Magnon Condensation and Spin Superfluidity

We consider the phenomenon of Bose-Einstein condensation of quasi-equilibrium magnons which leads to a spin superfluidity, the coherent quantum transfer of magnetization in magnetic materials. These phenomena are beyond the classical Landau-Lifshitz-Gilbert paradigm. The critical conditions for exci...

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Bibliographic Details
Published in:arXiv.org 2017-12
Main Authors: Bunkov, Yury M, Safonov, Vladimir L
Format: Article
Language:English
Subjects:
Antiferromagnetism
Bulk density
Condensation
Ferromagnetism
Hematite
Magnetic materials
Magnetism
Magnons
Superfluidity
Thin films
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Summary:We consider the phenomenon of Bose-Einstein condensation of quasi-equilibrium magnons which leads to a spin superfluidity, the coherent quantum transfer of magnetization in magnetic materials. These phenomena are beyond the classical Landau-Lifshitz-Gilbert paradigm. The critical conditions for excited magnon density for ferro- and antiferromagnets, bulk and thin films are estimated and discussed. The BEC should occur in the antiferromagnetic hematite at much lower excited magnon density compared to the ferromagnetic YIG.
ISSN:2331-8422
DOI:10.48550/arxiv.1702.00846