The resonant eigenmodes of a nitrogen-implanted iron {\alpha}'-FeNcharacterized by weak stripe domains are investigated by Brillouin lightscattering and broadband ferromagnetic resonance experiments, assisted bymicromagnetic simulations. The spectrum of the dynamic eigenmodes in thepresence of the weak stripes is very rich and two different families of modescan be selectively detected using different techniques or differentexperimental configurations. Attention is paid to the evolution of the modefrequencies and spatial profiles under the application of an external magneticfield, of variable intensity, in the direction parallel or transverse to thestripes. The different evolution of the modes with the external magnetic fieldis accompanied by a distinctive spatial localization in specific regions, suchas the closure domains at the surface of the stripes and the bulk domainslocalized in the inner part of the stripes. The complementarity of BLS and FMRtechniques, based on different selection rules, is found to be a fruitful toolfor the study of the wealth of localized mag-netic excitations generally foundin nanostructures.
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