Spin Seebeck effect in antiferromagnets and compensated ferrimagnets

TL;DR

This paper theoretically explores the spin Seebeck effect in antiferromagnets and ferrimagnets, revealing that it vanishes in antiferromagnets but persists in ferrimagnets even at the compensation point due to non-degenerate magnons.

Contribution

It provides a theoretical analysis showing the SSE's behavior in ferrimagnets at the magnetization compensation point, highlighting the role of non-degenerate magnons.

Findings

SSE vanishes in antiferromagnets

SSE persists in ferrimagnets at the compensation point

Magnitude of SSE in ferrimagnets remains unchanged across the compensation point

Abstract

We theoretically investigate the spin Seebeck effect (SSE) in antiferromagnets and ferrimagnets, and show that the SSE vanishes in antiferromagnets but survives in ferrimagnets even at the magnetization compensation point despite the absence of its saturation magnetization. The non-vanishing SSE in ferrimagnets stems from two non-degenerate magnons. We demonstrate that the magnitude of the SSE in ferrimagnets is unchanged across the magnetization compensation point.