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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.20: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Damping of parametrically excited magnons in the presence of the longitudinal spin Seebeck effect — •Thomas Langner1, Akihiro Kirihara2, Alexander A. Serga1, Burkard Hillebrands1, and Vitaliy I. Vasyuchka1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany — 2IoT Devices Research Laboratories, NEC Corporation, Tsukuba, Japan
The impact of the longitudinal spin Seebeck effect (LSSE) on the magnon damping in magnetic-insulator/nonmagnetic-metal bilayers was recently discussed in several reports. However, results of those experiments can be blurred by multimode excitation within the measured linewidth. In order to avoid possible intermodal interference, we investigated the damping of a single magnon group in a platinum covered Yttrium Iron Garnet (YIG) film by measurement of the threshold of its parametric excitation. Both dipolar and exchange spin-wave branches were probed. It turned out that the LSSE-related modification of spin-wave damping in a micrometer-thick YIG film is too weak to be observed in the entire range of experimentally accessible wavevectors. At the same time, the change in the mean temperature of the YIG layer, which can appear by applying a temperature gradient, strongly modifies the damping value. Financial support by DFG within SPP 1538 "Spin Caloric Transport" is gratefully acknowledged.