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O: Fachverband Oberflächenphysik
O 56: Metal substrates: Epitaxy, growth and adsorbates
O 56.9: Vortrag
Donnerstag, 26. März 2009, 17:00–17:15, SCH A316
Novel mechanism of growth of atomic wires on (110) surfaces driven by intermixing — Oleg V. Stepanyuk1, •Nikolay N. Negulyaev2, Pavel A. Ignatiev3, Marek Przybylski3, Wolfram Hergert2, Alexander M. Saletsky1, and Jürgen Kirschner3 — 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 reveal a novel mechanism of nanowire growth on fcc (110) metal surfaces, which is promoted by interface intermixing of deposited and substrate atoms. We present a theoretical investigation of the self-assembly of 1D nanostructures during room temperature thermal deposition of Fe and Co atoms on Pd(110) in the sub-monolayer regime. Calculations performed by means of density functional theory demonstrate that incorporation of the deposited Fe (Co) atoms into the topmost substrate layer is energetically and kinetically feasible at room temperature. Kinetic Monte Carlo simulations based on ab initio calculated diffusion barriers of relevant atomic processes indicate that the surface diffusion of expelled substrate atoms is responsible for the growth of atomic wires consisting mainly of Pd atoms. We suggest that scanning tunneling spectroscopy could allow to distinguish between Fe (Co) and Pd atomic chains on Pd(110) to confirm our predictions.