Frequency and magnetic field dependences of coercivity and core loss in Fe-Mo-Si-P-C-B amorphous alloys

Relations of the coercivity (H_c) and core loss (P) with the frequency (f) as well as the magnetic field (H₀) or the maximum induction (B_m) of Fe-Mo-Si-P-C-B amorphous alloys were investigated. The coercivities and core losses of the Fe-based amorphous alloys were determined by the measurements of dynamic magnetization curves, as functions of frequency (f = 50-1000 Hz) and amplitude (H₀ = 0-600 A/m) of applied field. The coercivities and core losses were fitted by a power law dependence of the frequency and amplitude of applied field as well as the maximum induction respectively. The results indicated that the coercivity and core loss of the Fe-based amorphous alloys significantly depended on the frequency and magnetic field (induction) as well as intrinsic parameters.