Abstract
Formation of dipolar spin wave envelope solitons from input pulses parametrically amplified by microwave pumping has been investigated experimentally in an axially magnetized yttrium–iron–garnet (YIG) film waveguide by means of the space- and time-resolved Brillouin light scattering technique. The interaction of a linear input spin wave packet with double-frequency microwave pumping leads to the formation of two parametrically amplified contrapropagating wave packets: forward and phase-conjugated reversed. It was found that both forward and reversed packets immediately after the interaction with pumping increase their lengths almost two times compared to the length of the input packet. In the course of further propagation both wave packets demonstrate a significant compression in length (up to 2.5 times) which depends on the power of the input signal and is a clear signature of envelope soliton formation.
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