MAGNETIC ANISOTROPIES OF FE-N V-M(001) SUPERLATTICES DETERMINED BY FERROMAGNETIC-RESONANCE/

The temperature-dependent magnetic anisotropies of Fe-n/V-m(001) super lattices on MgO(001) were determined by Ferromagnetic Resonance (FMR). The re-layer thickness n ranges between 2 and 4 atomic layers. The sh ape anisotropy dominates, and the easy-axis of the magnetization of th e samples is always in the film plane. The second-order out-of-plane m agnetic anisotropy is mainly determined by magnetoelastic effects due to the in-plane lattice expansion of the re. The fourth order in-plane anisotropy presents a strong temperature dependence as a result of th e competition between a volume part favoring the Fe-[100] and a surfac e part favoring the Fe-[110] in-plane direction. A very small step-ind uced in-plane uniaxial anisotropy reveals the existence of very-large atomically-flat terraces. This information, in combination with the ob servation of very narrow FMR-linewidths, indicates the excellent struc tural quality of our samples.