Dresden 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DS: Dünne Schichten

DS 24: Poster presentation

DS 24.8: Poster

Dienstag, 28. März 2006, 15:00–17:30, P2

Decorated twin boundaries in homoepitaxy on Ir(111) — •Sebastian Bleikamp¹, Arne Thoma¹, Gerhard Pirug², and Thomas Michely¹ — ¹I. Physikalisches Institut, RWTH Aachen University, 52056 Aachen, Germany — ²Institut für Schichten und Grenzflächen, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

Scanning tunneling microscopy and low energy electron diffraction were used to investigate the growth of thin Ir films on Ir(111).

A transition from the expected layer-by-layer to a defect dominated growth mode with a fixed lateral length scale and increasing roughness is observed. During growth the majority of the film area is stably transformed to twinned stacking. This transition is driven by the energetic avoidance for the formation of intrinsic stacking faults compared to two independent twin faults, and the existance of preferential nucleation sites at incoherent twin boundaries. These boundaries are decorated by rows of atoms (decoration rows) which replicate themselves in subsequently grown layers and determine the kinetics of growth and stacking.