Abstract
The magnetization processes in amorphous ferromagnetic alloys were studied by the hyperbolic model of hysteresis. The measured hysteresis data were used for separation of the domain wall movement, domain rotation and domain wall annihilation and nucleation process during decreasing of the excitation magnetic field. The external applied tensile stress was used as a parameter. Our results show that the process of the domain rotation is the most sensitive for the applied stress. The corresponding magnetization energy decreases with increasing of the mechanical stress for all our studied samples with the positive magnetostriction coefficient.
Highlights
The using of soft ferromagnetic materials in industrial praxis needs the knowledge about the mechanism of magnetization and demagnetization processes
This is why, we have used for fitting calculations n=3 throughout this work taking into account all the three magnetization processes: domain wall movement (DWM), domain rotation (DR) and domain wall annihilation and nucleation (DWAN)
Considering the three components, the two step-like DWM and DWAN components will show little area between the steep M(H) line and the vertical axis, which is hardly affected by the stress induced anisotropy, whereas the more flat DR component will show a large and decreasing reversible energy of magnetization as a function of σ
Summary
The using of soft ferromagnetic materials (amorphous or nanocrystalline) in industrial praxis (as cores for transformers, sensors, and so on) needs the knowledge about the mechanism of magnetization and demagnetization processes. The hysteresis models [1,2,3,4] published so far are based on the separate domain wall movement with domain wall pinning coercivity and domain rotation processes working against an effective anisotropy field. We have tried to use this overlapping model for study of the magnetization processes in FeB-based amorphous ribbons magnetized under applied tensile stress.
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