横浜国立大学 理工学部/理工学府　関口研究室　スピントロニクス研究室

主な学術論文

∼ 2024年度 ∼

  • Shoki Nezu, Thomas Scheike, Hiroaki Sukegawa, and Koji Sekiguchi,
    Unconventional parametric spin-wave pumping in single-crystal iron films,
    Physical Review B 109, 184402 (2024)
    doi.org/10.1103/PhysRevB.109.184402
    Editors' Suggestion

    • ∼ 2023年度 ∼

  • Ryo Furukawa, Shoki Nezu, Takuro Eguchi and Koji Sekiguchi,
    Mode-dependent magnonic noise,
    NPG Asia Materials 16, article number:2 (2024)
    doi.org/10.1038/s41427-023-00522-8[OPEN ACCESS]
  • Masashi Iwaba, Koji Sekiguchi,
    Spin-wave enhancement using feedback-ring structure,
    Japanese Journal of Applied Physics (Regular Paper) 62, 103001 (2023).
    doi.org/10.35848/1347-4065/acf79d

    • ∼ 2022年度 ∼

  • Takuro Eguchi, Mikito Kawase, and Koji Sekiguchi,
    High-density spin-wave soliton train,
    Applied Physics Express 15, 083001 (2022)
    doi.org/10.35848/1882-0786/ac7ead
  • Takuro Eguchi, Shoki Nezu, Yu Naemura, and Koji Sekiguchi,
    Spin-wave interconversion via thermoelectric point-contact control,
    Physical Review Research 4, 033135 (2022)
    doi.org/10.1103/PhysRevResearch.4.033135[OPEN ACCESS]
  • Shoki Nezu, Thomas Scheike, Hiroaki Sukegawa and Koji Sekiguchi,
    Propagating backward-volume spin waves in epitaxial Fe films,
    AIP Advances 12, 035320 (2022).
    doi.org/10.1063/9.0000258

    • ∼ 2021年度 ∼

  • 根津昇輝,　関口康爾
    多磁区状態の強磁性薄膜におけるスピン波伝播の外部磁場依存性,
    T. Magn. Soc. Jpn. (Special Issues)., 5, 6-9 (2021)
    doi.org/10.20819/msjtmsj.21TR305[OPEN ACCESS]
  • M. Iwaba, K. Sekiguchi,
    Spin-wave switching using a dynamic magnonic crystal,
    Applied Physics Express 14, 073002 (2021).
    doi.org/10.35848/1882-0786/ac0677

    • ∼ 2020年度 ∼

  • 岩場雅司,　藤原早希 ,　関口康爾
    ダブル・マグノニック結晶を用いたバックワードスピン波遮断（2020）,
    MSJ論文奨励賞を受賞しました。
    doi.org/10.20819/msjtmsj.20TR409[OPEN ACCESS]
  • M. Kawase, M. Iwaba and K. Sekiguchi,
    Electric detection of nonlinear effect upon spin-wave spin current,
    Japanese Journal of Applied Physics (Regular Paper) 59 , ab6508 (2020).
    doi.org/10.7567/1347-4065/ab6508
  • T. Tachizaki, H. Mizuno, and K. Sekiguchi,
    Numerical study on the enhancement of the magneto-optic Kerr effect using a dielectric thin film,
    Japanese Journal of Applied Physics (Regular Paper) 59 , ab658c (2020).
    doi.org/10.7567/1347-4065/ab6508c

    ∼ 2019年度 ∼

  • T. Goto, T. Yoshimoto, B. Iwamoto, K. Shimada, C. A. Ross, K. Sekiguchi, A. B. Granovsky, Y. Nakamura, H. Uchida and M. Inoue,
    Three port logic gate using forward volume spin wave interference in a thin yttrium iron garnet film,
    Scientific Reports 9, 16472 (2019).
    doi:10.1038/s41598-019-52889-w [OPEN ACCESS]

    ∼ 2018年度 ∼

  • K. Sekiguchi, D. Chiba, and T. Tachizaki,
    Time-domain propagating spin-wave spectroscopy for forward spin waves in a ferromagnetic metal,
    Japanese Journal of Applied Physics (SELECTED TOPICS IN APPLIED PHYSICS) 57, 0902B4 (2018).
    doi.org/10.7567/JJAP.57.0902B4 [Free Article]
  • K. Sekiguchi,
    The Basis of Magnon Transistors,
    AAPPS Bulletin 28, 2 (2018).
    doi: 10.22661/AAPPSBL.2018.28.3.02 [OPEN ACCESS]

