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O: Oberflächenphysik
O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)
O 29.74: Poster
Mittwoch, 29. März 2006, 14:30–17:30, P2
Epitaxial Cobalt Oxide Films on Ir(100) — •Chiara Giovanardi, Lutz Hammer, and Klaus Heinz — Lehrstuhl für Festkörperphysik, Universität Erlangen Nürnberg, Staudtstr. 7, D-91058 Erlangen
On various modifications of the Ir(100) surface (1×1, 5×1, 2×1-O) cobalt grows pseudomorphically up to several monolayers. Post-oxidizing a 2ML Co film grown on the 1×1 surface and subsequent annealing at around 500K leads to the formation of flat epitaxial CoO-films with rocksalt structure. In contrast to substrates like Fe(100) and Ag(100) [1,2] these CoO-films cannot grow in (100) orientation on the Ir(100) surface due to the large lattice misfit (2.72 Å vs. 3.04 Å). Instead, the film grows slightly distorted in (111) orientation giving rise to a c(10×2) superstructure. For other thicknesses and surface preparations fully relaxed CoO patches are found as well as patches with Co2O3 structure.
[1] S. Valeri et al., Surf. Sci. 423 (1999) 346
[2] Ch. Hagendorf et al., Surf. Sci. 532-535 (2003) 346