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Two recent articles of the Munster University experimental team led by S.O.Demokritov displayed several important facts related to the Bose-Einsteincondensation of magnons (BECM) under permanent pumping first discovered in2006. They contradicted existing theories of this phenomenon, which predict theattractive interaction between magnons and strong spontaneous violation of thereflection symmetry. In this article, we show that these theories implicitlyassumed all relaxation processes to be fast compared with the lifetime of themagnons, whereas one of them -- relaxation between two minima of energy -- isslow. We classify processes responsible for the inter-minima relaxation andpresent their analytic theory. We analyze how the slow inter-minima relaxationmodifies the anticipated properties of a ferromagnet with the magnoncondensate.

Slow inter-minima relaxation and its consequence for BEC of magnons