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Article Dans Une Revue Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces Année : 2009

Theoretical study of the Ni growth on Pt stepped surfaces

Résumé

We have investigated the growth of Ni on Pt stepped surfaces with (1 1 1) terraces by means of potentials derived from the second moment approximation in a tight-binding model. The activation energies associated to these processes are determined. The Schwoebel barriers of Ni atoms descending steps of Pt stepped surfaces are calculated for different kinds of straight steps (A and B steps) differing by the orientation of the ledge. In addition, we study the diffusion of Ni adatoms at fcc or hcp sites in the presence of small adislands on the terraces, in the vicinity of the A and B steps. We show that a good estimate of the potential wells and diffusion barriers could be given by introducing a lateral effective pair interaction model, the interactions extending up to the next nearest neighbors. Finally, we have carried out Kinetic Monte-Carlo simulations to investigate the Ni wire formation at Pt step edges and the influence of the exchange processes in the alloy formation.

Dates et versions

hal-00484800 , version 1 (19-05-2010)

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Citer

Wafaa Essolaani, Hedia Garbouj, Moncef Said, Fabien Picaud, Christophe Ramseyer, et al.. Theoretical study of the Ni growth on Pt stepped surfaces. Surface Science : A Journal Devoted to the Physics and Chemistry of Interfaces, 2009, 603 (18), pp.2879-2887. ⟨10.1016/j.susc.2009.07.036⟩. ⟨hal-00484800⟩
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