    ∼ 2017年度 ∼

  • K. Sekiguchi, S-W. Lee, H. Sukegawa, N. Sato, S.-H. Oh, R. D. McMichael, and K. J. Lee,
    Spin-wave propagation in cubic anisotropic materials,
    NPG Asia Materials 9, e392 (2017).
    doi:10.1038/am.2017.87 [OPEN ACCESS]
  • N. Kanazawa, T. Goto, K. Sekiguchi, A. B. Granovsky, C. A. Ross, H. Takagi, Y. Nakamura, H. Uchida and M. Inoue,
    The role of Snell's law for a magnonic majority gate,
    Scientific Reports 7, 7898 (2017).
    doi:10.1038/s41598-017-08114-7 [OPEN ACCESS]
  • N. Sato, S.-W. Lee, K.-J. Lee and K. Sekiguchi,
    Current-induced modulation of backward spin-waves in metallic microstructures,
    Journal of Physics D: Applied Physics 50, 094004 (2017).
    doi.org/10.1088/1361-6463/aa59d2

    ∼ 2016年度 ∼

  • N. Sato, S.-J. Lee, S.-W. Lee, K.- J. Lee, and K. Sekiguchi,
    Phase stability of magnonic logic operation in microfabricated metallic wires,
    Applied Physics Express 9, 083001 (2016).
    doi.org/10.7567/APEX.9.083001
  • N. Kanazawa, T. Goto, K. Sekiguchi, A. B. Granovsky, H. Takagi, Y. Nakamura, and M. Inoue,
    Spin wave absorber generated by artificial surface anisotropy for spin wave device network
    AIP Advance 6, 095204 (2016).
    doi.org/10.1063/1.4962664 [OPEN ACCESS]
  • N. Kanazawa, T. Goto, K. Sekiguchi, A. B. Granovsky, C. A. Ross, H. Takagi, Y. Nakamura, and M. Inoue,
    Demonstration of a robust magnonic spin wave interferometer,
    Scientific Reports 6, 30268 (2016).
    doi:10.1038/srep30268 [OPEN ACCESS]

    ∼ 2015年度 ∼

  • M. Goto, et.al., and K. Sekiguchi,
    Criteria for electric determination of anti-vortex creation in ferromagnetic thin film,
    Japanese Journal of Applied Physics 54, 023001 (2015).
    doi.org/10.7567/JJAP.54.023001
  • T. Goto, N. Kanazawa, A. Buyandalai, H. Takagi, Y. Nakamura, S. Okajima, T. Hasegawa, A. B. Granovsky, K. Sekiguchi, C. A. Ross, and M. Inoue,
    Spin wave differential circuit for realization of thermally stable magnonic sensors,
    Applied Physics Letters 106, 132412 (2015).
    doi.org/10.1063/1.4916989

    ∼ 2014年度 ∼

  • N. Sato, N. Ishida, T. Kawakami, and K. Sekiguchi,
    Propagating spectroscopy of backward volume spin wave in a metallic FeNi film,
    Applied Physics Letters 104, 032411 (2014).
    doi.org/10.1063/1.4863215
  • N. Sato, and K. Sekiguchi,
    Electrical Demonstration of Spin-Wave Logic Operation,
    Applied Physics Express 6, 063001 (2014).
    doi.org/10.7567/APEX.6.063001[SPOTLIGHT PAPERS]

    ∼ 2013年度 ∼

  • N. Sato, and K. Sekiguchi,
    Excitation of Continuous Magnetostatic Surface Spin Wave in Ferromagnetic Thin Films,
    Journal of Magnetics Society of Japan 37, 214 (2013).
    doi.org/10.3379/msjmag.1305R006[OPEN ACCESS]
  • K. Nakano, K. Tanabe, R.Hiramatsu, D.Chiba, N. Ohshima, S. Kasai, T. Sato, Y. Nakatani, K. Sekiguchi, K. Kobayashi, and T. Ono
    Real-time observation of electrical vortex core switching,
    Applied Physics Letters 102, 072405 (2013).
    doi.org/10.1063/1.4793212

