title: Stability of Bose-Einstein condensates of hot magnons in yttrium iron garnet films.
abstract: 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.
authors.affiliation: Pacific Institute of Theoretical Physics, University of British Columbia, 6224 Agricultural Road, Vancouver, BC Canada, V6T 1Z1.
authors.forename: I S
authors.initials: IS
authors.lastname: Tupitsyn
authors.forename: P C E
authors.initials: PC
authors.lastname: Stamp
authors.forename: A L
authors.initials: AL
authors.lastname: Burin