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O: Fachverband Oberflächenphysik
O 56: Metal substrates: Epitaxy, growth and adsorbates
O 56.8: Talk
Thursday, March 26, 2009, 16:45–17:00, SCH A316
Growth on nanopatterned gold surfaces — •yasmine nahas1,2, vincent repain1, and sylvie rousset1 — 1Laboratory Material and Quantum Phenomena, University Paris 7, UMR 7162, 10 rue Alice Domon et Léonie Duquet, 75205 Paris, France — 2Physikalisches Institut, Universität Karlsruhe (TH), Wolfgang-Gaede-Str., D-76131, Karlsruhe, Germany
The magnetic properties of nanometer size objects cause a large interest in technological applications as well as in the fundamental point of view. Ordered growth allows to obtain controlled size and density structures, as shown by the Co/Au(788) system and others [1]. Although basic mechanisms for this ordered growth have been found out, the complexity of atomistic processes on surfaces (and especially on nanopatterned ones) makes the behaviour of such system generally very surprising. I will show variable temperature experiments of the growth of various elements (Fe, Pt, Co, Au) on different naturally patterned surfaces (Au(111) and Au(788)). I will extract some common features to these systems but I will also explain how the thermodynamic properties of each element (crystallographic phase, lattice parameter, binary phase diagram ...) have a strong influence on some characteristics of the nucleation and growth process. Finally, results on the ordered growth of codeposited iron and platinum atoms will be shown. Different experiments varying the relative concentration of iron and the substrate temperature will be discussed in the framework of the nucleation and growth kinetic theory.
[1] V. Repain et al., J. Phys.: Condens. Matter. 18 (2006) S17-S28