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arXiv · 1804.02172

Magnons versus electrons in thermal spin transport through metallic interfaces

Maarten Beens·Joseph P. Heremans·Yaroslav Tserkovnyak·R. A. Duine
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Abstract

We develop a theory for spin transport in magnetic metals that treats the contribution of magnons and electrons on equal footing. As an application we consider thermally-driven spin injection across an interface between a magnetic metal and a normal metal, i.e., the spin-dependent Seebeck effect. We show that the ratio between magnonic and electronic contribution scales as $\sqrt{T/T_C}T_F/T_C$, with the Fermi temperature $T_F$ and the Curie temperature $T_C$. Since, typically, $T_C \ll T_F$, the magnonic contribution may dominate the thermal spin injection, even though the interface is more transparent for electronic spin current.

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Maarten Beens, Joseph P. Heremans, Yaroslav Tserkovnyak, R. A. Duine. 2018-04-06. Magnons versus electrons in thermal spin transport through metallic interfaces. https://doi.org/10.1088/1361-6463/aad520

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