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arXiv · 2610.35153

Temperature-dependent magnetic properties of the antiferromagnet Mn$_2$Au

Jackson L. Ross·Sarah Jenkins·Ricardco Rama-Eiroa·Paul-Iulian Gavriloaea·Jack Collins·Unai Atxitia·Oksana Chubykalo-Fesenko·Karin Everschor-Sitte·Rubén M. Otxoa·Roy W. Chantrell·Richard F. L. Evans
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Abstract

Mn$_2$Au is one of the most promising materials for antiferromagnetic spintronics due to its high Néel temperature, moderate anisotropy, layered spin structure allowing current induced spin-orbit-torques, and ultrafast spin dynamics. Further understanding and control of the magnetic order in Mn$_2$Au for ultrafast spintronics applications via ultrashort electric/optical means requires accurate understanding of how its magnetic properties depend on temperature. Here we present atomistic spin dynamics simulations of the temperature-dependent macroscopic magnetic properties of Mn$_2$Au single crystals. We introduce a spin Hamiltonian based on previous ab initio calculations which produces temperature-dependent scaling of the anisotropy constants with magnetisation consistent with Zener-Akulov-Callen-Callen power laws. The calculated temperature dependence of exchange stiffness follows a scaling law with magnetisation of $m^{1.83}_e$ , and predicts a temperature-dependent domain wall width that agrees very well with direct simulation. Our model provides an understanding of temperature-dependent magnetic properties of Mn$_2$Au that enables large-scale simulation of the working conditions of spintronic devices.

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Jackson L. Ross, Sarah Jenkins, Ricardco Rama-Eiroa, Paul-Iulian Gavriloaea, Jack Collins, Unai Atxitia, Oksana Chubykalo-Fesenko, Karin Everschor-Sitte, Rubén M. Otxoa, Roy W. Chantrell, Richard F. L. Evans. 2026-10-26. Temperature-dependent magnetic properties of the antiferromagnet Mn$_2$Au. https://arxiv.org/abs/2610.35153

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