Ferromagnetic resonance studies of (Ag/Fe)n multilayers (abstract)

We report a detailed ferromagnetic resonance (FMR) study, at X band, of magnetic films constituted of (Ag‖Fe multilayer‖Ag) sandwiches deposited by sputtering on heated mica substrates, where the base and the top Ag layers are 550 A thick. For this (Ag/Fe) system the corresponding series of single Fe layers is reported in Ref. 1 (structural characteristics, FMR study). The resonance spectrum is studied as a function of the orientation [angle θH = (N,H) with respect to the film normal N] of the applied dc field H in a plane perpendicular to the film. We will present results relative to a series of Fe multilayers (Ag‖Fe)n=9, with spacer tAg=70 A, corresponding to a set of individual Fe layer thicknesses (tFe=24, 36, and 48 A). In summary, at room temperature, all the features (line shape, signal phase, position, linewidth) which characterize the resonance spectrum of a Fe multilayer are found different from the ones relative to the single resonance line observed for the corresponding single Fe layer (sam...