Magnon polarons in the spin Seebeck effect

吉川 貴史*; Shen, K.*; Flebus, B.*; Duine, R. A.*; 内田 健一*; Qiu, Z.*; Bauer, G. E. W.*; 齊藤 英治

Physical Review Letters, 117(20), p.207203_1 - 207203_6, 2016/11

https://doi.org/10.1103/PhysRevLett.117.207203

Sharp structures in the magnetic field-dependent spin Seebeck effect (SSE) voltages of Pt/YFeO 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.