Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 16: Magnetization and Demagnetization Dynamics I
MA 16.6: Vortrag
Dienstag, 8. März 2016, 11:00–11:15, H34
Influence of a thermal gradient on parametrically excited magnons in YIG-Pt bilayers — Thomas Langner1, •Alexander Serga1, Akihiro Kirihara2, Burkard Hillebrands1, and Vitaliy Vasyuchka1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany, Kaiserslautern, Germany. — 2Smart Energy Research Laboratories, NEC corporation, Tsukuba, Japan.
It has been reported that the Spin Seebeck Effect (SSE) might influence the magnetic damping due to a thermal spin transfer torque mechanism. In this work we investigate the influence of the SSE on the parallel parametric generation of magnons. A modification of the damping parameter due to the SSE would lead to a change in the threshold power. We present investigations on an yttrium iron garnet sample covered by a 5 nm thick platinum film clamped between two separately controlled Peltier elements. The threshold power for the generation of parametrically pumped magnons was measured with respect to the applied external magnetic field, first changing the temperature of the sample homogeneously and in a second step with applied temperature gradient perpendicular to the sample plane where a pronounced longitudinal SSE is present. Precise measurements of the threshold power behavior reveal that there is no measurable influence of the spin Seebeck effect on the parametric excitation threshold in a wide range of magnon wavenumbers, whereas a homogeneous temperature change largely influences this threshold power. Financial support by DFG within SPP 1538 "Spin Caloric Transport" is acknowledged.