Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)

O 15.64: Poster

Freitag, 4. März 2005, 17:00–20:00, Poster TU D

Formation of Ag islands on Ag(111) using atomic force microscopy in the dynamic mode — •Rene Schmidt, Michaela Zeyer-Düsterer, Alexander Schwarz, and Roland Wiesendanger — Institut für Angewandte Physik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg

Ag vacancy and adatom islands on Ag(111) have been frequently regarded as a test system to study the growth and dynamics of 2D-nanostructures. Conventionally, such structures are created by argon ion bombardment and subsequent heating. However, in this study we utilized atomic force microscopy in the dynamic mode to create and image vacancy and adatom islands on flat Ag(111) terraces. Their formation occurs when the tip enters the repulsive interaction regime. Non-invasive stable imaging on the resulting structures is possible in the non-contact attractive regime. The application of local force spectroscopy enables to examine the growth mechanism in more detail. Particularly, the influence of external parameters like the applied repulsive force and the oscillation amplitude on the island size are evaluated.