MBE-growth of iron and iron oxide thin films on MgO(100), using NO2, NO, and N2O as oxidizing agents

F. C. Voogt, T. Hibma, P. J M Smulders, L. Niesen, Tatsuo Fujii

Research output: Contribution to journalArticle

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Abstract

We have made a study of the use of NO2 as the source of oxygen in the MBE-growth of iron oxides thin films. It is found that NO2 is a much more efficient oxidizing agent than molecular O2. As indicated by Moessbauer spectroscopy, performed on 57Fe probe layers, NO2 is not only capable of forming stoichiometric magnetite Fe3O4, but also all non-stoichiometric Fe3-δO4 phases. Even the metastable maghemite phase γ-Fe2O3 (Fe3-δO4 with δ = 1/3) can be formed. All iron oxides grow layer-by-layer-like, as indicated by strong RHEED intensity oscillations. When small doses of NO2 are used, new wustite Fe1-xO and Fe3O4 phases are formed. In contrast to the Fe3-δO4 films, these phases have nitrogen incorporated into the crystal lattice. Similar compounds are obtained when NO is used as the source of oxygen. The use of N2O does not lead to the formation of iron oxides. It does, however, alter the growth mode of Fe on MgO(100). Whereas Fe deposited under UHV conditions forms 3D islands, the N2O acts as a surfactant and induces 2D layer-by-layer growth.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalUnknown Journal
Volume477
Publication statusPublished - 1997
Externally publishedYes

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Iron oxides
Oxidants
Molecular beam epitaxy
Oxide films
Iron
Thin films
Reflection high energy electron diffraction
Oxygen
Metastable phases
Magnetite
Ferrosoferric Oxide
Crystal lattices
Surface active agents
Surface-Active Agents
Spectroscopy
Nitrogen
ferric oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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MBE-growth of iron and iron oxide thin films on MgO(100), using NO2, NO, and N2O as oxidizing agents. / Voogt, F. C.; Hibma, T.; Smulders, P. J M; Niesen, L.; Fujii, Tatsuo.

In: Unknown Journal, Vol. 477, 1997, p. 211-216.

Research output: Contribution to journalArticle

Voogt, F. C. ; Hibma, T. ; Smulders, P. J M ; Niesen, L. ; Fujii, Tatsuo. / MBE-growth of iron and iron oxide thin films on MgO(100), using NO2, NO, and N2O as oxidizing agents. In: Unknown Journal. 1997 ; Vol. 477. pp. 211-216.
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