Spin polarization and structure of molecular oxygen adsorbed on Fe(1 1 0) |
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Authors: | M Busch M Gruyters H Winter |
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Institution: | Humboldt-Universität zu Berlin, Institut für Physik, Arbeitsgruppe PGD, Newtonstraße 15, D-12489 Berlin, Germany |
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Abstract: | We investigated the structural and magnetic properties of Fe(1 1 0) for molecular oxygen adsorption at room temperature. For the c(2 × 2) and c(3 × 1) superstructures, spin-polarized secondary electron emission (SPSEE) induced by protons and electrons reveals a nearly unchanged polarization compared to clean Fe(1 1 0). An appreciable decrease in polarization is found for the disordered layer of oxygen at a coverage Θ ≈ 1. This decrease is more pronounced for the spin polarization determined by electron capture (EC) to excited atomic He levels after grazing scattering. From a comparison of data obtained by proton-induced SPSEE and spin-polarized EC we conclude that the polarization at the vacuum boundary vanishes for an oxygen coverage Θ ≈ 1 while the polarization in the underlying Fe substrate layers is hardly changed. |
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Keywords: | Spin polarization SPSEE LEED AES Electron capture Iron Oxygen Initial stages of oxydation |
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