SEKIGUCHI Koji

Affiliation

Faculty of Engineering, Division of Intelligent Systems Engineering

Job Title

Professor

Research Fields, Keywords

spintronics, Brillouin light scattering, magnonics, magnetism


To the head of this page.▲

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

To the head of this page.▲

Degree 【 display / non-display 】

  • Doctor of Science - Keio University

  • Master of Science - Keio University

To the head of this page.▲

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  

display all >>

To the head of this page.▲
 

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 

    　More details

    Language：Japanese Book type：Scholarly book

    応用物理83巻3号

To the head of this page.▲

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]

    　More details

    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]

    　More details

    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。

To the head of this page.▲

Papers 【 display / non-display 】

  • Spin-wave interconversion via thermoelectric point-contact control

    Takuro Eguchi, Shoki Nezu, Yu Naemura, and Koji Sekiguchi

    Physical Review Research   4   033135   2022.8  [Reviewed]

    DOI

    　More details

    Authorship：Last author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Single Work  

  • High-density spin-wave soliton train

    Eguchi Takuro, Kawase Mikito, Sekiguchi Koji

    APPLIED PHYSICS EXPRESS   15 ( 8 )   2022.7  [Reviewed]

    DOI Web of Science

    　More details

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

  • Propagating backward-volume spin waves in epitaxial Fe films

    Nezu S., Scheike T., Sukegawa H., Sekiguchi K.

    AIP ADVANCES   12 ( 3 )   035320-1 - 035320-6   2022.3  [Reviewed]

    DOI Web of Science

    　More details

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

  • 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

    　More details

    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   2021.5

    DOI CiNii Research

    　More details

    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

display all >>

To the head of this page.▲

Review Papers 【 display / non-display 】

  • The Basis of Magnon Transistors

    K. Sekiguchi

    AAPPS Bulletin 28, 2 (2018).   2018

    DOI

    　More details

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

To the head of this page.▲

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

    　 More details

    Grant type：Competitive

To the head of this page.▲

Presentations 【 display / non-display 】

  • Magnon transistor for next generation computing (invited)

    K. Sekiguchi  [Invited]

    Magnon transistor for next generation computing  MSJ

    　More details

    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

    　More details

    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

    　More details

    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)  

    　More details

    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) 

    　More details

    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)

display all >>

To the head of this page.▲
 

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

  • 2022   Electromagnetism 2

    College of Engineering Science

  • 2022   Electromagnetism 1

    College of Engineering Science

  • 2022   Special Laboratory for Electrical and Computer Engineering

    College of Engineering Science

  • 2022   Laboratory B for Electrical and Computer Engineering

    College of Engineering Science

  • 2022   Laboratory Ⅱ for Electrical and Computer Engineering

    College of Engineering Science

display all >>

To the head of this page.▲