Analysis of the distribution of magnetostatic surface waves by scanning the surface of a ferrite slab

A technique for the experimental visualization of the distribution of the amplitudes and phases of the magnetostatic waves propagating in ferrite-film structures is developed. It is shown that applying the Fourier transform to the data obtained with the use of this technique, it is possible to investigate the mode composition of the magnetostatic waves and find dispersion dependences for each mode. On the basis of the proposed technique, distributions of magnetostatic surface waves in bilateral samples of ferrite films are investigated. It is found that, at a wavelength comparable with the substrate thickness, the ferrite film at the opposite side of the substrate significantly changes the wave distribution in the sample and causes spatial beating along the propagation axis.