Quantized spin wave modes in micron size magnetic disks

We report on the observation of spin wave quantization in tangentially magn etized Ni80Fe20 disks by means of Brillouin light scattering spectroscopy. For a large wave vector interval, several discrete, dispersionless modes wi th a frequency splitting up to 2.5 GHz were observed. The modes are identif ied as being magnetostatic surface spin wave modes quantized by their later al confinement in the disk. For the lowest modes, dynamic magnetic dipolar coupling between the disks is found for a disk spacing of 0.1 mu m. (C) 200 0 American Institute of Physics. [S0021-8979(00)30608-9].