Growth and properties of epitaxial iron oxide layers |
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| Authors: | Voogt F. C. Fujii T. Hibma T. Hoefman M. Smulders P. J. M. Wijnja G. H. Zhang G. L. Niesen L. |
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| Affiliation: | (1) Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands;(2) Present address: Department of Applied Chemistry, Faculty of Engineering, Okayama University, Tsushima-naka 3-1-1, 700 Okayama, Japan;(3) Present address: Shanghai Institute of Nuclear Research, Academia Sinica, Shanghai, PR China |
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| Abstract: | Epitaxial layers of iron oxides have been grown on a MgO(001) substrate by evaporating natural Fe or57Fe from Knudsen cells in the presence of a NO2 flow directed to the substrate. The resulting layers have been investigated in situ with LEED, RHEED, AES and XPS and ex situ with CEMS and ion beam analysis. For substrate temperatures between 200 and 400°C we observe RHEED oscillations during deposition, indicative of layer-by-layer growth. By adjusting the flux of NO2 at the surface, all stable and metastable cubic phases in the Fe-O system could be grown: FeO (wustite), Fe3O4 (magnetite),  -Fe2O3 (maghemite) and solid solutions between the latter two phases. Rutherford backscattering spectra show a relatively high minimum yield in the channel directions. |
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