  We have observed localized spin-wave modes in individual thin-film
ferromagnetic wires using time-resolved Kerr microscopy as a micron-scale
spectroscopic probe. The localization is due to the partial demagnetization of
a wire when an external field is applied in the plane of the film and
perpendicular to the long axis of the wire. Spatially-resolved spectra
demonstrate the existence of distinct modes at the edges of a rectangular wire.
Spectral images clearly show the crossover of the two edge modes into a single
mode in low applied fields, in agreement with the results of micromagnetic
simulations.
