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Physical Review B (Condensed Matter and Materials Physics) -- March 15, 2000 -- Volume 61, Issue 12, pp. 8475-8483

Growth of Fe on MgO(001) studied by He-atom scattering

G. Fahsold and A. Pucci

Universität Heidelberg, Kirchhoff-Institut für Physik, Albert-Ueberle-Strasse 3-5, 69120 Heidelberg, Germany

K.-H. Rieder

Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany

(Received 19 February 1999)

With He-atom scattering we studied the epitaxial growth of Fe ultrathin films deposited on in situ cleaved MgO(001). The measurements at various substrate temperatures (140T670 K) start with bare MgO(001) and extend to film thicknesses beyond the complete coverage of the substrate. From the development of specular intensity with Fe deposition we estimate saturation island densities, give a quantitative description of the evolution of their size and shape, and calculate a thickness for coalescence of all islands. The observed three-dimensional metal island growth behavior is suppressed at low temperature (140 K) where a monolayer film almost completely covers the substrate. For increased substrate temperatures a decreased island density and an increased interlayer mass transport from substrate level onto the islands leads to a temperature and thickness dependent change in island shape. ©2000 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v61/p8475
DOI: 10.1103/PhysRevB.61.8475
PACS: 68.55.Jk, 61.18.Bn        Additional Information

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