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 K-u based on the behavior of a correlated volume (CV). Only coherent rotation mechanism was considered, given the chosen value of K-u. The formulations account for K-u, the incoherent anisotropy K-i, 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.