Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5421361 | Surface Science | 2017 | 19 Pages |
Abstract
Growth of two-dimensional superstructure and island morphologies of silver atoms evaporated on a nickel (100) surface are studied by scanning tunneling microscopy. Near-equilibrium islands form at moderate annealing temperature (lower than 500Â K) and present two kinds of morphologies. While they share a common monolayer c(2Ã8) superstructure, two distinct populations of islands coexist: rounded islands grown on the surface and spindle-shaped islands grown inside the Ni surface. The latter present a clear saturation of their density with increasing coverage. These shapes are mostly dominated by boundary energies as confirmed by a simple two-dimensional Wulff model whose parameters are derived using molecular statics simulations. Further annealing to 700Â K leads to long Ag strips decorating the Ni step edges.
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Authors
J.B. Marie, I. Braems, A. Bellec, C. Chacon, J. Creuze, Y. Girard, S. Gueddani, J. Lagoute, V. Repain, S. Rousset,