Excitation of two spatially separated Bose-Einstein condensates of magnons

Dzyapko O, Demidov VE, Buchmeier M, Stockhoff T, Schmitz G, Melkov GA, Demokritov SO

Abstract

We have studied experimentally the spatial properties and the dynamics of magnon Bose-Einstein condensates created in ferromagnetic films by a parametric pumping with different spatial configurations. Using the specific character of dynamic fields produced by pumping resonators of different shapes, we were able to realize the regime, in which two spatially separated condensates of magnons are formed. Our experiments show that while the separation between the condensates is determined by the size of the resonator, their spatial width can be changed by varying the power of the pumping signal.