    ∼ 2012年度 ∼

  • K. Sekiguchi, T. N. Vader, K. Yamada, S. Fukami, N. Ishiwata, S.-M. Seo, S.-W. Lee, K.-J. Lee, T. Ono,
    Attenuation of propagating spin wave induced by layered nano structures,
    Applied Physics Letters 100, 132411 (2012).
    doi.org/10.1063/1.3699020
  • K. Sekiguchi, K.Yamada, S.-M. Seo, K.-J. Lee, D. Chiba, K. Kobayashi, and T. Ono,
    Time-Domain Measurement of Current-Induced Spin Wave Dynamics,
    Physical Review Letters 108, 017203(2012).
    doi.org/10.1103/PhysRevLett.108.017203

    ∼ 2011年度 ∼

  • K. Nakano, D. Chiba, N. Ohshima, S. Kasai, T. Sato, Y. Nakatani, K. Sekiguchi, K. Kobayashi, and T. Ono,
    All-electrical operation of magnetic vortex core memory cell,
    Applied Physics Letters 99, 262505 (2011).
    doi:10.1063/1.3673303
  • Y. Yamauchi, K. Sekiguchi, K. Chida, T. Arakawa, S. Nakamura, K. Kobayashi, T. Ono, T. Fujii, and R. Sakano,
    Evolution of the Kondo effect in a quantum dot probed by shot noise,
    Physical Review Letters 106, 176601 (2011).
    10.1103/PhysRevLett.106.176601
  • T. Arakawa, K. Sekiguchi, S. Nakamura, K. Chida, K. Kobayashi, A. Fukushima, S. Yuasa, and T. Ono,
    Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based junctions magnetic tunnel,
    Applied Physics Letters 98, 202103 (2011).
    doi.org/10.1063/1.3590921

    ∼ 2010年度 ∼

  • K. Sekiguchi, T. Arakawa, Y. Yamauchi, K. Chida, M. Yamada, H. Takahashi, D. Chiba, K. Kobayashi and T. Ono
    Observation of full shot noise in CoFeB/MgO /CoFeB based magnetic tunnel junctions,
    Applied Physics Letters 96, 252504 (2010).
    doi.org/10.1063/1.3456548
  • K. Sekiguchi, K. Yamada, S. M. Seo, K. J. Lee, D. Chiba, K. Kobayashi, and T. Ono,
    Nonreciprocal emission of spin-wave packet in FeNi film,
    Applied Physics Letters 97, 022508 (2010).
    doi:10.1063/1.3464569
  • K. Nakano, D. Chiba, K. Sekiguchi, S. Kasai, N. Ohshima, K. Kobayashi, and T. Ono,
    Electrical detection of vortex core polarity in ferromagnetic disk,
    Applied Physics Express 3, 053001 (2010).
    doi.org/10.1143/APEX.3.053001

    ∼ 2008年度 ∼

  • K. Sekiguchi, A.Yamaguchi, H. Miyajima, and A. Hirohata,
    Effect of Ferromagnetism on AB oscillations in a Normal-Metal Ring,
    Physical Review B rapid communications 77, 140401 (2008).
    doi.org/10.1103/PhysRevB.77.140401
  • K. Sekiguchi, A. Yamaguchi, H. Miyajima, A. Hirohata, and S. Usui,
    Observation of a bias- dependent constrained mag- netic wall in a Ni point contact,
    Physical Review B 78, 224418 (2008).
    doi.org/10.1103/PhysRevB.78.224418

    • 主なアウトリーチ



  • 関口康爾, 介川裕章
    マグノントランジスタに新展開－スピン波素子の高効率化と集積化を可能にし、実用化に道筋－(2017),
    [マグノントランジスタに新展開], 日本経済産業新聞, 日本経済新聞(web), オプトロニクス(web), つくばサイエンスニュース(web), などに掲載されました。

  • 後藤太一、関口康爾
    磁気の性質を使って論理演算を実現～電流を流さない新しいコンピューターが期待～(2017),
    [磁気の性質を使って論理演算を実現], 日本経済新聞(web), オプトロニクス(web), マイナビニュース(web), などに掲載されました。

  • 後藤太一、関口康爾
    スピン波を使った世界最高性能の位相干渉器の開発(2016),
    [スピン波を使った世界最高性能の位相干渉器の開発], オプトロニクス(web), などに掲載されました。

  • 関口康爾,
    磁気による演算素子原理の証明—高性能、省電力の画期的コンピューターにつながる基盤技術の開拓—(2013),
    [磁気による演算素子原理の証明], 日本経済新聞, 日本経済産業新聞, 日刊工業新聞, 化学工業新聞, 朝日新聞デジタル、などに掲載されました。