Experimental analysis reveals a temperature-driven dip-to-peak transition in YIG/Pt spin Seebeck signals, suggesting four-magnon scattering drives hybridized excitation dynamics.
The spin Seebeck effect (SSE) signal of magnon polarons in bulk-Y3Fe5O12 (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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Zhong et al. (2021) studied this question.
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