Magnetostatic surface wave propagation in a yttrium iron garnet double layer

Energy switching is investigated, both theoretically and experimentally, between two identical ferromagnetic films. The frequency region, and the applied magnetic field direction selected, permits a magnetostatic surface wave to be generated in each film. After the exact theory for this magnetostatic directional coupler is given, an experimental study of the evolution of the magnetic field distribution is presented. Good agreement between theory and experiment is obtained.