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Dynamics and stability of nanostructures on metal surfaces |
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| Authors: | G Rosenfeld K Morgenstern M Esser G Comsa |
| Institution: | Faculty of Applied Physics and MESA+ Research Institute, University of Twente, P.O. Box 217, NL-7500 AE Enschede, The Netherlands (Fax: +31-53/489-1101, E-mail: g.rosenfeld@tn.utwente.nl), NL Institute of Condensed Matter Physics, University of Lausanne, CH-1015 Lausanne, Switzerland, CH Institut für Physikalische und Theoretische Chemie der Universit?t Bonn, Wegelerstrasse 12, 53115 Bonn, Germany, DE |
| Abstract: | Ultrathin metal films consisting of two-dimensional clusters are typically unstable: the cluster ensemble has the tendency to reduce its total free energy via Ostwald ripening or dynamic coalescence of mobile clusters. In this paper we give an overview of recent model experiments addressing these coarsening mechanisms. The experiments have been performed using STM on ensembles consisting of adatom or vacancy clusters with typical diameters in the nanometer range on fcc(111)-metal surfaces. Agreement with and deviations from conventional theories are discussed. Received: 29 March 1999 / Accepted: 17 August 1999 / Published online: 30 September 1999 |
| Keywords: | PACS: 68 55 -a 68 35 Fx 68 65 +g 61 16 Ch |
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