Spin Seebeck effect in paramagnets and antiferromagnets at elevated temperatures

Yutaka Yamamoto, Masanori Ichioka, Hiroto Adachi

Published 2019-06-10Version 1

We develop a theory of the spin Seebeck effect (SSE) in paramagnets as well as in antiferromagnets at elevated temperatures. Employing dissipative stochastic models that are valid at elevated temperatures, we calculate the SSE signal, and find that both the paramagnetic SSE and the antiferromagnetic SSE are expressed by a single equation which 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.