Magnetostatic wave propagation in lossy ferrite layers under perpendicular bias

The complex wave number of magnetostatic waves propagating in multiple lossy ferrite layers is found by solving the dispersion equation using Davidenko’s method. The real and imaginary parts of the wave number are used to obtain quantities representing the power of modes as function of distance traveled and time spent in the material. The loss does not change significantly the real part of the wave number. When all ferrite layers have the same magnetization, then the loss experienced by a mode after it has spent a given period of time in the film is unique, independent of the order of the mode or the film thickness or the ground plane distances. When the magnetization differs from layer to layer then the loss experienced by a mode after it has spent a given period of time in the film depends on the order of the mode and the loss of each ferrite layers. The loss experienced by a mode after it has traveled a given distance in the ferrite depends on the order of the mode, the film thickness and the ground plane distances.