Mathematical model of partially oriented polycrystalline hexaferrite

The properties of partially oriented polycrystalline hexaferrites are discussed using a model that allows for misalignment of the grain axes relative to an orientation axis. The remanent magnetization and the recoil magnetization curve (measured with a decreasing field, starting at a sufficiently high field) are calculated from the distribution of misalignment angles. In its simplest forms, the theory has three adjustable parameters that usually have to be determined from an analysis of experimental data: the net saturation magnetization, the anisotropy field and the maximum misalignment angle. Methods for extracting these parameters from experimental data are described