Abstract
The effects of Co substitution on the magnetization process of nanocrystalline Fe–Nb–B alloys have been investigated by complex permeability spectroscopy in a frequency range from 1 Hz to 1.8 GHz. It is found that substitution of Co results in a magnetic hardening marked by a drop in initial permeability μ i and a rise in relaxation frequency f 0. The deterioration of soft magnetic property is accelerated with the increase of the extent of Co substitution. This is attributed to more pinning sites of domain walls in the material which is produced after the substitution of Co. Under various AC magnetic fields, domain wall motion is the main mechanism in the magnetization process. Permeability spectra reveal that domain wall motion includes domain wall bulging and domain wall displacement.
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