Ketteler, G.

Ranke, W.

English

MPG.PuRe

   Preprint of the Department of Inorganic Chemistry, Fritz -Haber-Institute of the MPG (for personal use only) (www.fhi-berlin.mpg.de/ac) 1      EMRS Spring Meeting June 18-21, 2002, Strasbourg, France Oral contribution  Self-assembled Fe3O4(111) nanostructures in ultrathin FeO(111) films on Ru(0001)   G. Ketteler, W. Ranke*   Department of Inorganic Chemistry, Fritz-Haber-Institute of the MPG, Faradayweg 4-6, 14195 Berlin, Germany   * Corresponding author: e-mail ranke@fhi-berlin.mpg.de, phone +49 30 8413 4523, fax +49 30 8413 4401  Submitted 15 March 2001; accepted 17 July 2001  Abstract Ultrathin films of FeO(111) can be grown on Ru(0001) by repeated cycles of evaporation of Fe and subsequent oxi-dation at temperatures around 870K. At equilibrium conditions, 1-2 ML FeO(111) wet the substrate before further growth proceeds by the formation of Fe3O4(111) islands (Stranski-Krastanov growth mode). However, if larger amounts of Fe are deposited in one turn on the substrate and oxidized afterwards, metastable FeO(111) films with a thickness up to 4 ML can be obtained. They have strongly expanded lattice constants and form specific coincidence structures with the Ru(0001) substrate. In films with a thickness of ~4ML, self-assembled, periodically arranged Fe3O4(111) nanodomains with diameters of ~2-3nm form in the FeO(111) film. Further oxidation causes these do-mains to grow and finally coalesce into a closed Fe3O4(111) film. Self-organization and phase transition are dis-cussed using thermodynamic and electrostatic arguments.  

Self-assembled Fe<sub>3</sub>O<sub>4</sub>(111) nanostructures in ultrathin FeO(111) films on Ru(0001)

http://hdl.handle.net/11858/00-001M-0000-0011-1497-3

Self-assembled Fe<sub>3</sub>O<sub>4</sub>(111) nanostructures in ultrathin FeO(111) films on Ru(0001)

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