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 photoemission in very thin copper films (up to six monolayers) deposited at 140 K on fcc-Co(100). They display energy-dependent cross-section and dispersion with k⊥, indicating their resonant character. The corresponding Cu/Co resonant band has been plotted within the bulk Brillouin zone of fcc-Co. This band approaches minority and majority Δ1 cobalt bands at different parts along the ΓX axis. Such a behavior suggests a changing spin character across the Brillouin zone, which should be observable in spin-resolved photoemission as a function of photon energy

Surface Magnetism Studied by Polarized Light Emission after He^{+} Scattering

Surface magnetism is studied by means of an ion beam of low energy (2-15 keV) scattered off the surface under grazing incidence conditions. During the scattering, a small fraction of the ions is neutralized into excited states which decay subsequently by light emission. The circular polarization of the light emitted after the scattering event is related to the surface magnetization of the sample. We used a Fe(1 1 0) single crystal and a He+ ion beam to study the circular polarization as a function of a number of parameters, such as primary energy, angle of incidence and azimuthal angle of the sample. The results are discussed in terms of the spin-filter model