Resonant quantum well states in thin copper films on fcc-Co(100)

The photon-energy dependence of quantum well states around the belly of the Fermi surface has been investigated by means of angle-resolved photoemissi on in very thin copper films (up to six monolayers) deposited at 140 K on f cc-Co(100). They display energy-dependent cross-section and dispersion with k(perpendicular to), indicating their resonant character. The correspondin g Cu/Co resonant band has been plotted within the bulk Brillouin zone of fe e-Co. This band approaches minority and majority Delta(1) cobalt bands at d ifferent parts along the Gamma X axis. Such a behavior suggests a changing spin character across the Brillouin zone, which should be observable in spi n-resolved photoemission as a function of photon energy. (C) 1999 Elsevier Science B.V. All rights reserved.