Spin-wave frequency discretization in submicron rectangular prisms

Spin-wave frequency discretization has been observed by Brillouin light scattering in an array of tangentially magnetized 800 nmx550 nm Ni81Fe19 rectangular prisms with thicknesses of 30 nm and dot separations of 200 nm. For a large wave vector interval, several discrete dispersionless modes were observed. The experimental frequencies were compared to those calculated using a recently developed analytical model for flat uniformly magnetized rectangular prisms. The agreement between the experimental and calculated frequencies is very good. In addition to the above mentioned modes, a low frequency mode was experimentally detected over a wide range of transferred wave vectors. Finally, the decrease in frequency of the first perpendicular standing spin-wave mode, observed in the patterned sample with respect to in the continuous film, was successfully reproduced. (C) 2003 American Institute of Physics.