# Atomistic-continuum multiscale modelling of magnetisation dynamics at non-zero temperature

## TL;DR

This paper discusses multiscale modeling techniques for magnetic materials at finite temperatures, focusing on challenges in accurately capturing magnetization and the limitations of existing methods.

## Contribution

It analyzes two established multiscale approaches and highlights their limitations in modeling temperature-dependent magnetization in spin systems.

## Key findings

- Partitioned domain and upscaling methods are key multiscale concepts.
- Accurate magnetization length capture is challenging due to temperature effects.
- Limitations of current multiscale techniques in spin systems are identified.

## Abstract

In this article, a few problems related to multiscale modelling of magnetic materials at finite temperatures and possible ways of solving these problems are discussed. The discussion is mainly centred around two established multiscale concepts: the partitioned domain and the upscaling-based methodologies. The major challenge for both multiscale methods is to capture the correct value of magnetisation length accurately, which is affected by a random temperature-dependent force. Moreover, general limitations of these multiscale techniques in application to spin systems are discussed.