Separation of susceptibility mechanisms for ferrites of low anisotropy

A method of separation of the mechanisms of initial susceptibility, based on the variations of the susceptibility with grain size, is proposed. For this purpose an earlier proposed model is used together with the conclusions drawn from a long study on the role of intergranular porosity which proved the independence of the susceptibility over this factor. The data on the movement of the walls are thus obtained. Furthermore, rotational susceptibility affords access to effective anisotropy, which is higher than it is generally supposed to be for materials of high susceptibility. Finally the method of separation is applied to YIG.