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Surfactant properties of oxygen in the homoepitaxial growth of Fe: a MDS study

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Surface Science

Volumes 482-485, Part 2
20 June 2001
Pages 850-853

PII: S0039-6028(00)01086-4
Copyright © 2001 Elsevier Science B.V. All rights reserved.

R. Moroni, F. Bisio, A. Gussoni, M. Canepa and L. Mattera ^,

Dipartimento di Fisica, Unità INFM and CFSBT, Università di Genova, via Dodecaneso 33, I-16146 Genova, Italy

Available online 6 July 2001.

The growth of ultra thin iron films (up to a thickness of 5_¯6 ML) on O(1×1)_¯Fe/Ag(0 0 1) has been investigated by means of He reflectivity (R_He) and metastable de-excitation spectroscopy. The presence of oxygen induces a quasi-ideal layer-by-layer growth at variance with the case of the homoepitaxial growth of iron on Fe(0 0 1). The surface electronic density of states suddenly changes upon the deposition of the first half of a monolayer. After the sudden change in the first stages of the growth, the surface density of states of both O_2p and Fe_3d states remains essentially unchanged, irrespectively of the thickness of the deposited film. This provides a clear indication that oxygen floats at the surface acting as a surfactant for the growth of iron on O(1×1)_¯Fe/Ag(0 0 1). The stationary fraction of oxygen that remains on the topmost layer as growth proceeds depends on the substrate temperature. Post-growth annealing up to 650 K restores the initial coverage of oxygen and the ordered O(1×1) phase.

Author Keywords: Chemisorption; Growth; Iron; Oxygen

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(8K)
Fig. 1. Energy distribution curves for O(1×1)_¯Fe/Ag(0 0 1) (panel a) and after the deposition of 0.5 ML of Fe on the substrate held at room temperature (panel b) and at 150°C (panel c). The experimental data are represented by dots while the continuous lines provide the fit to the data (see text).

(9K)
Fig. 2. Density of states obtained by fitting the experimental data relative to the O(1×1)_¯Fe/Ag(0 0 1) (panel a) and after Fe deposition at room temperature (panel b) and 150°C (panel c).

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Corresponding author. Tel.: +39-103-536-287; fax: +39-10-311-066; email: mattera@fisica.unige.it

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Surface Science
Volumes 482-485, Part 2
20 June 2001
Pages 850-853

14 of 124

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