Modeling of Hysteresis in Fe–Cu–Nb–Si–B Cores With Transverse Ku

This paper focuses on the modeling of the hysteresis of Fe-Cu-Nb-Si-B nanocrystalline alloys with transverse induced anisotropy Ku based on the behavior of a correlated volume (CV). Only coherent rotation mechanism was considered, given the chosen value of Ku. The formulations account for Ku, the incoherent anisotropy Ki, and the magnetostatic energy. The solving of the equations shows the existence of two kinds of CVs: the first one is responsible for the domain pattern, while the other causes the coercivity. The model has been compared with experimental data, and improved by considering the existence of a minority of CVs featuring strong incoherent anisotropy, causing the coercivity, mingled with classical CVs obeying the random anisotropy model.