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The effects of oxygen exposure on ultrathin films of Ni and Cr deposited on Fe(001) are studied by means of low energy electron diffraction, Auger electron spectroscopy and scanning tunneling microscopy.In the case of the Ni/Fe(001) oxidation we find that, since the first stages of oxygen exposure, Fe atoms segregate toward the sample surface, where their oxidation takes place. Post-annealing treatments...
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