Influence of corrosion on the magnetic properties of amorphous and nanocrystalline FeZrNbBCu alloy

 The corrosion resistance of Fe84.8Zr3.4Nb3.4B7.4Cu1 amorphous and nanocrystalline alloy and the effects of corrosion on the soft magnetic properties have been investigated. The corrosion resistance of amorphous sample decreased obviously after partial crystallization, which can be explained by the fact that the uniformity of the passive film was affected and decreased the corrosion resistance for the formation of nanocrystalline embedded in the amorphous. A layer of protective oxides was formed on the surface of the ribbons after corrosion, which leads to the degradation of soft magnetic properties, higher threshold field and higher relaxation frequency. When a small magnetic field was applied, the magnetization process was dominated by the domain wall bulging, and when the applied field was over the threshold field, the magnetization process was dominated by the domain wall bulging and displacement.