Thermomagnonic spin transfer and Peltier effects in insulating magnets

TL;DR

This paper develops a phenomenological and microscopic theory of magnon-mediated energy and magnetization transport in insulating ferromagnets, exploring thermomagnonic effects and their potential for energy applications.

Contribution

It introduces a combined phenomenological and microscopic framework for thermomagnonic effects in insulating magnets, including domain wall motion and heat flow generation.

Findings

Thermal gradients can drive domain wall motion.

Magnetization dynamics can generate heat flows.

Transport coefficients are estimated for specific materials.

Abstract

We study the coupled magnon energy transport and collective magnetization dynamics in ferromagnets with magnetic textures. By constructing a phenomenological theory based on irreversible thermodynamics, we describe motion of domain walls by thermal gradients and generation of heat flows by magnetization dynamics. From microscopic description based on magnon kinetics, we estimate the transport coefficients and analyze the feasibility of energy-related applications in insulating ferromagnets, such as yttrium iron garnet and europium oxide.