Reversible metamorphosis from Fe3O4 to FeO of epitaxial iron oxide films grown on the Fe-p(1 × 1)O surface

Abstract

The reduction and oxidation of epitaxial Fe₃O₄ films grown by reactive deposition on a Fe-p(1 × 1)O surface have been investigated by means of Auger electron spectroscopy (AES), low energy electron diffraction (LEED) and scanning tunneling microcopy (STM). The as-grown iron oxide samples display a square LEED pattern with a lattice constant compatible with a p(1 × 1) bulk terminated Fe₃O₄(001) surface. STM topographic images of Fe₃O₄ are characterized by atomically flat terraces separated by highly oriented steps running along the (010) and (100) crystallographic directions of the substrate. Upon annealing at 800 K in an ultra-high vacuum, AES reveals that magnetite transforms lớn FeO. The sample exposes the (001) surface of the rock salt structure, with a lattice parameter close lớn that of bulk wüstite. The Fe₃O₄ phase can be recovered by oxidation at 10⁻⁶ mbar of molecular oxygen.

Graphical abstract: Reversible metamorphosis from Fe3O4 lớn FeO of epitaxial iron oxide films grown on the Fe-p(1 × 1)O surface

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Article information

DOI: https://doi.org/10.1039/D0RA10650J
Article type: Paper
Submitted: 18 Dec 2020
Accepted: 12 Mar 2021
First published: 19 Mar 2021
This article is Open Access

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RSC Adv., 2021,11, 11513-11518

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Reversible metamorphosis from Fe₃O₄ lớn FeO of epitaxial iron oxide films grown on the Fe-p(1 × 1)O surface

M. Capra, A. Lodesani, A. Brambilla, M. Finazzi, L. Duò, F. Ciccacci and A. Picone, RSC Adv., 2021, 11, 11513 DOI: 10.1039/D0RA10650J

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