Excitation of fundamental multiple dark solitons from forced biharmonic oscillations in a magnonic active ring

This paper reports an experimental demonstration of efficient excitation of fundamental dark spin wave solitons on a magnonic active ring below self-oscillation threshold by means of a biharmonic technique. This technique is shown to be especially appropriate for implementing multisoliton regimes otherwise unattainable. Theoretical analysis has revealed a very important role played by the phase relations between individual harmonics generated nonlinearly in the process of the formation of multiple solitons. The proposed ad hoc approach making use of the inverse Fourier transform has allowed us to elucidate the mechanisms underlying the formation of investigated nonlinear waveforms from their power spectra.