Lateral Quantization of Spin Waves in Micron Size Magnetic Wires

We report on the observation of quantized surface spin waves in periodic arrays of magnetic ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ wires by means of Brillouin light scattering spectroscopy. At small transferred wave vectors $(q_{\Vert }\cong 0–1.0\times {10}^5{\mathrm{cm}}^{-1\mathrm{}})$ several discrete, dispersionless modes with a frequency splitting of up to 0.9 GHz were observed for the wave vector oriented perpendicular to the wires. From the frequencies of the modes and the wave-vector interval where each mode is observed, the modes are identified as dipole-dominated surface spin-wave modes of the film with quantized wave-vector values due to a lateral standing wave condition.