Ferromagnetic resonance studies of Ni nanowire arrays - art. no. 144421

Using ferromagnetic resonance, the angular dependence of the uniform preces sion mode of infinite cylinders is investigated at room temperature for low density Ni nanowire arrays, embedded in a polycarbonate membrane, with wir e diameters ranging from 35 mn to 500 nm. All wires reveal a very similar b ehavior of the resonance field vs angle, independent of the wire diameter a nd wire density, corresponding to the uniform precession mode of an infinit e cylinder including the shape demagnetization anisotropy and a small uniax ial anisotropy contribution. From the analysis of the angular dependence of the linewidth, the distribution of the wire orientation and the effective anisotropy field can be estimated. The latter is broadened due to the prese nce of a sub-structure in the absorption spectra.