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Realization of ultra-fast and low-power-consumption method for magnetization control utilizing quantum effects of ferromagnetic materials

Research Project

Project/Area Number 19K21961
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Le Duc Anh  東京大学, 大学院工学系研究科(工学部), 助教 (50783594)

Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
KeywordsFe系強磁性半導体 / 超高速磁化制御 / 強磁性量子井戸 / 波動関数制御法 / ポンプアンドプローブ法 / スピントロニクス / スピンダイナミック / 波動関数工学 / ポンプアンドプローブ / 強磁性半導体 / 量子効果 / スピンダイナミックス / スピントランジスタ
Outline of Research at the Start

鉄系強磁性半導体 (In,Fe)Asの薄膜構造からなる量子井戸においてキャリアの2次元波動関数と強磁性層の重なりの変調により磁気特性を制御できる。この波動関数制御法は、i)キャリアの総数の変化を要しないこと、ii)キャリアの移動距離が量子井戸の幅の数nmで非常に短いことから、従来のキャパシタ効果による制御法より超高速かつ超低消費電力の磁化制御が期待できる。しかし、前の研究ではイオン液体による電気二重層の形成を用いたため、高速な制御の実証まで至っていない。本研究は(In,Fe)As量子井戸の個体トランジスタ構造を作製し、psオーダーの電気的な磁性制御の実証とそのスピンダイナミックの解明を行う。

Outline of Final Research Achievements

In this research, in order to realize an ultrafast control of magnetic properties of ferromagnets, we proposed and successfully demonstrated a new method by controlling the carrier wavefunction in low-dimensional ferromagnetic structures. In the demonstration experiment using a pump-and-probe method, we were able to induce a magnetization enhancement in an unprecedentedly short time scale of 600 fs in N-type ferromagnetic semiconductors (FMS) (In,Fe)As quantum wells, which was caused by the ultrafast changing of the electron wavefunctions upon the irradiation of a fs-pulse of the pumping laser. Furthermore, we developed some other low-dimensional ferromagnetic structures of Fe-doped FMSs such as ferromagnetic superlattices and quantum dots, to which the proposed ultrafast magnetization control method can possibly be applied. The realization of the world's fastest magnetization enhancement here promisingly leads to the next-generation of ultra-high-speed, low-consumption spin devices.

Academic Significance and Societal Importance of the Research Achievements

次世代の電子デバイスは超高速と低消費電力が強く要求される中、電子のスピン自由度を活用スピンデバイスとスピンに基づいた情報処理が有力候補になりつつある。スピンデバイスの基本操作である磁化制御を如何により高速、低電力で実現できるかが大きな課題である。本萌芽研究ではその究極的な方法として低次元強磁性構造の波動関数制御法を提案し、現在の制御法より1000倍も速い世界最速の磁化増大制御の実証まで成功した。この新制御法がより広範囲で応用できれば次世代の超高速低消費スピンデバイスに繋がり現存の情報処理技術に革新的な進歩をもたらせると期待できる。

Report

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

    (12 results)

All 2021 2020 2019 Other

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results) (of which Overseas: 1 results)

  • [Journal Article] Minority-spin impurity band in n-type (In,Fe)As: A materials perspective for ferromagnetic semiconductors2021

    • Author(s)
      Kobayashi Masaki、Anh Le Duc、Minar Jan、Khan Walayat、Borek Stephan、Hai Pham Nam、Harada Yoshihisa、Schmitt Thorsten、Oshima Masaharu、Fujimori Atsushi、Tanaka Masaaki、Strocov Vladimir N.
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 11 Pages: 115111-115111

    • DOI

      10.1103/physrevb.103.115111

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Growth and characterization of ferromagnetic Fe-doped GaSb quantum dots with high Curie temperature2020

    • Author(s)
      Sriharsha Karumuri、Anh Le Duc、Shimada Yuuji、Takahashi Takuji、Tanaka Masaaki
    • Journal Title

      APL Materials

      Volume: 8 Issue: 9 Pages: 091107-091107

    • DOI

      10.1063/5.0017938

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evolution of Fe 3d impurity band state as the origin of high Curie temperature in the p-type ferromagnetic semiconductor (Ga,Fe)Sb2020

    • Author(s)
      Takeda Takahito、Sakamoto Shoya、Araki Kohsei、Fujisawa Yuita、Anh Le Duc、Thanh Tu Nguyen、Takeda Yukiharu、Fujimori Shin-ichi、Fujimori Atsushi、Tanaka Masaaki、Kobayashi Masaki
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 24 Pages: 245203-245203

    • DOI

      10.1103/physrevb.102.245203

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Observation of quantum size effect at the conduction band bottom of n-type ferromagnetic semiconductor (In,Fe)As thin films2019

    • Author(s)
      Shingo Kaneta, Le Duc Anh, Karumuri Sriharsha, Masaaki Tanaka
    • Journal Title

      Applied Physics Express

      Volume: 12 Issue: 7 Pages: 073001-073001

    • DOI

      10.7567/1882-0786/ab25c8

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Ferromagnetism and giant magnetoresistance in zinc-blende FeAs/InAs superlattice structures2020

    • Author(s)
      Le Duc Anh, Taiki Hayakawa, Yuji Nakagawa, Hikari Shinya, Tetsuya Fukushima,Hiroshi Katayama-Yoshida, Yoshihiro Iwasa, and Masaaki Tanaka
    • Organizer
      The 65th Annual Conference on Magnetism & Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] n型およびp型Fe系強磁性半導体 -高いキュリー温度の実現とヘテロ構造デバイスへの展開-2020

    • Author(s)
      Le Duc Anh
    • Organizer
      第76回スピントロニクス専門研究会「イマドキの磁性材料開発と理論設計」(オンライン)
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Properties of quaternary-alloy ferromagnetic semiconductor (In,Ga,Fe)Sb2020

    • Author(s)
      Tomoki Hotta, Kengo Takase, Kosuke Takiguchi, Karumuri Sriharsha, Le Duc Anh, Masaaki Tanaka
    • Organizer
      The 65th Annual Conference on Magnetism & Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Transport and magnetic properties of quaternary-alloy ferromagnetic semiconductor (In,Ga,Fe)Sb2020

    • Author(s)
      Tomoki Hotta, Kengo Takase, Kosuke Takiguchi, Karumuri Sriharsha, Le Duc Anh and Masaaki Tanaka
    • Organizer
      2020 International Conference on Solid State Devices and Materials (SSDM)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ultrafast enhancement of magnetization in ferromagnetic semiconductor (In,Fe)As quantum wells2020

    • Author(s)
      Le Duc Anh, Masaki Kobayashi, Takahito Takeda, Kohsei Araki, Ryo Okano, Toshihide Sumi, Masafumi Horio, Kohei Yamamoto, Yuya Kubota, Shigeki Owada, Makina Yabashi, Iwao Matsuda, Masaaki Tanaka
    • Organizer
      2021年 第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Remarks] 東京大学工学系研究科電気系工学専攻田中大矢中根研究室ホームページ

    • Related Report
      2020 Annual Research Report
  • [Remarks] Le Duc Anh個人サイト

    • URL

      http://www.cryst.t.u-tokyo.ac.jp/anh-info/

    • Related Report
      2020 Annual Research Report
  • [Patent(Industrial Property Rights)] 半導体デバイスおよびその製造方法2020

    • Inventor(s)
      Le Duc Anh,金田真悟、大矢忍、田中雅明、田畑仁、関宗俊
    • Industrial Property Rights Holder
      国立大学法人東京大学
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report
    • Overseas

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Published: 2019-07-04   Modified: 2025-03-27  

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