Abstract
The periodic effects on the electronic properties of Ni/Co magnetic multilayers grown in the (111) direction are investigated by studying superlattices and finite bilayers formed with the same unit block. Band structures and Fermi surfaces are calculated using a Green-function-matching method within a self-consistent empirical tight-binding model. Our results show strong sp-d hybridization of the electronic levels, the existence of nested multisheet Fermi surfaces, and the occurrence of d-derived spatially extended states in both superlattices and finite bilayers. Nevertheless, the superlattice periodicity increases the band degeneracy in the in-plane direction and changes the energy position of the superlattice electron levels with respect to those of the bilayer. The discrepancies result in different Fermi wave vectors for both systems, which may yield different transport and dynamical coupling characteristics for superlattices and bilayers.
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