Effect of stress annealing on permeability and magnetic domains of FeCuSiBNbMn(Mo) amorphous alloys

The impact of stress annealing on the permeability, static and dynamic magnetic domains, as well as magnetization behavior has been studied in Fe₇₄Si₁₃B₈Nb₂Cu₁Mn₂ and Fe₇₆Si₁₃B₈Nb_1.5Cu₁Mo_0.5 amorphous alloys. Increasing the stress-annealing temperatures for FeSiBNbCuMn alloys leads to a decrease in domain width and an enhancement of magnetization rotation, which results in a reduction of permeability and an improvement in frequency stability. Moreover, FeSiBNbCuMo samples’ stress annealed under tensile force of 7 ~ 10 N exhibit a significant stress-annealing-induced anisotropy (K_u) of several hundred J/m³, maintaining a constant permeability of 340 to 1720 at frequencies ranging from 1 kHz to 50 MHz. Furthermore, a relationship between tensile force, permeability, induced anisotropy, and domain width is established. These findings provide a valuable guide for enhancing frequency stability of permeability by adjusting anisotropy and dynamic domain structure.