Ferromagnetic resonance measurements on epitaxial grown Fe/ZnSe and Co/ZnSe films on GaAs substrates

摘要

Ferromagnetic resonance (FMR) measurements have been performed over a broad frequency range on epitaxial films of Co and bcc agr;hyphen;Fe grown onto epilayers of ZnSe by molecularhyphen;beamhyphen;epitaxy techniques on (001) and (110) GaAs substrates. Inhyphen;plane and perpendicular FMR results were used in deducing the magnetic parameters and spinhyphen;wave resonance (SWR) dispersion of the films. The magnetic parameters deduced for Fe films agree with previous results obtained on the (001) Fe/ZnSe film. Wellhyphen;resolved SWR modes were observed in the Fe/ZnSe films, allowing extraction of the exchange stiffness constant. Few spinhyphen;wave excitations were observed for the Co/ZnSe films. Both (110) Fe/ZnSe and (110) Co/ZnSe show evidence for surface spinhyphen;wave excitations. These excitations are attributed to variations in the internal field near the interface.