Relation between observed micromagnetic ripple and FMR width in ultrasoft magnetic films

Using Lorentz transmission electron microscopy, the micromagnetic structure was observed and the periodicity and angular spread of the in-plane magnetization were estimated for Fe-Zr-N films sputter-deposited on different substrates. The influence of the micromagnetic ripple on the ferromagnetic resonance width is analyzed using an approach based on the Landau-Lifshitz equation. A strong dependence of the resonance width on the magnetic moment dispersion is predicted. To a large extent, this particular aspect explains the high frequency response in some of our films.