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Frequency Modulated Terahertz Laser Emitting Devices

Research Project

Project/Area Number 21K18872
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 28:Nano/micro science and related fields
Research InstitutionShinshu University

Principal Investigator

LIU Xiaoxi  信州大学, 学術研究院工学系, 教授 (10372509)

Project Period (FY) 2021-07-09 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
KeywordsSpin-orbital-coupling / spintronics / グラフェン薄膜 / テラヘルツ波 / スピン軌道相互作用 / マグノン / スピン波 / 垂直磁化薄膜 / フェライト / テラヘルツレーザー / スピントロニクス
Outline of Research at the Start

テラヘルツ波は周波数0.3-10 THzの帯域の電磁波である。この帯域はマイクロ波と赤外線の中間に位置しており、赤外線のように直線伝搬特性と、マイクロ波のように様々な物質を透過できる特性を両立している。3次元イメージングが可能な可視化手段として、医療診断、LSIチップの故障解析、セキュリティ対策、医薬品、食品の品質管理等分野への応用が期待されている。
本研究では、研究者これまで蓄積したスピントロニクの知識並びに2次元グラフェン薄膜のスピン輸送特性を用いて、高い発光率・小型・コヒーレントなテラヘルツ波発生とその制御が研究の目的概要とする。

Outline of Final Research Achievements

In this research, we have focused on the preparation of the ferrimagnetic single crystal magnetic thin films and graphene films on top it. We have investigated the magnetic, spin transport, transmittance, and spin-orbit coupling in the unique structures. We have also developed a reliable process to introducing periodic domain structures inside the ferrite films. The magnetic films have orthogonal crystal structures. The transmittance higher than 99% were found for wavelengths longer than 1100 nm. We have successfully prepared (00l) orientated graphene films onto the magnetic films according to the X-ray diffraction diagrams. Raman spectrums show clear 2D, G shift of graphene of the films.

Academic Significance and Societal Importance of the Research Achievements

理論上、グラフェンはディラックコーンと呼ばれるバンド構造が存在し、ディラックコーンの頂点における電子は、位置と運動量がある点に決定されるという、ハイゼンベルグの不確定性原理に相反してしまう状態になる。しかしながら相対論効果では、位置幅と運動量幅を大きくすることで不確定性原理の相反を回避しようとし、そのため電子の速度が急激に大きくなる。本研究はマグノンの電子移動度への影響に着目し、新しい学術原理の発見に役立つ研究である。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (8 results)

All 2023 2022 2021

All Journal Article (7 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Chiral Skyrmions Interacting with Chiral Flowers2023

    • Author(s)
      Zhang Xichao、Xia Jing、Tretiakov Oleg A.、Ezawa Motohiko、Zhao Guoping、Zhou Yan、Liu Xiaoxi、Mochizuki Masahito
    • Journal Title

      Nano Letters

      Volume: 23 Issue: 24 Pages: 11793-11801

    • DOI

      10.1021/acs.nanolett.3c03792

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Laminar and transiently disordered dynamics of magnetic-skyrmion pipe flow2023

    • Author(s)
      Zhang Xichao、Xia Jing、Tretiakov Oleg A.、Ezawa Motohiko、Zhao Guoping、Zhou Yan、Liu Xiaoxi、Mochizuki Masahito
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 14 Pages: 144428-144428

    • DOI

      10.1103/physrevb.108.144428

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] High saturation magnetization and high coercivity of Co substituted orthoferrite2023

    • Author(s)
      Sawamoto Atsushi、Liu Xiaoxi
    • Journal Title

      IEEE International Magnetics

      Volume: 979-8-3503-3836-2 Pages: 1-2

    • DOI

      10.1109/intermagshortpapers58606.2023.10228703

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Qubits based on merons in magnetic nanodisks2022

    • Author(s)
      Xia Jing、Zhang Xichao、Liu Xiaoxi、Zhou Yan、Ezawa Motohiko
    • Journal Title

      Communications Materials

      Volume: 3 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s43246-022-00311-w

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Reversible Transformation between Isolated Skyrmions and Bimerons2022

    • Author(s)
      Ohara Kentaro、Zhang Xichao、Chen Yinling、Kato Satoshi、Xia Jing、Ezawa Motohiko、Tretiakov Oleg A.、Hou Zhipeng、Zhou Yan、Zhao Guoping、Yang Jinbo、Liu Xiaoxi
    • Journal Title

      Nano Letters

      Volume: 22 Issue: 21 Pages: 8559-8566

    • DOI

      10.1021/acs.nanolett.2c03106

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of gas pressure on the quality-factor of single-crystal diamond micro cantilevers2022

    • Author(s)
      Chen Yinling、Sang Liwen、Koizumi Satoshi、Koide Yasuo、Liu Xiaoxi、Liao Meiyong
    • Journal Title

      Diamond and Related Materials

      Volume: 129 Pages: 109340-109340

    • DOI

      10.1016/j.diamond.2022.109340

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Self-Assembled Hexagonal Superparamagnetic Cone Structures for Fabrication of Cell Cluster Arrays2021

    • Author(s)
      Chen Yinling、Hu Zhixin、Zhao Dongyang、Zhou Kejia、Huang Zhenyu、Zhao Wuduo、Yang Xiaonan、Gao Chaojun、Cao Yangjie、Hsu Yenya、Chang Weijen、Wei Zonhan、Liu Xiaoxi
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 13 Issue: 9 Pages: 10667-10673

    • DOI

      10.1021/acsami.0c17890

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Confinement and Protection of Magnetic Skyrmions2022

    • Author(s)
      Xiaoxi Liu
    • Organizer
      The 2022 Joint MMM-INTERMAG Conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-07-13   Modified: 2025-01-30  

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