Spin Superfluid state at room temperature

摘要

The spin superfluid state was observed in Yttrium Iron Garnet (YIG) at room temperature. It is similar to a Homogeneous Precessing State (HPD), observed early in antiferromagnetic superfluid ~3He-B. The difference between magnon BEC state and spin superfluidity is discussed. The conditions for long distance coherent magnetization transport are highlighted. We explain, why spin superflow does not possible in the case of attractive interaction between magnons, like in in-plain magnetized YIG film.