Temperature dependence of the mean magnon collision time in a spin Seebeck device

Abstract

Based on the relaxation time approximation, the mean collision time for magnon scattering ${\tau }_c(T)$ is computed from the experimental spin Seebeck coefficient of a bulk YIG / Pt bilayer. The scattering results to be composed by two processes: the low temperature one, with a $T^{-1/2}$ dependence, is attributed to the scattering by defects and provides a mean free path around 10 $\mu$m; the high temperature one, depending on $T^{-4}$, is associated to the scattering by other magnons. The results are employed to predict the thickness dependence of the spin Seebeck coefficient for thin films.

arXiv comment13 pages, 4 figures, presented at JEMS 2020, submitted to J.Magn. Magn. Mater

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