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Terahertz spintronics by electromagnon

Research Project

Project/Area Number 17K19050
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Applied condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Takahashi Youtarou  東京大学, 大学院工学系研究科(工学部), 准教授 (30631676)

Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords光物性 / マルチフェロイクス / テラヘルツ分光 / 磁性体 / マルチフェロイック
Outline of Final Research Achievements

We investigated the spin-current generation via the electromagnon resonance by terahertz excitation in multiferroics. In order to excite the electromagnon resonance, we constructed the high-field terahertz system, whose average power and center frequency are 1.8 mW and 1 THz,with the repetition rate of 1 kHz. The multiferroics with strong electromagnon resonance even in the room temperature was found in the Y-type hexaferrite. The device composed of this material was fabricated, so as to detect the spin current signal. We succeeded in the detection of spin-current generated by the terahertz radiation by using the inverse spin-Hall effect.

Academic Significance and Societal Importance of the Research Achievements

スピン流は物質中の新しい流れとして応用も含めた広い観点から大きな注目を集めている。通常、マグノンスピンポンピングではマイクロ波によるスピン波励起が用いられるが、本研究では光の電場に応答するエレクトロマグノン励起を利用してテラヘルツ帯の光を用いてスピン流生成を実現させることを目的とした。強力な光源を得ることが難しいテラヘルツ帯で、巨大なエレクトロマグノン共鳴を持つ物質の見出すことに成功し、その材料を用いてテラヘルツ光によって生成されたスピン流観測に成功した。本研究で実現したスピン流観測法の確立は、有効な光学デバイスの少ないテラヘルツ帯での光機能開拓への展開が期待できる。

Report

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

    (8 results)

All 2018 2017 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Electromagnon resonance at room temperature with gigantic magnetochromism2018

    • Author(s)
      H. Shishikura, Y. Tokunaga, Y. Takahashi, R. Masuda, Y. Taguchi, Y. Kaneko, and Y. Tokura
    • Journal Title

      PHYSICAL REVIEW APPLIED

      Volume: 9 Issue: 4 Pages: 044033-044033

    • DOI

      10.1103/physrevapplied.9.044033

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electromagnon resonance at room temperature with gigantic magnetochromism2018

    • Author(s)
      H. Shishikura, Y. Tokunaga, Y. Takahashi, R. Masuda, Y. Taguchi, Y. Kaneko, and Y. Tokura
    • Journal Title

      Physical Review Applied (2018)(accepted)

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Optical magnetoelectric effect with electromagnon resonance on multiferroics2018

    • Author(s)
      Y. Takahashi
    • Organizer
      LEES 2018, June 24, 2018(Ancone, Italy)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] マルチフェロイクス のエレクトロマグノン共鳴におけるコヒーレント分極変調2018

    • Author(s)
      井口照悟, 金子良夫, 増田亮二, 肉倉洋恵, 十倉好紀, 高橋陽太郎
    • Organizer
      日本物理学会2018年秋季大会、同志社大学
    • Related Report
      2018 Annual Research Report
  • [Presentation] Terahertz magnetoelectric optics with electromagnons on helical magnets2017

    • Author(s)
      Y. Takahashi
    • Organizer
      Workshop Optomagnonics 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Y型ヘキサフェライトBa2Mg2Fe12O22のエレクトロマグノンにおける巨大ファラデー効果2017

    • Author(s)
      肉倉洋恵, 石渡晋太郎, 田口康二郎, 増田亮二, 十倉好紀, 高橋陽太郎
    • Organizer
      日本物理学会 2017年秋季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Terahertz Faraday effect on electromagnon resonance in Y-type hexaferrite Ba2Mg2Fe12O222017

    • Author(s)
      Hiroe Shishikura, Shintaro Ishiwata, Yasujro Taguchi, Ryoji Masuda, Yoshinori Tokura, Youtarou Takahashi
    • Organizer
      The 9th APCTP Workshop on Multiferroics
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 高橋研究室ホームページ

    • URL

      http://www.qpec.t.u-tokyo.ac.jp/takahashi_lab/index.html

    • Related Report
      2018 Annual Research Report

URL: 

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

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