Thermally induced magnon accumulation in two-sublattice magnets

TL;DR

This study investigates how temperature variations induce magnonic spin currents in two-sublattice magnetic materials, revealing that the excitation strength correlates with the temperature derivative of magnetization.

Contribution

It provides a temperature-dependent analysis of magnonic spin current excitation in antiferromagnets and ferrimagnets using atomistic spin model simulations, highlighting the role of magnetization derivatives.

Findings

Magnon excitation scales with the derivative of magnetization with respect to temperature.

Local magnetization profiles near temperature steps show significant variations.

The study applies to antiferromagnetic and ferrimagnetic materials.

Abstract

We present a temperature dependent study of the thermal excitation of magnonic spin currents in two-sublattice magnetic materials. Using atomistic spin model simulations, we study the local magnetization profiles in the vicinity of a temperature step in antiferromagnets, as well as in ferrimagnets. It is shown that the strength of the excitation of the spin currents in these systems scales with the derivative of the magnetization with respect to the temperature.