Dispersive wave propagation in piezoelectric–piezomagnetic imperfectly bonded media with surface effects based on strain gradient theory

Abstract

This study explores the strain gradient and surface effects on the dispersion behavior of Love waves in piezoelectric–piezomagnetic composite structures. The interface between these two media is imperfectly connected. The dynamic governing equations are derived from the strain gradient electro-magnetoelastic theory by adding characteristic length scale parameters. Maxwell’s equation for the electric and magnetic potential are simultaneously solved across each domain, yielding a comprehensive analytical solution. The dispersion relation is obtained by applying admissible boundary conditions to determine fundamental physical quantities. The key contribution of the present work is to demonstrate the influence of strain gradient parameters, surface parameters, imperfection between the interface, and piezomagnetic substrate properties on the dimensionless phase velocity with respect to the frequency.