Textur und anisotropie magnetischer werkstoffe

Abstract

Magnetic and other properties of crystalline substances in many cases are anisotropic, that is, they depend on the crystal direction in which they are being measured. Hence, the corresponding property of a polycrystalline material depends on the orientation distribution or texture of the crystallites in the material. It may be isotropic or anisotropic corresponding to the specific texture present. The orientation distribution function cannot be measured directly. It can, however, be calculated from X-ray or neutron diffraction pole figures by means of a method based on generalized spherical harmonics. The anisotropy of the polycrystalline specimen can be expressed by the texture coefficients obtained and the single crystal constants in a rather simple way. A survey is given on the influence of textures on the anisotropy of different magnetic properties as well as the processes leading to the texture formation in materials.