Brillouin light scattering from quantized spin waves in micron-size magnetic wires

An experimental study of spin-wave quantization in arrays of micron-size ma gnetic Ni80Fe20 wires by means of Brillouin light-scattering spectroscopy i s reported. Dipolar-dominated Damon-Eshbach spin-wave modes laterally quant ized in a single wire with quantized wave vector values determined by the w idth of the wire are studied. The frequency splitting between quantized mod es, which decreases with increasing mode number, depends on the wire sizes and is up to 1.5 GHz. The transferred wave vector interval, where each mode is observed, is calculated using a light-scattering theory for confined ge ometries. The frequencies of the modes are calculated, taking into account finite-size effects. The results of the calculations are in a good agreemen t with the experimental data. [S0163-1829(99)00246-5].