Abstract
Epitaxial MgO(100) films, deposited on the Fe(100) surface by direct evaporation of stoichiometric magnesium oxide under ultrahigh-vacuum conditions, are examined by spin-polarized valence-band photoemission and magnetic linear dichroism in core-level spectroscopy. The excellent quality of the MgO films prepared in this way is clearly revealed by relatively small photocurrent intensity observed above the MgO valence-band maximum and by spectral features in the photoemission data. No evidence of the formation of an interfacial FeO layer is found in this MgO/Fe(100) system. Only a structural reordering is promoted by annealing the interface up to 400{sup o}C , as evident by the minute changes in the photoemission spectra. Further annealing to 500{sup o}C , however, leads to more substantial changes in the spectra, possibly related to further ordering of the interface and/or partial uncovering of the Fe(100) metal due to MgO desorption and/or clustering. The influence of screening effects from the Fe(100) substrate to the photohole created by the photoemission process in the MgO overlayer is also examined.
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