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MA: Fachverband Magnetismus
MA 2: Focus Session: Magnon Polarons - Magnon-Phonon Coupling and Spin Transport (joint session MA/HL)
MA 2.8: Vortrag
Montag, 27. September 2021, 16:45–17:00, H5
Revealing thermally driven distortion of magnon dispersion by spin Seebeck effect in Gd3Fe5O12 — •Bin Yang1, Si Yu Xia1, Hui Zhao1, Gan Liu1, Jun Du1, Ka Shen2, Zhiyong Qiu3, and Di Wu1 — 1National Laboratory of Solid State Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, Collaborative Innovation Center of Advanced Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China — 2Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China — 3School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
We report a systematic study of the temperature and field dependences of the spin Seebeck effect (SSE) in a bilayer of Pt/Gd3Fe5O12. An anomalous structure is observed in the magnetic field dependent measurements at temperatures between ~60 and ~210 K.We attribute these anomalies to the contribution from the quasiparticles hybridized between the Gd moment dominated spin wave (α mode) and the transversal acoustic phonon, known as the magnon polarons, and explain these rich phenomena by an increase of the group velocity of the α-mode magnon with increasing temperature and the nonparabolic magnon dispersion of Gd3Fe5O12. Our results demonstrate that the magnon polaron induced SSE is helpful for the investigation of the magnon dispersion evolution with a simple transport approach.