Study on the propagation characteristics of SH wave in piemagnetic piezoeletric structures

Abstract

Propagation of SH wave in layered magnetoelectric structure consisting of piezomagnetic layer and piezoelectric substrate is theoretically investigated in this paper. Since the parameters of the piezomagnetic material change with the variety of the external magnetic field, the piezomagnetic material exhibits nonlinearity. The dispersion characteristics of elastic waves propagation in the magnetoelectric composites is more complex and presents many new physical phenomena under different external magnetic field. The elastic parameter, piezomagnetic parameter and permeability of the piezomagnetic material Terfenol-D varied nonlinearly with external magnetic field. Combining with four different electro-magnetic boundary conditions, the dispersion equations of SH wave satisfying quasi-linear wave equations in the Terfenol-D layer and piezoelectric substrate were derived in matrix form. The results show that the SH wave dispersion curves are influenced by external magnetic fields and geometric configurations. Moreover, the elastic displacement, stress, potential and magnetic potential varied with the external magnetic field are presented graphically. It turns out that no matter how the external magnetic field changes, the displacement, stress and potential satisfy the boundary conditions. The research can provide theoretical reference for the applications of piezomagnetic material Terfenol-D in the nonlinear magnetoelectric sensors and engineering.