The impact of the longitudinal spin Seebeck effect (LSSE) on the magnondamping in magnetic-insulator/nonmagnetic-metal bilayers was recently discussedin several reports. However, results of those experiments can be blurred bymultimode excitation within the measured linewidth. In order to avoid possibleintermodal interference, we investigated the damping of a single magnon groupin a platinum covered Yttrium Iron Garnet (YIG) film by measurement of thethreshold of its parametric excitation. Both dipolar and exchange spin-wavebranches were probed. It turned out that the LSSE-related modification ofspin-wave damping in a micrometer-thick YIG film is too weak to be observed inthe entire range of experimentally accessible wavevectors. At the same time,the change in the mean temperature of the YIG layer, which can appear byapplying a temperature gradient, strongly modifies the damping value.
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