Galichyan T.A. «Propagation of elastic waves in bilayer ferrite-piezoelectric structure» Научный мир – Scientific world, № 4, с. J11309-256 (2013)

Structures based on ferrites and piezoelectrics are interesting, because there are effects which can be absent in individual ferrite and piezoelectric components and appears due to mechanical interaction between the ferrite and piezoelectric subsystems. Magnetoelectric (ME) effect is one of such effects, which consists in inducing the electric polarization in an applied magnetic field, or vice versa inducing the magnetization in an applied electric field. ME effect in ferrite-piezoelectric structure is caused by the elastic interaction of magnetostrictive and piezoelectric subsystems. The frequency dependence of the effect is defined by the dispersion relation for such type of waves, because ME effect in composites is caused by the elastic interaction of magnetostrictive and piezoelectric phases. The distribution of elastic waves in bilayer medium significantly differs from the distribution in homogeneous medium. Attempts were made earlier in Ref. [1] to consider ME effect in such structures, but in the same time, a supposition was made, that the amplitude of oscillations was not changing its direction perpendicular to the line of the partition. This suggestion can be used in the description of the effect for rather thin layers, with some accuracy. At more detailed examination this method, used in Ref. [1], reduces to the method of effective parameters, which was first used in describing the frequency dependence of (ME), effect in Refs. [2, 3]. Recently, in Ref. [4], the dispersion relation was obtained for a structure, representing a thin film grown on a semi-infinite substrate. In this paper, the distribution of the elastic waves in bilayer ferrite-piezoelectric structure was investigated given the fact that the amplitude of the wave is changed on the thickness of the sample. The dispersion relation for the elastic waves of acoustic range was obtained. Under the limiting transition it is shown that the dispersion relation, when one of the layers is thinner than the other, passes to a dispersion relation of one, or the other media. http://www.sworld.com.ua/index.php/ru/e-journal/sworld-journal/2227-6920/j113/18463-j11309