We performed time domain propagating spin-wave (SW) spectroscopy to investigate SW soliton formation. By choosing backward volume SW mode, we successfully observed a multiple solitons formation and propagation. The SW power dependence on the duration of excitation signal showed nonlinear dependence, and SW maintained its wave packet width. By making a contour plot of SW power, the evolution of SW soliton was clearly demonstrated. The generation and annihilation of SW soliton exhibited a complicated behavior, showing the competition between nonlinear effect and dispersion/relaxation effects.

In this study, switching of the spin-wave propagation was investigated using an yttrium iron garnet (YIG) waveguide. A dynamic magnonic crystal was designed to control the non-reciprocal surface spin waves. The dynamic magnonic crystal controlled the periodic modulation field on the YIG film and caused a strong Bragg reflection on the surface spin waves. The maximum effect of Bragg reflection was analyzed by the wavelet to be 95% of its intensity. The spin-wave switching by the dynamic magnonic crystal will be a promising method of carrier-flow control for constructing the integrated magnonic circuits.