EMAC of Horizontally Polarized Waves in a Conductive Coating on a Dielectric Substrate

Abstract

General expressions have been obtained for elastic displacements that appear in a coating–substrate system due to generation of vibrations by electromagnetic acoustic conversion in the coating by any conversion mechanism. Direct and inverse EMAC in a “thin conductive coating on a dielectric substrate” system has been considered for the magnetostriction–magnetoelastic conversion of vibrations. It has been found that Love waves and SH waves, the velocities of which differ from the classical velocities, are generated in this system. These velocity deviations have been determined for the first mode of Love waves and for the zero mode of SH waves as functions of the thickness and acoustic properties of the coating and substrate. It has been shown that the use of the EMAC provides information that can be employed for contactless estimation of the longitudinal (along the polarizing field) magnetostriction of a coating.