HAYASHI Masahiko

写真a

Affiliation

Faculty of Education and Human Studies  Department of School Education  Department of Primary and Secondary Education  Course for Primary and Secondary Education

Homepage URL

http://www.gipc.akita-u.ac.jp/~hayashim/index-en.html

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Research Interests 【 display / non-display 】

  • Theoretical Condensed-Matter Physics

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Graduating School 【 display / non-display 】

  • 1985.04
    -
    1989.03

    The University of Tokyo   Faculty of Science   Department of Physics   Graduated

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Graduate School 【 display / non-display 】

  • 　
    -
    1994.03

    The University of Tokyo  Graduate School, Division of Science  Department of Physics  Doctor's Course  Completed

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Studying abroad experiences 【 display / non-display 】

  • 1996.05
    -
    1997.08

    Delft University of Technology   Post-doctoral researcher

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Campus Career 【 display / non-display 】

  • 2025.04
    -
    Now

    Akita University   Faculty of Education and Human Studies   Department of School Education   Department of Primary and Secondary Education   Course for Primary and Secondary Education   Professor  

  • 2015.04
    -
    2025.03

    Akita University   Faculty of Education and Human Studies   Department of School Education   Combined Courses for English,Mathematics and Science Teachers   Course for Science and Mathematics Teachers   Professor  

  • 2007.04
    -
    2015.03

    Akita University   Abolished organization   Program in Environmental and Mathematical Science   Associate Professor  

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Academic Society Affiliations 【 display / non-display 】

  • 1996.04
    -
    Now
     

    United States

     

    American Physical Society

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Research Areas 【 display / non-display 】

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

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Thesis for a degree 【 display / non-display 】

  • Dynamical Superfluid Density in Vortex State of Type-II Superconductors

    Masahiko Hayashi, Hidetoshi Fukuyama 

    Journal of the Physical Society of Japan  63   3369 - 3391   1994.03

    Domestic Co-author

    The electromagnetic linear response both in the lattice state and liquid state of vortices in type-II superconductors are studied based on the dynamical superfluid density. The calculations are carried out paying special attention to the difference of the internal and the external vector potential. By use of the obtained dynamical superfluid density the static superfluid density, the electric conductivity and the magnetic permeability are studied. A significant difference in responses between the two states is found especially in the Lorentz force free configuration, namely when the supercurrent flows in the direction parallel to the applied magnetic field; the vortex lattice state is superconducting in this direction while the liquid state is not becaue of the vortex entanglement and cutting effects. The magnetic susceptibility, especially in lattice state, has been examined in detail.

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Research Achievements 【 display / non-display 】

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

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2023.04  -  2025.03  Investigator(s): Masahiko Hayashi

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2022.04  -  2025.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2015.04  -  2017.03 

  • Grant-in-Aid for Scientific Research on Priority Areas

    Project Year： 2008.04  -  2010.03 

  • Grant-in-Aid for Scientific Research(C)

    Project Year： 2006.04  -  2009.03 

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Presentations 【 display / non-display 】

  • Numerical Study on Geometry Dependence of Vortex States in Two-Dimensional Type-II Mesoscopic Superconductors

    Hao Yu, Haoyun Liang, Masahiko Hayashi2 Akinobu Kanda

    38th International Symposium on Superconductivity (ISS2025)  2025.12  -  2025.12 

  • Numerical Simulation of Eeffct of Current Injection on Vortex Penetration/expulsion Fields in Mesoscopic Superconductors

    Ayumu Takahashi, Shota Oshiro1, Takumi Mataba1, Masahiko Hayashi, Akinobu Kanda

    38th International Symposium on Superconductivity (ISS2025)  2025.12  -  2025.12 

  • Scanning SQUID microscopy with vector pick-up coils

    Shuichi Kawamata, Masahiko Hayashi, Hiroaki Shishido, The Dang Vu, Takekazu Ishida

    38th International Symposium on Superconductivity (ISS2025)  2025.12  -  2025.12 

  • Fine Tuning of the Inverse Filter for Three-Dimensional Scanning SQUID Microscope

    Masahiko Hayashi, Takekazu Ishida, Hiroaki Shishido, The Dang Vu, Shuichi Kawamata

    38th International Symposium on Superconductivity (ISS2025)  2025.12  -  2025.12 

  • Generation of Vortices by Current Injection into Mesoscopic Superconductors: Numerical Study

    Shota Oshiro, Ayumu Takahashi, Takumi Mataba, Masahiko Hayashi, Akinobu Kanda

    38th International Symposium on Superconductivity (ISS2025)  2025.12  -  2025.12 

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