PARAMETRIC AMPLIFICATION OF SPIN-WAVE ENVELOPE SOLITONS IN FERROMAGNETIC-FILMS BY PARALLEL PUMPING

A theory for parametric amplification of spin wave envelope solitons i n ferromagnetic film by parallel pumping is suggested. A system of non linear equations describing evolution of nonlinear wave packets both i n time and spice domains is derived. Analysis shows that an effective amplification of spin wave solitons is possible in a transient regime when amplitudes of the parametrically excited waves are in growth. Num erical estimations of the experimental parameters necessary to achieve amplification of backward volume wave solitons in yttrium iron garnet films are given.