Tensor Properties of the Magneto-electric Coupling in Hexaferrites

Abstract

Recent data reported on the magneto-electric coupling,α, of hexaferrite materials is very high, and they have the potential to impact future technologies in a major way. The fundamental question addressed in this paper is what does α depend on and, therefore, to what extent can α increase in future experiments. Mathematical formulation of a microscopic theory would be rather complex, especially for a complex crystal structure as the Z-type hexaferrite, for example. We have opted for a thermodynamic argument in which a functional relationship between α and material parameters was derived. We find that α is best described as a tensor property proportional to the product of the magnetostriction and piezoelectric strain tensors. Quantitative estimates of α are given for hexaferrites and composites.

7 Pages

References in corpus (5)

• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
• Ab initio Evidence for Giant Magnetoelectric Responses Driven by Structural Softness
• Magnetoelectric response of multiferroic BiFeO3 and related materials
• Converse Magnetoelectric Experiments on a Room Temperature Spirally Ordered Hexaferrite