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Magnetic droplets are strongly nonlinear and localized spin-wave solitonsthat can be formed in current-driven nanocontacts. Here, we propose a simpleway to launch droplets in an inhomogeneous nanoscopic waveguide. We use thedrift motion of a droplet and show that in a system with broken translationalsymmetry, the droplet acquires a linear momentum and propagates. We find thatthe droplet velocity can be tuned via the strength of the break in symmetry andthe size of the nanocontact. In addition, we demonstrate that the launcheddroplet can propagate up to several micrometers in a realistic system withreasonable damping. Finally, we demonstrate how an annihilating dropletdelivers its momentum to a highly nonreciprocal spin-wave burst with a tunablewave vector with nanometer wavelengths. Such a propagating droplet can be usedas a moveable spin-wave source in nanoscale magnonic networks. The presentedmethod enables full control of the spin-wave emission direction, which canlargely extend the freedom to design integrated magnonic circuits with a singlespin-wave source.

Propagating magnetic droplet solitons as moveable nanoscale spin-wave sources with tunable direction of emission