Self-generation of microwave magnetic envelope soliton trains in yttrium iron garnet thin films

The self-generation of microwave magnetic envelope solitons in magnetic films has been realized for the first time. Solitons with a width of 20 ns and a carrier frequency of 5.1555 GHz were generated for the magnetostatic backward volume wave (MSBVW) configuration in a 5.2 mu m thick yttrium iron garnet film. The film and MSBVW propagation structure were part of a ring with an overall gain of +4 dB. Pulse modulation at 10 MHz provided the interrupted feedback and the active mode locking which was needed to produce a stable and continuous stream of self-generated soliton pulses. Pulse width and phase measurements confirmed the soliton nature of the self-generated pulses.