THEORETICAL AND EXPERIMENTAL APPROACH TO SPIN DYNAMICS IN THIN MAGNETIC-FILMS

The Landau-Lifshitz (L-L) equation describing the time dependence of t he magnetisation vector is numerically integrated fully without any si mplifying assumptions in the time domain and the magnetisation time se ries obtained is Fourier transformed (FFT) to yield the permeability s pectrum up to 10 GHz. The non linear results are compared to the exper imental results obtained on magnetic amorphous thin films of Co-Zr. Co -Zr-Re. We analyse our results with the frequency response obtained di rectly from the Landau-Lifshitz equation as well as with the second or der Gilbert frequency response.