Nonstationary spin waves in a single rectangular permalloy microstrip under uniform magnetic excitation

Ferromagnetic resonance modes in a single rectangular ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ microstrip were directly imaged using time-resolved scanning transmission x-ray microscopy combined with phase-locked ferromagnetic excitation scheme, and the findings corroborated by micromagnetic simulations. Although under uniform confined microstructure typically standing spin waves are expected, all showed nonstationary character both at off resonance, latter being additionally detected microantenna-based resonance. The effect of edge quality on was observed