Method of a singular point and determination of fields of anisotropy of polycrystalline hexagonal magnets

Abstract

A numerical computation is performed on the magnetization curves and their derivatives for magnets of hexagonal syngony for isotropic polycrystalline specimens as well as materials with “sheet” texture in the basis plane. It is shown that investigation of the second derivatives ∂²M/∂H² for a degree of texture f_T > 0.4 permits obtaining information about the magnitude of the anisotropy field independently of its type. The singularities of M(H) and ∂²M/∂H² are examined for magnetization processes of the first kind. In this case the singular point method permits measuring the magnitude of the critical fields, the critical magnetizations, and the anisotropy field on a textured specimen with f_T>0.7, which yields information about the magnitudes of the high order anisotropy constants in the long run.