# Quantum thermodynamics of complex ferrimagnets

## TL;DR

This paper uses a quantum thermostat in atomistic spin dynamics to accurately compute thermodynamic properties of complex ferrimagnet YIG across temperatures, revealing significant deviations from classical models but aligning with experiments.

## Contribution

It introduces a quantum thermostat approach to simulate thermodynamics of complex ferrimagnets like YIG, improving accuracy over classical models.

## Key findings

- Computed magnon power spectrum and specific heat of YIG across temperatures.
- Results show significant differences from classical models.
- Findings agree with experimental data.

## Abstract

High-quality magnets such as yttrium iron garnet (YIG) are electrically insulating and very complex. By implementing a quantum thermostat into atomistic spin dynamics we compute YIG's key thermodynamic properties, viz. the magnon power spectrum and specific heat, for a large temperature range. The results differ (sometimes spectacularly) from simple models and classical statistics, but agree with available experimental data.