Isofrequency Dependences of Spin Waves in a Tangentially Magnetized Ferrite Plate Adjoining a Perfect Magnetic Wall

Maxwell’s equations without using the magnetostatic approximation were used to derive a dispersion equation for spin waves in a tangentially magnetized ferrite plate one of the surfaces of which adjoins a perfect magnetic wall, and the isofrequency dependences of these waves were calculated. It was found that the wave distribution along the plate thickness is described by two wavenumbers, and the isofrequency dependences of different modes of spin waves smoothly pass one into another and have sections corresponding to the volume–volume, volume–surface, and surface–surface wave distributions.