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The spectral signatures of magnetic skyrmions under microwave fieldexcitation are of fundamental interest and can be an asset for high frequencyapplications. These topological solitons can be tailored in multilayered thinfilms, but the experimental observation of their spin wave dynamics remainselusive, in particular due to large damping. Here, we study Pt/FeCoB/AlO$_x$multilayers hosting dense and robust skyrmion lattices at room temperature withGilbert damping of $\sim 0.02$. We use magnetic force microscopy tocharacterise their static magnetic phases and broadband ferromagnetic resonanceto probe their high frequency response. Micromagnetic simulations reproduce theexperiments with accuracy and allow us to identify distinct resonant modesdetected in the skyrmion lattice phase. Low ($<$ 2 GHz) and intermediatefrequency ($2-8$ GHz) modes involve excitations localised to skyrmion edges inconjunction with precession of the uniform background magnetisation, while ahigh frequency ($>$ 12 GHz) mode corresponds to in-phase skyrmion coreprecession emitting spin waves into uniform background with wavelengths in the50--80 nm range commensurate with the lattice structure. These findings couldbe instrumental in the investigation of room temperature wave scattering andthe implementation of novel microwave processing schemes in reconfigurablearrays of solitons.

Resonant dynamics of skyrmion lattices in thin film multilayers: Localised modes and spin wave emission