Schweizer, MatthiasMatthiasSchweizerKühn, FranziskaFranziskaKühnL'vov, VictorVictorL'vovPomyalov, AnnaAnnaPomyalovFreymann, Georg vonGeorg vonFreymannHillebrands, BurkardBurkardHillebrandsSerga, Alexander A.Alexander A.Serga2024-08-062024-08-062024https://publica.fraunhofer.de/handle/publica/47284710.1063/5.0189154The creation of temperature variations in magnetization, and hence in the frequencies 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, we demonstrate analytically, numerically, and experimentally that, in addition to the magnetization variations, it is necessary to consider the connected variations of the demagnetizing field. In the case of a heat-induced local minimum of the saturation magnetization, the combination of these two effects results in a local increase in the minimum frequency value of the magnon dispersion at which the Bose-Einstein condensate emerges. As a result, a magnon supercurrent directed away from the hot region is formed.entemperature variations in magnetizationhence in the frequenciesBose-Einstein condensation of magnonsmagnon supercurrentsBogoliubov waves, and similar phenomenaDDC::500 Naturwissenschaften und Mathematikjournal article