Transformation of eigenmodes spectrum of finite width multiferroic structure due to tuning of the gap between ferrite and ferroelectric layers

We consider a layered multiferroic structure consists of laterally confined ferrite and ferroelectric layers. We study the influence of the air gap between the layers on properties of transverse modes of hybrid waves. By the solution of the electrodynamic problem with the finite element method we show that with increasing of distance between the ferrite and ferroelectric layer the coupling between the waves of these partial systems weakened. These results can be used to explain the experimental data obtained on the layered structure. In the fabrication process of such structures the air gap between the layers may appear. The artificial weakening of the interaction of waves is also useful for a detailed study of the impact of the phenomenon of hybridization on the separate transverse modes.