Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.56: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Growth of nanostructures on fcc(110) metal surfaces at the atomic scale — •Oleg V. Stepanyuk1,2,3, Nikolay N. Negulyaev2, Pavel A. Ignatiev3, Wolfram Hergert2, and Alexander M. Saletsky1 — 1Faculty of Physics, Moscow State University, 119899 Moscow, Russia — 2Fachbereich Physik, Martin-Luther-Universität, D06099 Halle, Germany — 3Max-Planck-Institut für Mikrostrukturphysik, D06120 Halle, Germany
We report on an unusual mechanism of atomic-scale structures growth on fcc(110) metal surfaces, which is promoted by interface intermixing of deposited and substrate atoms. We investigate a self-assembly of 1D and 2D nanostructures during thermal deposition of 3d atoms on Pd(110) [1] and Cu(110) [2] surfaces at different temperatures. Diffusion barriers of basic atomic events are calculated by means of density functional theory. Incorporation of deposited 3d atoms into the topmost substrate layer is found to be energetically and kinetically feasible in the examined interval of temperatures (120-350 K). Kinetic Monte Carlo model for atomic self-organization demonstrates that surface nanostructures consist mainly of expelled substrate atoms, while deposited 3d magnetic atoms are embedded into the topmost surface layer [1, 2]. Recently our theoretical predictions have been confirmed by experiments [3]. Magnetic properties of novel nanostructures are also discussed.
[1] Stepanyuk O.V., et al., Phys. Rev. B 78, 113406 (2008). [2] Stepanyuk O.V., et al., Phys. Rev. B 79, 155410 (2009). [3] Wei D.H., et al., Phys. Rev. Lett. 103, 225504 (2009).