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Chemical potential of quasi-equilibrium magnon gas driven by pure spin current

Author

Listed:
  • V. E. Demidov

    (Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, Corrensstrasse 2-4)

  • S. Urazhdin

    (Emory University)

  • B. Divinskiy

    (Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, Corrensstrasse 2-4)

  • V. D. Bessonov

    (Institute of Metal Physics, Ural Division of RAS)

  • A. B. Rinkevich

    (Institute of Metal Physics, Ural Division of RAS)

  • V. V. Ustinov

    (Institute of Metal Physics, Ural Division of RAS
    Institute of Natural Sciences, Ural Federal University)

  • S. O. Demokritov

    (Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, Corrensstrasse 2-4
    Institute of Metal Physics, Ural Division of RAS)

Abstract

Pure spin currents provide the possibility to control the magnetization state of conducting and insulating magnetic materials. They allow one to increase or reduce the density of magnons, and achieve coherent dynamic states of magnetization reminiscent of the Bose–Einstein condensation. However, until now there was no direct evidence that the state of the magnon gas subjected to spin current can be treated thermodynamically. Here, we show experimentally that the spin current generated by the spin-Hall effect drives the magnon gas into a quasi-equilibrium state that can be described by the Bose–Einstein statistics. The magnon population function is characterized either by an increased effective chemical potential or by a reduced effective temperature, depending on the spin current polarization. In the former case, the chemical potential can closely approach, at large driving currents, the lowest-energy magnon state, indicating the possibility of spin current-driven Bose–Einstein condensation.

Suggested Citation

  • V. E. Demidov & S. Urazhdin & B. Divinskiy & V. D. Bessonov & A. B. Rinkevich & V. V. Ustinov & S. O. Demokritov, 2017. "Chemical potential of quasi-equilibrium magnon gas driven by pure spin current," Nature Communications, Nature, vol. 8(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01937-y
    DOI: 10.1038/s41467-017-01937-y
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    Cited by:

    1. B. Divinskiy & H. Merbouche & V. E. Demidov & K. O. Nikolaev & L. Soumah & D. Gouéré & R. Lebrun & V. Cros & Jamal Ben Youssef & P. Bortolotti & A. Anane & S. O. Demokritov, 2021. "Evidence for spin current driven Bose-Einstein condensation of magnons," Nature Communications, Nature, vol. 12(1), pages 1-7, December.

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