Magnon polarons in the spin seebeck effect
Takashi Kikkawa (Tohoku University)
Ka Shen (TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft)
Benedetta Flebus (Universiteit Utrecht)
Rembert A. Duine (Universiteit Utrecht, Eindhoven University of Technology)
Ken Ichi Uchida (Japan Science and Technology Agency, Tohoku University, National Institute for Materials Science)
Zhiyong Qiu (Tohoku University, Japan Science and Technology Agency)
Gerrit E.W. Bauer (Tohoku University, TU Delft - QN/Bauer Group, Kavli institute of nanoscience Delft, Center for Spintronics Research Network)
Eiji Saitoh (Japan Atomic Energy Agency, Japan Science and Technology Agency, Tohoku University)
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Abstract
Sharp structures in the magnetic field-dependent spin Seebeck effect (SSE) voltages of Pt/Y3Fe5O12 at low temperatures are attributed to the magnon-phonon interaction. Experimental results are well reproduced by a Boltzmann theory that includes magnetoelastic coupling. The SSE anomalies coincide with magnetic fields tuned to the threshold of magnon-polaron formation. The effect gives insight into the relative quality of the lattice and magnetization dynamics.
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