SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 2: Focus Session: Magnon Polarons - Magnon-Phonon Coupling and Spin Transport (joint session MA/HL)
MA 2.4: Talk
Monday, September 27, 2021, 15:00–15:15, H5
enhancement of the spin seebeck effect by magnon-phonon resonance in a partially compensated magnet — •R. Ramos1,2, T. Hioki3,4, Y. Hashimoto1, T. Kikkawa1,3,4, P. Frey5, A.J.E. Kreil5, V.I. Vasyuchka5, A.A. Serga5, B. Hillebrands5, and E. Saitoh1,3,4 — 1WPI AIMR, Tohoku University, Japan — 2CIQUS, Departamento de Química-Física, Universidade de Santiago de Compostela, Spain — 3Department of Applied Physics, The University of Tokyo, Japan. — 4IMR, Tohoku University, Japan — 5Fachbereich Physik and Landesforshungszentrum OPTIMAS, Technische Universität Kaiserslautern, Germany
The spin Seebeck effect (SSE) refers to the generation of a spin current in magnetic materials by the application of a thermal gradient. Recently, the effect of magnon-phonon hybridization, resulting from the crossing of the magnon and phonon dispersions, has been detected in the SSE and named magnon-polaron SSE. This is experimentally observed as spikes of the SSE-voltage at the magnetic field values for which the hybridization between the magnon and phonon dispersions is maximized over k-space. In this talk, we will report the detection of magnon-polaron SSE in a nonmagnetic-ion-substituted garnet system at room temperature and low magnetic fields [1]. The effect is 8 times larger than that observed in a YIG film. We show that the magnon dispersion can be strongly affected by the nonmagnetic-ion substitutions, thus resulting in a clear modification of the magnetic field condition for the observation of magnon-polarons. [1] R. Ramos et al. Nature Comm. 10, 5162 (2019).