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The creation of temperature variations in magnetization, and hence in thefrequencies of the magnon spectrum in laser-heated regions of magnetic films,is an important method for studying Bose-Einstein condensation of magnons,magnon supercurrents, Bogoliubov waves, and similar phenomena. In our study, wedemonstrate analytically, numerically, and experimentally that, in addition tothe magnetization variations, it is necessary to consider the connectedvariations of the demagnetizing field. In case of a heat induced local minimumof the saturation magnetization, the combination of these two effects resultsin a local increase in the minimum frequency value of the magnon dispersion atwhich the Bose-Einstein condensate emerges. As a result, a magnon supercurrentdirected away from the hot region is formed.

Local temperature control of magnon frequency and direction of supercurrents in a magnon Bose-Einstein condensate