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arXiv · 1706.09021

Evidence for the role of the magnon energy relaxation length in the Spin Seebeck Effect

Arati Prakash·Benedetta Flebus·Jack Brangham·Fengyuan Yang·Yaroslav Tserkovnyak·Joseph P. Heremans
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Abstract

Temperature-dependent spin-Seebeck effect data on Pt|YIG (Y$_3$Fe$_5$O$_{12}$)|GGG (Gd$_3$Ga$_5$O$_{12}$) are reported for YIG films of various thicknesses. The effect is reported as a spin-Seebeck resistivity (SSR), the inverse spin-Hall field divided by the heat flux, to circumvent uncertainties about temperature gradients inside the films. The SSR is a non-monotonic function of YIG thickness. A diffusive model for magnon transport demonstrates how these data give evidence for the existence of two distinct length scales in thermal spin transport, a spin diffusion length and a magnon energy relaxation length.

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Arati Prakash, Benedetta Flebus, Jack Brangham, Fengyuan Yang, Yaroslav Tserkovnyak, Joseph P. Heremans. 2017-09-26. Evidence for the role of the magnon energy relaxation length in the Spin Seebeck Effect. https://doi.org/10.1103/physrevb.97.020408

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