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O: Fachverband Oberflächenphysik
O 81: Oxides and Insulator Surfaces I
O 81.2: Vortrag
Donnerstag, 10. März 2016, 11:00–11:15, H4
Surface structure of Fe3O4(110) investigated by Scanning Tunneling Microscopy and Density Functional Theory. — •Brian Walls, Olaf Lübben, and Igor V. Shvets — School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College Dublin, Dublin 2, Ireland
We have performed a combined Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT) study of the (110) surface of single crystalline magnetite (Fe3O4). The (110)-terminated surface consists of two alternating planes, namely the A and B planes. Previous STM studies of the Fe3O4(110) surface have shown an A-plane terminated row reconstruction [1,2]. However, in this work STM measurements reveal not just the row reconstruction, but also an atomically flat surface structure which is present when the rows break. Interestingly, this flat structure lies just ∼3Å below the adjacent rows.
DFT calculations were performed in order to gain an understanding of the flat structure. The calculations indicate that the presence of vacancies leads to an energetically favourable model and a good match between simulated STM images (Tersoff-Hamann scheme) and experimental images.
References:
1. R. Jansen et al., Surf. Sci. 328, 237-247 (1995).
2. G. Maris et al., Surf. Sci. 600, 5084-5091 (2006).