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arXiv · 2101.04405

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

Vittorio Basso·Alessandro Sola·Patrizio Ansalone·Michaela Kuepferling
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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.

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Vittorio Basso, Alessandro Sola, Patrizio Ansalone, Michaela Kuepferling. 2021-01-12. Temperature dependence of the mean magnon collision time in a spin Seebeck device. https://doi.org/10.1016/j.jmmm.2021.168289

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