Scaling of island densities in submonolayer growth of binary alloys

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Author list: Einax M, Ziehm S, Dieterich W, Maass P

Publisher: AMERICAN PHYSICAL SOC

Place: COLLEGE PK

Publication year: 2007

Journal acronym: PHYS REV LETT

Volume number: 99

Issue number: 1

Number of pages: 4

ISSN: 0031-9007

Languages: English-Great Britain (EN-GB)

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Abstract

We study the nucleation kinetics of binary alloys formed by codeposition of A and B atoms onto a planar substrate with fluxes F-alpha (alpha=A, B). Based on a generalization of mean-field rate equations, we derive scaling relations for the dependence of the number density of stable islands on the ratios D-alpha/F-alpha, where D-alpha are the diffusion coefficients of two types of adatoms. Novel scaling laws are predicted for different situations of cluster stabilities with respect to their size and composition. The predictions are validated by kinetic Monte Carlo simulations and can be tested in experiments.

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