  We investigated the magnetization dynamics of a patterned
Co$_{25}$Fe$_{75}$-based heterostructure with a novel optical measurement
technique that we call microfocused frequency-resolved magneto optic Kerr
effect ($\mu$FR-MOKE). We measured the magnetic field dependence of the
dynamical spin-wave susceptibility and recorded a spatial map of the spin-waves
excited by a microwave antenna. We compare these results to those obtained on
the same sample with the established microfocused Brillouin light scattering
technique. With both techniques, we find a spin-wave propagation length of
5.6$\mu$m at 10GHz. Furthermore, we measured the dispersion of the wavevector
and the spin-wave propagation length as a function of the external magnetic
field. These results are in good agreement with existing literature and with
the employed Kalinkos-Slavin model.
