in-plane magnetization on sapphire substrates2021

    • Author(s)
      J. Sasaki, Ho Hoang Huy, Nguyen H.D. Khang, P. N. Hai, Q. Le, B. York, X. Liu, S. Le, C. Hwang, M. Ho, H. Takano
    • Organizer
      The 32nd Magnetic Recording Conference (TMRC 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Low power spin-orbit torque magnetization switching in all-sputtered BiSb topological insulator / perpendicularly magnetized CoPt / MgO multilayers on Si substrate2021

    • Author(s)
      Fan Tuo, Nguyen Huynh Duy Khang, Pham Nam Hai
    • Organizer
      82th JSAP Autumn meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] Room-temperature spin injection and spin-to-charge conversion in a ferromagnetic semiconductor / topological insulator heterostructure2021

    • Author(s)
      Shobhit Goel, Nguyen Huynh Duy Khang, Le Duc Anh, Pham Nam Hai, Masaaki Tanaka
    • Organizer
      82th JSAP Autumn meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] BiSbトポロジカル絶縁体のスピンホール効果のSb組成比依存性2021

    • Author(s)
      市村 雅貴, Nguyen Huynh Duy Khang, 高橋 真央, 宮本 泰敬, ファム ナムハイ
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Two-dimensional Electronic State in a Ferromagnetic L10 MnGa Thin Film with Perpendicular Magnetization2021

    • Author(s)
      Masaki Kobayashi, N. H. D. Khang, Takahito Takeda, Kohsei Araki, Ryo Okano, Masahiro Suzuki, Kenta Kuroda, Koichiro Yaji, Katsuaki Sugawara, Seigo Souma, Kosuke Nakayama, Miho Kitamura, Koji Horiba, Atsushi Fujimori, Takafumi Sato, Shik Shin, Masaaki Tanaka, Pham Nam Hai
    • Organizer
      82th JSAP Autumn meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] New method for field-free detection of in-plane magnetization switching induced by spin-orbit torque2021

    • Author(s)
      Nguyen Huynh Duy Khang, Pham Nam Hai
    • Organizer
      The 68th JSAP Spring meeting
    • Related Report
      2020 Annual Research Report
  • [Presentation] Topological Insulator Spintronics2020

    • Author(s)
      Pham Nam Hai, Nguyen Huynh Duy Khang, Tuo Fan, Yugo Ueda, Yasuyoshi Miyamoto
    • Organizer
      The VANJ Conference 2020 (VANJ20)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Ultrahigh efficient spin-orbit-torque magnetization switching in sputtered topological insulator BiSb/(Co/Pt)2 multilayers2020

    • Author(s)
      Tuo Fan, Nguyen Huynh Duy Khang, Soichiro Nakano, Pham Nam Hai
    • Organizer
      2020 Magnetism and Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Crystal Growth and Characterization of Topological Insulator BiSb Thin Films by Sputtering Deposition for SOT-MRAM Applications2020

    • Author(s)
      Tuo Fan, Mustafa Tobah, Takanori Shirokura, Nguyen Huynh Duy Khang, Pham Nam Hai
    • Organizer
      2020 International Conference on Solid State Devices and Materials (SSDM 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Giant spin-related transport phenomena in BiSb topological insulator/ferromagnet bilayers2020

    • Author(s)
      Nguyen Huynh Duy Khang, Tuo Fan, Pham Nam Hai
    • Organizer
      SPIE Spintronics XIII
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Giant Unidirectional Spin Hall Magnetoresistance in GaMnAs/BiSb Bilayers2020

    • Author(s)
      Nguyen Huynh Duy Khang, Pham Nam Hai
    • Organizer
      Intermag 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Giant spin Hall effect in BiSb topological insulator2020

    • Author(s)
      Pham Nam Hai, Nguyen Huynh Duy Khang, Yasuyoshi Miyamoto
    • Organizer
      The 2nd Kavli ITS Workshop on Magnetic Semiconductors
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Efficient spin-orbit torque magnetization switching by short pulse currents in non-epitaxial topological insulator BiSb-ferrimagnet heterostructures2020

    • Author(s)
      Nguyen Huynh Duy Khang, Soichiro Nakano, Takanori Shirokura, Yasuyoshi Miyamoto, Pham Nam Hai
    • Organizer
      The 81th JSAP Autumn meeting
    • Related Report
      2020 Annual Research Report
  • [Presentation] Ultrahigh efficient spin-orbit-torque magnetization switching in sputtered BiSb topological insulator and Co/Pt ferromagnetic multilayers2020

    • Author(s)
      Tuo Fan, Nguyen Huynh Duy Khang, Soichiro Nakano, Pham Nam Hai
    • Organizer
      The 81th JSAP Autumn meeting
    • Related Report
      2020 Annual Research Report
  • [Presentation] Ultralow-power and fast spin-orbit torque magnetization switching in all-sputtered BiSb topological insulator-ferrimagnet multilayers2020

    • Author(s)
      Nguyen Huynh Duy Khang, Soichiro Nakano, Takanori Shirokura, Yasuyoshi Miyamoto, Pham Nam Hai
    • Organizer
      Spin-RNJ 若手オンライン研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Ultralow-power spin-orbit torque magnetization switching in all-sputtered BiSb topological insulator-ferromagnet multilayers2020

    • Author(s)
      Nguyen Huynh Duy Khang, Soichiro Nakano, Yasuyoshi Miyamoto, Pham Nam Hai
    • Organizer
      The 67th JSAP Spring meeting
    • Related Report
      2020 Annual Research Report
  • [Remarks] トポロジカル絶縁体による磁性体の超高速磁化反転に成功

    • URL

      https://www.titech.ac.jp/news/2022/063811

    • Related Report
      2021 Annual Research Report
  • [Remarks] 東工大、SOT-MRAMでSRAMと並ぶ約200psの超高速磁化反転の可能性を証明

    • URL

      https://news.mynavi.jp/techplus/article/20220414-2321383/

    • Related Report
      2021 Annual Research Report
  • [Remarks] ナノ秒の超高速超低消費電力磁化反転に成功

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=2003

    • Related Report
      2021 Annual Research Report
  • [Remarks] スパッタリング製膜したトポロジカル絶縁体膜でスピンホール角>10を達成

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=1940

    • Related Report
      2021 Annual Research Report
  • [Remarks] Si基板上のトポロジカル絶縁体による超低電流磁化反転に成功

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=1808

    • Related Report
      2021 Annual Research Report
  • [Remarks] 面内磁化反転の新しい検出方法の提案と実証

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=1729

    • Related Report
      2020 Annual Research Report
  • [Remarks] Si基板上のトポロジカル絶縁体による超低消費電力磁化反転の実証

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=1659

    • Related Report
      2020 Annual Research Report
  • [Remarks] 高品質なトポロジカル絶縁体のスパッターリング成膜に成功

    • URL

      http://magn.pe.titech.ac.jp/lab/?p=1633

    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] SOT Reader Using BiSb Topological Insulator2022

    • Inventor(s)
      Q. Le, 他12名
    • Industrial Property Rights Holder
      Western Digital、東京工業大学
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2021 Annual Research Report
    • Overseas

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Published: 2020-07-07   Modified: 2024-03-26  

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