Island-size distributions in submonolayer epitaxial growth: Influence of the mobility of small clusters
Journal Article
·
· Physical Review, B: Condensed Matter
- Institute for Physical Research and Technology, Iowa State University, Ames, Iowa 50011 (United States)
- Abteilung Oberflaechenchemie und Katalyse, Universitaet Ulm, D-89069 Ulm (Germany)
- Department of Mathematics and Ames Laboratory, Iowa State University, Ames, Iowa 50011 (United States)
We examine the influence of dimer mobility on the size distribution of two-dimensional islands formed by irreversible nucleation and growth during deposition. We first characterize the transition in scaling of the mean island density with increasing dimer mobility, from the classic form described by Venables [Philos. Mag. {bold 27}, 697 (1973)] to the modified form for {open_quote}{open_quote}rapid{close_quote}{close_quote} mobility described by Villain {ital et} {ital al}. [J. Phys. (France) I {bold 2}, 2107 (1992)]. The corresponding transition in the asymptotic scaling function describing the shape of the island-size distribution is then also characterized. In addition, we contrast the mean-field form of the scaling function for rapid dimer mobility with that for zero mobility. Analysis of experimental data for Au/Au(100), Fe/Fe(100), Cu/Cu(100), and Pt/Pt(111) homoepitaxy reveals no clear evidence for a regime of modified island density scaling due to rapid dimer mobility. However, for Fe/Fe(100) below 400 K, we argue that mobility of small clusters significantly influences the shape of the island-size distribution, even before it affects the mean island density. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Ames National Laboratory
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 278767
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 7 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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