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O: Fachverband Oberflächenphysik

O 14: Metal Substrates: Epitaxy and Growth

O 14.8: Vortrag

Montag, 26. März 2007, 16:00–16:15, H39

The initial growth of silver on Pt(111) revisited — •Esther van Vroonhoven and Bene Poelsema — Solid State Physics, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands

Ultrathin films of silver on Pt(111) are quite commonly considered as a model system for surface confined alloying: If deposited (or heated) at, or above, 550 K the first monolayer has been reported to initially form an alloy, followed by de-alloying towards monolayer completion [1].

New mesoscopic measurements, performed with LEEM, reveal evidence for yet unanticipated and highly complex behaviour. Various unanticipated and complex process, governed by different aspects of stress and strain, determine the evolution of the growing film. They include alloying, de-alloying, segregation, re-entrant partial alloying and gradual de-alloying.

As will be shown and discussed, the concept of a neatly behaving, simple model system for surface confined alloying need substantial revison.

[1] H. Roeder, R. Schuster, H. Brune and K. Kern, Phys. Rev. Lett. 71, 2086 (1994)