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. // NATURE COMMUNICATIONS. - 2017. - V. 8, l. .

ISSN/EISSN:

2041-1723 / нет данных

Type:

Article

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.

Author keywords:

BOSE-EINSTEIN CONDENSATION; ROOM-TEMPERATURE; OSCILLATOR DRIVEN

DOI:

10.1038/s41467-017-01937-y

Web of Science ID:

ISI:000415648900011

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	NOV 17
Publisher	NATURE PUBLISHING GROUP
Address	MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
Language	English
Article-Number	1579
Keywords-Plus	BOSE-EINSTEIN CONDENSATION; ROOM-TEMPERATURE; OSCILLATOR DRIVEN
Research-Areas	Science \& Technology - Other Topics
Web-of-Science-Categories	Multidisciplinary Sciences
Author-Email	demidov@uni-muenster.de
Funding-Acknowledgement	Deutsche Forschungsgemeinschaft; NSF {[}ECCS-1509794, DMR-1504449]; Russian Ministry of Education and Science {[}14.Z50.31.0025]
Funding-Text	This work was supported by the Deutsche Forschungsgemeinschaft, the NSF Grant Nos. ECCS-1509794 and DMR-1504449, and the program Megagrant No. 14.Z50.31.0025 of the Russian Ministry of Education and Science.
Number-of-Cited-References	35
Journal-ISO	Nat. Commun.
Doc-Delivery-Number	FN0DX