Directional RF coupler with dual tunability based on laterally coupled multiferroic structure

Abstract

In this work we report the experimental and numerical investigations of spin-electromagnetic waves propagating in finite-width multiferroic waveguide. Numerical simulation was provided by the developped finite-element method of electromagnetic eigenspectrum calculation. The control of electromagnetic spin wave spectra by the variation of dielectric permittivity was demonstrated. We show that the spatial distribution of magnetization of the width-modes in laterally confined multiferroic structure changes due to the electrodynamic coupling between the spin waves localized mainly in the finite-width ferrite layer and the electromagnetic waves propagating in the ferroelectric layer. The proposed structure can be used as tunable microwave coupler.