DETERMINATION OF THE ELECTRONIC DENSITY-OF-STATES NEAR BURIED INTERFACES - APPLICATION TO CO CU MULTILAYERS/

High-resolution L(3) x-ray absorption and emission spectra of Co and C u in Co/Cu multilayers are shown to provide unique information on the occupied and unoccupied density of d states near buried interfaces. Th e d bands of both Co and Cu interfacial layers are shown to be conside rably narrowed relative to the bulk metals, and for Cu interface layer s the d density of states is found to be enhanced near the Fermi level . The experimental results are confirmed by self-consistent electronic structure calculations.