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O: Oberflächenphysik

O 37: Epitaxie und Wachstum (III)

O 37.7: Vortrag

Freitag, 30. März 2001, 12:45–13:00, B

STM study of Co growth on oxygen covered Cu(110) surfaces — •G. Boishin, L.D. Sun, M. Hohage, and P. Zeppenfeld — Institute of Experimental Physics, Johannes-Kepler-University Linz, A-4040 Linz, Austria

The growth of Co on the Cu(110)-(2×1)O surface and on the Cu-CuO stripe phase has been studied. Depositing submonolayer amounts of Co on the Cu-CuO stripe phase leads to the substitution of Cu atoms in the Cu-O rows. The excess Cu either forms Cu-islands on the bare Cu-areas or is incorporated in Cu-Co-O compound structures similar to the ones observed for Cu(110)-(2×1)O [1]. In addition, narrow Cu-Co-O-bridges connecting neighboring Cu-O stripes are formed. Cobalt films grown on the oxygen covered Cu(110) surface show different surface reconstructions, namely (2×1), (3×1) or (4×1), depending on the initial oxygen coverage. These (n×1) structures consist of atomic rows running along the [001] direction with every n-th row missing along the [110] direction. In particular, the (3×1) reconstructed Co film (with a thickness of about 11 ML) is found to be almost atomically flat in agreement with He scattering data.

[1] W. Ling et al., Surf. Sci. 450 (2000) 227.