Subsonic interfacial (Stoneley) waves in anisotropic multiferroic bimaterials with a viscous interface

The problem of subsonic interfacial (Stoneley) wave propagation in anisotropic multiferroic bimaterials with a viscous interface is treated. A concise analytical method is constructed for deduction of possible subsonic interfacial wave with varying viscosity of the interface. A numerical scheme and several calculations are given based on the method, which demonstrate interesting results. For an interface constructed by a piezoelectric half-space and a piezomagnetic half-space, when assumed to be non-viscous, calculation shows that it does not permit any subsonic interfacial wave. Yet when the same interface is assumed to be viscous, at least one possible subsonic interfacial wave speed appears which varies with the viscosity of the interface. By introducing the relation between viscosity of certain adhesives and temperature, the possibility of control of interfacial wave speeds through accommodating the working temperature is put forward.