ELECTRONIC-STRUCTURE OF ULTRATHIN COBALT FILMS ON W(110)

Ultrathin films of cobalt on W(110) are investigated by angle-resolved photoelectron spectroscopy excited with unpolarized and linearly polarized He I radiation. The epitaxial growth of the films is studied by reflection high-energy electron diffraction, x-ray-excited photoelectron diffraction, and Auger electron spectroscopy. The influence of symmetry, packing density, and film thickness on the electronic structure is discussed. The band structure of the quasi-two-dimensional systems is mapped out and compared with full-potential linearized augmented-plane-wave calculations for the pseudomorphic monolayer of Co on W(110) and for the unsupported close-packed monolayer.