Micromagnetics and Multiscale Hysteresis Simulations of Permanent Magnets

Authors: Yangyiwei Yang, Patrick Kühn, Mozhdeh Fathidoost, Bai-Xiang Xu

Confronting the unveiled sophisticated multiscale structural and physical characteristics of hysteresis simulation of permanent magnets, notably samarium-cobalt (Sm-Co) alloy, a novel scheme is proposed linking physics-based micromagnetics on the nanostructure level and magnetostatic homogenization on the mesoscale polycrystal level. Thereby the micromagnetics-informed surrogate hysteron is the key to bridge the scales of nanostructure and polycrystal structure. This hysteron can readily emulate the local magnetization reversal with the nanoscale mechanisms considered, such as nucleation of domains, and domain wall migration and pinning. The overall hysteresis, based on a sintered Sm-Co polycrystal, considering both mesoscale and nanoscale characteristics, is simulated and discussed.