Spin Seebeck effect in paramagnets and antiferromagnets at elevated temperatures

Abstract

We develop a theory of the spin Seebeck effect (SSE) in paramagnets as well as in antiferromagnets at elevated temperatures where the classical limit of the fluctuation-dissipation theorem is applicable. Employing dissipative stochastic models that are valid at these temperatures, we calculate the SSE signal, and we find that both the paramagnetic SSE and the antiferromagnetic SSE are expressed by a single equation that is proportional to the external magnetic field times the spin susceptibility of the magnet. The present result suggests the appearance of a cusp structure at the Neel temperature in the antiferromagnetic SSE signal.

arXiv comment10 pages, 4 figures

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• Spin and spin current -- From fundamentals to recent progress
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• Spin Seebeck Effect near the Antiferromagnetic Spin-Flop Transition
• Effects of magnetic anisotropy on spin and thermal transports in classical antiferromagnets on the square lattice
• Mechanism of paramagnetic spin Seebeck effect
• Antiferromagnetic spin Seebeck effect across the spin-flop transition: A stochastic Ginzburg-Landau simulation
• Spin current as a probe of the ${\mathbb{Z}}_2$-vortex topological transition in the classical Heisenberg antiferromagnet on the triangular lattice
• Spin Hall magnetoresistance in paramagnetic NdGaO3
• Spin current injection at magnetic insulator/superconductor interfaces
• Spin Seebeck effect in two-sublattice ferrimagnets in the vicinity of $T_{\mathrm{C}}$
• Ginzburg-Landau theory of spin pumping through an antiferromagnetic layer near the Néel temperature
• Spin Seebeck Effect in Correlated Antiferromagnetic V2O3