Magnon polarons in the spin Seebeck effect

Kikkawa, Takashi*; Shen, K.*; Flebus, B.*; Duine, R. A.*; Uchida, Kenichi*; Qiu, Z.*; Bauer, G. E. W.*; Saito, Eiji

Sharp structures in the magnetic field-dependent spin Seebeck effect (SSE) voltages of Pt/Y $_{3}$ Fe $_{5}$ O $_{12}$ 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.

Language	:	English
Journal	:	Physical Review Letters
Volume	:	117
Number	:	20
Pages	:	p.207203_1 - 207203_6
Publication Year/Month	:	2016/11
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Paper URL	:	https://doi.org/10.1103/PhysRevLett.117.207203
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Keywords	:	no keyword
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Registration No. : AA20170338
JAEA Abstracts No. : 45001335
Paper Submission No. : 19561

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