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Spin-resolved photoemission from polycrystalline Cr02 films shows a spin polarization (P) of nearly +100% for binding energies near 2 eV belo~the Fermi level (El. -). Despite the metallic resistivity behavior, extremely low intensity is observed in the photoemission spectra near EF. Our findings are in contrast to recent band-structure calculations, predicting Cr02 to be a half-metallic ferromagnet with I' =+100% at Ep. PACS numbers: 75.50.Cc, 71.25.Pi, 79.60.Cn The ferromagnet Cr02 is one of the technologically most important transition-metal oxides. But surprisingly enough, its electronic structure is up to now an open question.A first qualitative model was proposed by

Spin-polarized photoemission spectra at low photon energies from ferromagnetic ultrathin Fe layers on Cu(l00) show a substantial polarization of the Cu 3d peaks. This is attributed to spin-dependent attenuation in the Fe overlayer. Values of the spin-dependent mean free path at low electron energies are obtained.

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The adsorbate systems O(2/1)/Ni(110), S c(2)&2)/Ni(110), and 0 p(2)&2)/Fe(110) were investigated by means of spin-, angle-, and energy-resolved photoemission spectroscopy. For the Ni 3d bands with S4 symmetry near the X point of the Brillouin zone we find no change of the exchange splitting due to adsorption of 0 and S. A majority-spin band with S3 symmetry at the same k point shows a slight shift to lower binding energies under adsorption of O. -For 0 p(2)&2)/Fe(110) no changes in binding energy were observed for the Fe d bands with X& and X& symmetry.Depolarization effects of the photoelectrons caused by the adsorbates are interpreted in terms of exchange scattering processes. The same scattering process gives rise to very pronounced structures in the spin-resolved spectra of S c(2&(2)/Ni(110). Different scattering probabilities for majority and minority electrons indicate that 0 and S on Ni(110) are polarized parallel to the Ni bulk spin polarization.