SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 25: Poster: Metal Substrates

O 25.5: Poster

Monday, March 27, 2023, 18:00–20:00, P2/EG

Cobalt Island Growth on Metallic Surfaces — •Bensu Günay, Christophe Nacci, and Leonhard Grill — University of Graz, Graz, Austria

Molecular-beam epitaxy is an important technique for the fabrication of epitaxial films with reduced dimensionality in the low coverage regime under ultra-high vacuum conditions [1]. Various parameters are important for the morphology of the nanostructures: the flux of the incident atoms, the surface temperature, the source/substrate geometry, and diffusion of the atoms on the surface [2]. In this study, we investigated the growth of cobalt islands on Cu(111) and Au(111) surfaces using different (K-cell and e-beam evaporator) evaporators. The resulting surfaces were then studied by complementary methods: x-ray photoemission spectroscopy (XPS) to analyze the chemical composition of the surface and scanning tunneling microscopy (STM) to investigate the morphology of the islands. The results show how different deposition conditions change the Co growth on the surface.

[1] Prieto, J. E., de La Figuera, J., & Miranda, R. (2000). Surface energetics in a heteroepitaxial model system: Co/Cu (111). Physical Review B, 62(3), 2126. [2] Negulyaev, N. N., Stepanyuk, V. S., Bruno, P., Diekhöner, L., Wahl, P., & Kern, K. (2008). Bilayer growth of nanoscale Co islands on Cu (111). Physical Review B, 77(12), 125437.