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Giant spin hydrodynamic generation in laminar flow

Author

Listed:
  • R. Takahashi

    (Faculty of Core Research, Ochanomizu University, Otsuka
    Japan Atomic Energy Agency
    ERATO, Japan Science and Technology Agency)

  • H. Chudo

    (Japan Atomic Energy Agency
    ERATO, Japan Science and Technology Agency)

  • M. Matsuo

    (ERATO, Japan Science and Technology Agency
    Tohoku University
    University of Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • K. Harii

    (Japan Atomic Energy Agency
    ERATO, Japan Science and Technology Agency
    National Institutes for Quantum and Radiological Science and Technology)

  • Y. Ohnuma

    (ERATO, Japan Science and Technology Agency
    University of Chinese Academy of Sciences)

  • S. Maekawa

    (Japan Atomic Energy Agency
    ERATO, Japan Science and Technology Agency
    University of Chinese Academy of Sciences
    Riken Center for Emergent Matter Science (CEMS))

  • E. Saitoh

    (Japan Atomic Energy Agency
    ERATO, Japan Science and Technology Agency
    Tohoku University
    Tohoku University)

Abstract

Hydrodynamic motion can generate a flux of electron-spin’s angular momentum via the coupling between fluid rotation and electron spins. Such hydrodynamic generation, called spin hydrodynamic generation (SHDG), has recently attracted attention in a wide range of fields, especially in spintronics. Spintronics deals with spin-mediated interconversion taking place on a micro or nano scale because of the spin-diffusion length scale. To be fully incorporated into the interconversion, SHDG physics should also be established in such a minute scale, where most fluids exhibit a laminar flow. Here, we report electric voltage generation due to the SHDG in a laminar flow of a liquid-metal mercury. The experimental results show a scaling rule unique to the laminar-flow SHDG. Furthermore, its energy conversion efficiency turns out to be about 105 greater than of the turbulent one. Our findings reveal that the laminar-flow SHDG is suitable to downsizing and to extend the coverage of fluid spintronics.

Suggested Citation

  • R. Takahashi & H. Chudo & M. Matsuo & K. Harii & Y. Ohnuma & S. Maekawa & E. Saitoh, 2020. "Giant spin hydrodynamic generation in laminar flow," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16753-0
    DOI: 10.1038/s41467-020-16753-0
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