  Magnetic skyrmions are nanoscale spin structures recently discovered at room
temperature (RT) in multilayer films. Employing their novel topological
properties towards exciting technological prospects requires a mechanistic
understanding of the excitation and relaxation mechanisms governing their
stability and dynamics. Here we report on the magnetization dynamics of RT
N\'eel skyrmions in Ir/Fe/Co/Pt multilayer films. We observe a ubiquitous
excitation mode in the microwave absorption spectrum, arising from the
gyrotropic resonance of topological skyrmions, and robust over a wide range of
temperatures and sample compositions. A combination of simulations and
analytical calculations establish that the spectrum is shaped by the interplay
of interlayer and interfacial magnetic interactions unique to multilayers,
yielding skyrmion resonances strongly renormalized to lower frequencies. Our
work provides fundamental spectroscopic insights on the spatiotemporal dynamics
of topological spin structures, and crucial directions towards their
functionalization in nanoscale devices.
