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arXiv · 1705.10047

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

V. E. Demidov·S. Urazhdin·B. Divinskiy·V. D. Bessonov·A. B. Rinkevich·V. V. Ustinov·S. O. Demokritov
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Abstract

We show experimentally that the spin current generated by the spin Hall effect drives the magnon gas in a ferromagnet 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.

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V. E. Demidov, S. Urazhdin, B. Divinskiy, V. D. Bessonov, A. B. Rinkevich, V. V. Ustinov, S. O. Demokritov. 2017-05-29. Chemical potential of quasi-equilibrium magnon gas driven by pure spin current. https://doi.org/10.1038/s41467-017-01937-y

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