Atomistic, microstructural and micromagnetic aspects of the multiscale modelling of hysteretic phenomena

TL;DR

This paper introduces a multiscale modeling technique combining first-principles, micromagnetic, and microstructural calculations to analyze hysteresis in hard magnets, focusing on coercivity sources in CoPt magnets.

Contribution

It presents a novel multiscale modeling approach that integrates different computational methods to study hysteretic phenomena in nanoscale magnetic materials.

Findings

Identified two coercivity mechanisms: domain wall pinning and splitting.

Applied the methodology to realistic CoPt microstructures.

Provided insights into the microscopic origins of hysteresis in hard magnets.

Abstract

We formulated a technique which combines the first-principles, micromagnetic and microstructural calculations and allows us to study the nature of hysteretic phenomena in hard magnets. Two distinct sources of coercivity in polytwinned CoPt type magnets, domain wall pinning at antiphase boundaries and splitting at twin boundaries, are illustrated for a realistic microstructure. Methodology of multiscale modelling of hysteretic phenomena in nanoscale magnets is discussed.