Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)
O 55.54: Poster
Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F
SPA-LEED investigations on the growth of NiO films on MgO passivated Ag(001) — •Lars Boewer1, Bernd Zimmermann2, and Joachim Wollschlaeger2 — 1Fakultät Physik / DELTA, Technische Universität Dortmund, D-44221 Dortmund — 2Fachbereich Physik, Universität Osnabrück, D-49076 Osnabrück
Thin oxide films are important for nanoelectronic devices. For instance, they serve as tunneling barriers for tunneling magneto resistors (TMR). NiO is used for TMR devices due to its antiferromagnetic properties.
In this work we studied the growth of NiO on Ag(001) as model for lattice matched oxide films on metals. In addition, we deposited MgO films, which are also lattice matched, prior to the deposition of NiO to passivate the Ag substrate and to avoid alloying of Ni and Ag.
Oxide films were prepared by MBE of metals (Ni or Mg) in oxygen atmosphere at room temperature. The stoichiometry was investigated by AES. SPA-LEED was used to study the morphology of the oxide films at different growth stages. The NiO film initially nucleates with islands of two monolayer height. After completion of 2ML the growth continues in the layer-by-layer growth mode. Finally, we observe the formation of mosaics due to misfit dislocations.