The self-generation of single, fundamental, stable, spin-wave-envelope black and gray dark solitons has been realized for the first time. These solitons were generated from microwave magnetostatic surface waves (MSSWs) propagated in an in-plane magnetized yttrium iron garnet film MSSW delay line in a resonant ring. These fundamental dark solitons were made possible by a new and general filtering technique for a high gain nonlinear resonant ring. The amplitude and phase profiles together with the power spectra of the self-generated microwave pulses confirm their fundamental dark soliton nature.

Dark and bright envelope solitons have been generated from a single magnetostatic carrier wave with attractive nonlinearity. The solitons were formed through the mode beating of two microwave input signals with frequency separations of 3-30 MHz for an in-plane magnetized single crystal yttrium-iron-garnet film in the magnetostatic backward volume wave configuration. Numerical modeling based on the Ginzburg-Landau equation model gave good agreement with the data.

Nondispersive magnetostatic forward volume wave propagation in a double-layered yttrium-iron-garnet film structure with dielectric spacer J. Appl. Phys. 85, 4862 (1999); 10.1063/1.370046Propagation properties of microwave magnetic envelope solitons in thin yttrium-iron-garnet films at 5 GHz (abstract) Effect of higher order magnetostatic forward volume wave modes on Bragg diffraction of laser light in a layered yttrium iron garnet film geometryThe nonlinear decay of continuous-wave magnetostatic surface wave and backward volume wave signals has been measured for propagation in a narrow 6.9 m thick yttrium-iron-garnet film strip, with excitation frequencies and wave numbers between 5470 and 5630 MHz and 47 and 216 rad/cm, respectively. The results show: ͑1͒ that the onset of nonlinear damping is a threshold effect, and ͑2͒ that a nonlinear decay model with two damping terms, one linear and one quadratic in the wave power, are needed to model the measured response.

Resonant ring feedback with frequency filtering has been used for the self-generation of bright soliton trains. The solitons were produced from magnetostatic backward volume spin waves propagated in an in-plane magnetized magnetic film delay line as part of the resonant ring structure. The amplitude and phase time profiles, together with the power spectra of the self-generated pulses, confirm their bright soliton nature.

No abstract