I have used a few codes for studying magnetic materials (specifically core-shell nanoparticles with an AFM shell and an FM core). These are:
Vampire: For the calculation of curie temperature via Magnetisation-Temperature curve simulations;
Mumax3: For Micromagnetics simulations; and
Vegas: This is an old package using the heisenberg model. [I havent been able to use this due to compilation issues].
Are there any other software packages? I have also heard of OOMMF, Ubermag and others but I'm not familiar with them. So it would be nice if anyone could shed some light on the main use cases (what kind simulations could be easily done using such software).
Thanks in advance :)