Domain walls and a wall-pinning effect in amorphous magnetic materials

The wall thickness and the initial susceptibility as well as the coercivity of amorphous magnetic material were calculated on a simple theory concerned with the micro-structure-magnetic anisotropies in it. It is indicated that for amorphous materials the domain patterns observed by Bitter method can be incomplete. It is pointed out that the complication and irregularity of domain configurations and the inhomogeneity of anisotropies in as-prepared amorphous materials are two important reasons for their initial susceptibility to be rather low. It is expected that some of amorphous magnetic materials do not have a clear Hopkinson phenomenon. It is shown that the wall-pinning effect by the gradient of microstructure-magnetic anisotropies is a main mechanism forming the coercivity of amorphous soft-magnetic material, the effects of thermal treatments on the technical magnetic properties of amorphous material are distinct. All the results presented show agreement with experimental data.