Elsevier

Surface Science

Volumes 331–333, Part A, 1 July 1995, Pages 703-709
Surface Science

Oxidation of the Fe/Cu(100) interface

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Abstract

The interaction between oxygen and the Fe/Cu(100) interface has been studied as a function of both the iron thickness and the oxygen exposure by means of UPS and XPS spectroscopies. A careful analysis of the Fe 2p spectra has shown that upon exposing Fe thin films (0.5–10 ML) to 104 L of oxygen there is always the formation of Fe2O3. Instead, when a copper surface containing 0.5 and 1 ML of iron has been exposed to increasing amounts of oxygen (1–104 L), the presence of both Fe2+ and Fe3+ is evident in the middle stage of the oxidation. The UPS spectra have shown a strong decrease of the Cu 3d features when the Fe/Cu interface has been exposed to oxygen, even for very thin Fe films (0.5–1 ML). This behaviour can be interpreted in terms of a sizeable decrease of the mean free path of low energy valence band electrons when the iron film is oxidized with respect to that observed in metallic iron films.

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