Nonlinear magnetostatic surface waves in a gyromagnetic film

Abstract

The general dispersion relation for strongly nonlinear magnetostatic surface waves in a gyromagnetic (yttrium iron garnet) film, bounded by a nonlinear dielectric cover, and a linear dielectric substrate is analysed theoretically and calculated for different values of the cover-film interface nonlinearity. The difference between the phase constants for forward and backward propagation direction against the film thickness has also been computed at different values of the signal operating frequency. It has been found that the differential phase constant or the non-reciprocity can be minimized for the smaller operating frequencies and relatively thick films.