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

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, unt...

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Autores principales: Demidov, V. E., Urazhdin, S., Divinskiy, B., Bessonov, V. D., Rinkevich, A. B., Ustinov, V. V., Demokritov, S. O.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5691177/
https://www.ncbi.nlm.nih.gov/pubmed/29146963
http://dx.doi.org/10.1038/s41467-017-01937-y
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author Demidov, V. E.
Urazhdin, S.
Divinskiy, B.
Bessonov, V. D.
Rinkevich, A. B.
Ustinov, V. V.
Demokritov, S. O.
author_facet Demidov, V. E.
Urazhdin, S.
Divinskiy, B.
Bessonov, V. D.
Rinkevich, A. B.
Ustinov, V. V.
Demokritov, S. O.
author_sort Demidov, V. E.
collection PubMed
description 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.
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spelling pubmed-56911772017-11-20 Chemical potential of quasi-equilibrium magnon gas driven by pure spin current Demidov, V. E. Urazhdin, S. Divinskiy, B. Bessonov, V. D. Rinkevich, A. B. Ustinov, V. V. Demokritov, S. O. Nat Commun Article 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. Nature Publishing Group UK 2017-11-17 /pmc/articles/PMC5691177/ /pubmed/29146963 http://dx.doi.org/10.1038/s41467-017-01937-y Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Demidov, V. E.
Urazhdin, S.
Divinskiy, B.
Bessonov, V. D.
Rinkevich, A. B.
Ustinov, V. V.
Demokritov, S. O.
Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title_full Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title_fullStr Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title_full_unstemmed Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title_short Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
title_sort chemical potential of quasi-equilibrium magnon gas driven by pure spin current
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5691177/
https://www.ncbi.nlm.nih.gov/pubmed/29146963
http://dx.doi.org/10.1038/s41467-017-01937-y
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