In this paper, we demonstrate how altermagnets can be simulated in the recently released micromagnetic simulation package mumax+. We have added a new magnet class for d-wave altermagnets and demonstrate how mumax+ is able to reproduce the analytical solutions for line profiles of the N\'eel vector and net magnetization for a Bloch domain wall. Next, we show simulation results of the magnon dispersion relation and its dependence on the anisotropic nature of the exchange interaction. Finally, we study the motion of a N\'eel skyrmion by applying a spin transfer torque. This new feature was implemented by extending the pre-existing code base for antiferromagnetic simulations. The object-oriented design of mumax+ allows for a correct calculation of the magnetostatic field in multi-sublattice systems, a feature that many other micromagnetic simulators lack.
Cite
@article{arxiv.2604.15454,
title = {Simulating altermagnets using mumax+},
author = {Lars Moreels and Nicolai Bechler and Bartel Van Waeyenberge and Jonathan Leliaert and Jan Masell},
journal= {arXiv preprint arXiv:2604.15454},
year = {2026}
}