Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Metal substrates: Epitaxy and growth
O 71.4: Vortrag
Donnerstag, 25. März 2010, 15:45–16:00, H31
Rare earth metals - Au surface compounds — •Martina Corso1, 2, Matthieu Verstraete3, Frederik Schiller4, Laura Fernández1, Maider Ormaza5, Thomas Greber6, Angel Rubio3, and J. Enrique Ortega1, 3, 5 — 1Donostia International Physics Center, San Sebastián, Spain — 2Institut für Experimentalphysik, FU Berlin, Germany — 3ETSF, Centro Joxe Mari Korta, San Sebastián, Spain — 4Centro de Física de Materiales, San Sebastián, Spain — 5Departamento de Física Aplicada I, San Sebastián, Spain — 6Physik Institut, Universität Zürich, Switzerland
The high temperature reactive deposition of rare earths on Au(111) leads to the formation of surface compounds with extraordinary crystallinity. Gd on Au(111) is the most promising system we studied so far. Under specific growth parameters, we are able to obtain alloyed single- and double-layers whose optimum surface atomic structure corresponds to the GdAu2 stoichiometry. Moreover, the lattice mismatch between the GdAu2 layers and the Au substrate gives rise to a long-range periodic Moiré pattern, with a lattice parameter of 3.8 nm as detected by STM. We measured in detail with ARPES the electronic structure of the surface compound and based on theoretical calculations we identified the origin of the bands. This robust and highly ordered nanostructure is a perfect template to grow magnetic clusters. Co deposited at RT forms a regular network of homogeneously-sized dots that faithfully follow the underlying Moiré periodicity. By changing the Co coverage, we can obtain cluster arrays with areal densities up to 54 Teradots/inch2 and remanent magnetization at 300 K.