SEKIGUCHI Koji

Affiliation

Faculty of Engineering, Division of Intelligent Systems Engineering

Job Title

Professor

Research Fields, Keywords

spintronics, Brillouin light scattering, magnonics, magnetism


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The Best Research Achievement in Research Career 【 display / non-display 】

  • 【Published Thesis】 Time-domain Measurement of Current-induced Spin Wave Dynamics  2011.01

    【Awards】 文部科学大臣表彰若手科学者賞  2015.04

    【Published Thesis】 Spin Wave Propagation in Cubic Anisotropy Materials  2017.06

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Degree 【 display / non-display 】

  • Doctor of Science - Keio University

  • Master of Science - Keio University

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Campus Career 【 display / non-display 】

  • 2021.4
    　
    　

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Professor  

  • 2018.4
    -
    2021.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Intelligent Systems Engineering   Associate Professor  

  • 2021.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Professor  

  • 2021.4
    　
    　

    Concurrently   Yokohama National UniversityGraduate School of Engineering   Department o Physics, Electrical and Computer Engineering   Professor  

  • 2021.4
    　
    　

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mathematics, Physics, Electrical Engineering and Computer Science   Professor  

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Books 【 display / non-display 】

  • スピン波ドップラー効果とマグノン制御

    （ Role： Sole author）

    応用物理学会 

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    Language：Japanese Book type：Scholarly book

    応用物理83巻3号

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Thesis for a degree 【 display / non-display 】

  • ナノスケール強磁性体におけるスピン依存量子伝導機構の研究

    関口 康爾

    2007.3

    Doctoral Thesis   Single Work    [Reviewed]

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    ナノスケール強磁性体におけるスピン自由度に依存した電気伝導量子化が生じること、Aharonov-Bohm効果にスピン依存効果が出ることを示した。

  • 強磁性極微細線におけるスピン依存量子伝導

    関口 康爾

    2004.3

    Master Thesis   Single Work    [Reviewed]

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    原子スケールの強磁性細線では、電気伝導度がスピンに依存して量子化すること、巨大な磁気抵抗効果が出現することを明らかにした。

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Papers 【 display / non-display 】

  • Spin-wave switching using dynamic magnonic crystal

    Iwaba Masashi, Sekiguchi Koji

    APPLIED PHYSICS EXPRESS   14 ( 7 )   073002-1 - 073002-5   2021.7  [Reviewed]

    DOI Web of Science

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    Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

  • External Magnetic Field Dependence of Spin-wave Propagation in Ferromagnetic Thin Films with Multi-domain State

    Nezu S., Sekiguchi K.

    Transaction of the Magnetics Society of Japan Special Issues   5 ( 1 )   6 - 9   2021

    DOI CiNii

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Magnetics Society of Japan   Joint Work  

    <p>  The spin-wave propagation characteristics in ferromagnetic thin films with a multi-domain state were investigated by micromagnetic simulations and electrical measurements. The simulations showed that the spin waves propagated along the domain wall when excited at low frequencies. The resonance frequency shifted to a higher frequency when an external magnetic field was applied normal to the waveguide. By using a vector network analyzer, spin-wave propagation at the predicted resonance frequency was detected. The external magnetic field dependence of the resonance frequency agreed with the simulation result.</p>

    Other Link： https://ci.nii.ac.jp/naid/130008033615

  • Strong Absorption Effect for Propagating Backward Spin-Waves by Double Magnonic Crystal

    Iwaba M., Fujiwara S., Sekiguchi K.

    Transaction of the Magnetics Society of Japan Special Issues   4 ( 1 )   18 - 22   2020.5

    DOI CiNii

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：The Magnetics Society of Japan   Joint Work  

    Other Link： https://ci.nii.ac.jp/naid/130007802673

  • Numerical study on the enhancement of the magneto-optic Kerr effect using a dielectric thin film

    Tachizaki Takehiro, Mizuno Hiroyuki, Sekiguchi Koji

    JAPANESE JOURNAL OF APPLIED PHYSICS   59 ( SE )   EA06-1 - EA06-5   2020.4  [Reviewed]

    DOI Web of Science

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    Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

  • Magnetics and Optics Research FOREWORD

    Okamoto Satoshi, Munekata Hiro, Goto Taichi, Kohda Makoto, Matsuda Iwao, Sekiguchi Koji, Shiratsuch … Show more authors

    JAPANESE JOURNAL OF APPLIED PHYSICS   59   2020.4  [Reviewed]

    DOI Web of Science

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    Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

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Review Papers 【 display / non-display 】

  • The Basis of Magnon Transistors

    K. Sekiguchi

    AAPPS Bulletin 28, 2 (2018).   2018

    DOI

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    Language：English   Publishing type：Article, review, commentary, editorial, etc. (international conference proceedings)  

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Grant-in-Aid for Scientific Research 【 display / non-display 】

  • マグノニック機能創発のための電圧効果と凝縮効果の研究

    2019.4

    科学研究費補助金  Grant-in-Aid for Scientific Research(A)

    Investigator(s)：関口康爾

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    Grant type：Competitive

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Presentations 【 display / non-display 】

  • Magnon transistor for next generation computing (invited)

    K. Sekiguchi  [Invited]

    Magnon transistor for next generation computing  MSJ

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    Event date： 2019.9

    Language：English   Presentation type：Oral presentation (general)  

  • Time domain Detection of Multiple Spin-wave Solitons Generation

    M. Kawase, M. Iwaba, and K. Sekiguchi

    Time domain Detection of Multiple Spin-wave Solitons Generation  MORIS2019

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    Event date： 2019.6

    Language：English   Presentation type：Oral presentation (general)  

  • Shape-Forming of Spin Wave Packets by Dynamic Magnonic Crystal

    M. Iwaba, K. Sekiguchi,

    Shape-Forming of Spin Wave Packets by Dynamic Magnonic Crystal  MORSI2019, We-02-2

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    Event date： 2019.6

    Language：English   Presentation type：Oral presentation (general)  

  • Generation of fast propagating spin-wave for magnonic logic functions

    K. Sekiguchi  [Invited]

    Collaborative Conference on Materials Research (CCMR) 2018, 27June. 2018 (invited)  

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    Event date： 2018.6

    Language：English   Presentation type：Oral presentation (invited, special)  

    K. Sekiguchi, "Generation of fast propagating spin-wave for magnonic logic functions", Collaborative Conference on Materials Research (CCMR) 2018, 27June. 2018 (invited)
    (http://ccmr2018.org/program/)

  • Edge-mode Spin-wave Nonreciprocity for Magnonic Logic Functions

    K. Sekiguchi  [Invited]

    5th International Conference of Asian Union of Magnetics Societies (IcAUMS 2018), G4-1399, 7June. 2018 (invited) 

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    Event date： 2018.6

    Language：English   Presentation type：Oral presentation (invited, special)  

    K. Sekiguchi, "Edge-mode Spin-wave Nonreciprocity for Magnonic Logic Functions", 5th International Conference of Asian Union of Magnetics Societies (IcAUMS 2018), G4-1399, 7June. 2018 (invited)
    (http://www.icaums.org/main/pr_program.htm)

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Charge of on-campus class subject 【 display / non-display 】

  • 2021   システムデバイス実習

    Graduate school of Engineering Science

  • 2021   スピントロ二クス特論

    Graduate school of Engineering Science

  • 2021   先端集積システム解析F

    Graduate school of Engineering Science

  • 2021   先端集積システム解析S

    Graduate school of Engineering Science

  • 2021   先端集積システム設計F

    Graduate school of Engineering Science

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