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arXiv · 2509.16884

Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\rm C}$

Hayato Fukushima·Masanori Ichioka·Hiroto Adachi
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Abstract

Spin Seebeck effect refers to the magnonic thermal spin injection from a magnet into the adjacent heavy metal. A ferrimagnetic insulator yttrium iron garnet (YIG) is the material most studied for the spin Seebeck effect. Here, to account for a convex downward temperature dependence of the spin Seebeck effect observed in YIG/Pt system near the Curie temperature $T_{\rm C}$, we develop Ginzburg-Landau theory of the spin Seebeck effect in two-sublattice ferrimagnets. We find that only when we take into account the "N\'{e}el coupling", i.e., interfacial exchange coupling between the N\'{e}el order parameter of YIG and spin accumulation of Pt, the convex downward temperature dependence is explained. The present result sheds light on the importance of the N\'{e}el coupling in ferrimagnetic spintronics.

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Hayato Fukushima, Masanori Ichioka, Hiroto Adachi. 2025-09-21. Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\rm C}$. https://doi.org/10.1103/cwkb-5pwp

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