Surface Magnetoacoustic Waves in Magnetostrictive Media

Abstract

It is known that in absence of external magnetic field it is always possible to excite a surface Love wave in a two-layered medium, whose speed is less than the speed of transverse bulk waves in the substrate and greater than the speed of these bulk waves in the layer. This paper is devoted to the issues of existence and propagation of surface magnetoacoustic waves in layered magnetostrictive half-spaces. It is shown that besides the noted pure elastic waves, the new type of surface magnetoacoustic wave exists, which existence is exclusively conditioned by magnetostrictive properties of medium. It is established that the speed of this new wave can be less than the speed of transverse bulk waves in the layer. It is also established that the new wave propagates with dispersion.