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Role of Magnon-Magnon Scattering in Magnon Polaron Spin Seebeck Effect
Zhong Shi1,2, Qing Xi1, Junxue Li2
1Shanghai Key Laboratory of Special Artificial Microstructure and School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
Abstract:
The spin Seebeck effect (SSE) signal of magnon polarons in bulk-Y_{3}Fe_{5}O_{12} (YIG)/Pt heterostructures is found to drastically change as a function of temperature. It appears as a dip in the total SSE signal at low temperatures, but as the temperature increases, the dip gradually decreases before turning to a peak. We attribute the observed dip-to-peak transition to the rapid rise of the four-magnon scattering rate. Our analysis provides important insights into the microscopic origin of the hybridized excitations and the overall temperature dependence of the SSE anomalies.
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