Magnetism on the thermal dynamics of 2D antiferromagnetic membranes

TL;DR

This paper presents a theoretical model that integrates magnetoelastic effects into the thermal elastic dynamics of 2D antiferromagnetic membranes, predicting observable dependencies across phase transitions.

Contribution

It extends the elastic Grüneisen relation to include magnetic effects and applies the model to FePS3, aligning well with experimental data.

Findings

Effective Grüneisen parameter varies with temperature.

Thermal expansion coefficient shows magnetic influence.

Damping factor depends on magnetic and elastic properties.

Abstract

We developed a theoretical scheme of incorporating the magnetoelastic contribution into the thermal elastic dynamics for the thin membranes of 2D antiferromagnetic material with restricted geometry. We extended the elastic Gr\"uneisen relation into an effective version which includes the magnetic counterpart to the volume change of internal energy. Based on the specific heat and thermal conductivity from the elastic and magnetic origins we predicted the dependency of observables, such as effective Gr\"uneisen parameter, thermal expansion coefficient, and the damping factor, with respect to a wide range of temperature across the phase transition. Our model of analysis as been validated by applying to the case of FePS3 flake resonator and the theoretical predictions fits well with the reported experiment data.