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In the emerging field of magnonics, spin waves are foreseen as signalcarriers for future spintronic information processing and communicationdevices, owing to both the very low power losses and a high deviceminiaturisation potential predicted for short-wavelength spin waves. Yet, theefficient excitation and controlled propagation of nanoscale spin waves remainsa severe challenge. Here, we report the observation of high-amplitude,ultrashort dipole-exchange spin waves (down to 80 nm wavelength at 10 GHzfrequency) in a ferromagnetic single layer system, coherently excited by thedriven dynamics of a spin vortex core. We used time-resolved x-ray microscopyto directly image such propagating spin waves and their excitation over a widerange of frequencies. By further analysis, we found that these waves exhibit aheterosymmetric mode profile, involving regions with anti-Larmor precessionsense and purely linear magnetic oscillation. In particular, this mode profileconsists of dynamic vortices with laterally alternating helicity, leading to apartial magnetic flux closure over the film thickness, which is explained by astrong and unexpected mode hybridisation. This spin-wave phenomenon observed isa general effect inherent to the dynamics of sufficiently thick ferromagneticsingle layer films, independent of the specific excitation method employed.

Coherent excitation of heterosymmetric spin waves with ultrashort wavelengths