Stability of Bose-Einstein condensates of hot magnons in yttrium iron garnet films.
We investigate the stability of the recently discovered room-temperature Bose-Einstein condensate (BEC) of magnons in yttrium iron garnet films. We show that magnon-magnon interactions depend strongly on the external field orientation, and that the BEC in current experiments is actually metastable-it only survives because of finite-size effects, and because the BEC density is very low. On the other hand a strong field applied perpendicular to the sample plane leads to a repulsive magnon-magnon interaction; we predict that a high-density room-temperature magnon BEC should then form in this perpendicular field geometry.
Tupitsyn
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Pacific Institute of Theoretical Physics, University of British Columbia, 6224 Agricultural Road, Vancouver, BC Canada, V6T 1Z1.
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Burin
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