A NUMERICAL STUDY OF NONLINEAR SCHRODINGER-EQUATION SOLUTIONS FOR MICROWAVE SOLITONS IN MAGNETIC THIN-FILMS

Dipole-exchange spin wave pulses in magnetic thin films have been nume rically modeled with the nonlinear Schrodinger equation. Small input p ulse amplitudes yield propagating wave packets which exhibit a linear response. As the amplitude of the input pulse is increased, the propag ating spin-wave pulse exhibits soliton and then multisoliton structure s. In the soliton regime, three principal characteristics are observed . First, in the zero damping limit, the soliton propagates without cha nging its shape. Second, the soliton exhibits an inherent velocity in addition to its linear group velocity. Third, the soliton exhibits a d amping rate that is approximately twice that in the linear regime.