Abstract
The influence of dissipation on the process of formation and propagation of envelope solitons is considered on the example of spin wave envelope solitons in yttrium iron garnet (YIG) film waveguides. It is shown that the measurements of attenuation of the peak power of a propagating nonlinear wave packet in a weakly dissipative medium can be used to determine the soliton formation length. This length turns out to be smaller than the characteristic dispersion length calculated for a given shape and duration of the input pulse. A simple approximate analytic expression for the soliton formation time in a dissipative medium is introduced and confirmed by both numerical calculations and preliminary laboratory experiments on dipolar spin waves in YIG waveguides.
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