Spin-wave envelope solitons in periodically modulated magnetic films

A theory is developed to show that spin-wave envelope solitons can be formed in perpendicularly magnetized magnetic films near the energy gaps in the spectrum, which are created by weak periodic modulation of the bias magnetic field. When the whole frequency band of the input spin-wave pulse lies in the region of strong dispersion near (but outside) the periodic gap, the formation and propagation of spin-wave envelope solitons are shown to be governed by the nonlinear Schrodinger equation. The envelope soliton duration for the case of yttrium-iron-garnet films is estimated