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Ferromagnetic resonance (FMR) measurements have been performed over a broad frequency range on epitaxial films of Co and bcc α-Fe grown onto epilayers of ZnSe by molecular-beam-epitaxy techniques on (001) and (110) GaAs substrates. In-plane and perpendicular FMR results were used in deducing the magnetic parameters and spin-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. Well-resolved SWR modes were observed in the Fe/ZnSe films, allowing extraction of the exchange stiffness constant. Few spin-wave excitations were observed for the Co/ZnSe films. Both (110) Fe/ZnSe and (110) Co/ZnSe show evidence for surface spin-wave excitations. These excitations are attributed to variations in the internal field near the interface.
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Oliver et al. (1989) studied this question.
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