Ferromagnetic Resonance of Fe/Mg Multilayered Films with Artificial Superstructure

Abstract

Ferromagnetic resonance (FMR) of multilayered metallic films synthesized from an insoluble combination of Fe and Mg is studied in a temperature range from 10 K to 300 K. A well defined FMR signal is observed in each sample with Fe thickness ranging from 4 Å to 30 Å. The observed spectra are found to be strongly dependent on the regularity of the layered structure. The resonance field exhibits an unusual shift which changes systematically as a function of the thickness as well as temperature. The origin of the shift of the resonance field is discussed in relation to the amorphous-like structure observed for the thickness less than 12 Å.