Magnetic-Coupling Properties in Polycrystals

Abstract

Quantitative Texture Analysis procedures for characterisation of polycrystal pyromagnetic, magnetoelectric and piezomagnetic effects are proposed. The considered phenomena link the thermic, electric and elastic subsystems of a given body with its magnetic subsystem. Brief resumes of required thermodynamic, tensor and texture methods are given. Peculiar behaviour of magnetic (axial-tensor) quantities under colour symmetry operations is described. The use of Neumann's Principle in the investigation of the considered effects is discussed. Surface representation of magnetic-coupling properties is analysed in detail. Colour symmetry, combined with the axial nature of the related tensors, determines the shapes of properties' surfaces. Bunge's spherical harmonics treatment of surface representations is adapted to axial-tensor cases. Computer-generated cases of pyromagnetic, magnetoelectrie and piezomagnetic textures are solved.