NONLINEAR DIFFRACTION OF MAGNETOSTATIC WAVES IN FERRITE FILMS

Two-dimensional nonlinear diffraction of magnetostatic waves (MSW) in ferrite films is studied numerically using the model of nonlinear para bolic equation. This equation is derived by a new method from a biline ar relation similar to the Lorentz lemma. it is shown, that in the fra mework of this model the evolution of two-dimensional backward volume MSW pulse leads to a collapse in the case of an infinite dim, while in a film waveguide of a finite width the collapse can be avoided, and t he pulse amplitude can be stabilized. Dynamics of modulation instabili ty of both backward volume and forward volume MSW under continuous exc itation is also investigated.