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Novel Defects and Anisotropic Vacancy Diffusion on Reconstructed Surfaces

Published online by Cambridge University Press:  10 February 2011

O. Rodríguez De La Fuente ,
M. A. González  and
J. M. Rojo
O. Rodríguez De La Fuente
Affiliation:
Dpto. de Física de Materiales, Universidad Complutense, E-28040, Madrid, Spain
M. A. González
Affiliation:
Dpto. de Física de Materiales, Universidad Complutense, E-28040, Madrid, Spain
J. M. Rojo
Affiliation:
Dpto. de Física de Materiales, Universidad Complutense, E-28040, Madrid, Spain
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Abstract

STM and molecular dynamics simulations are used to study Au(001) 5×25 reconstructed surfaces after Ar+ bombardment at 600 eV and ion doses from 0.05 to 1 ML+. Surface 2D dislocation dipoles, identified as such in a previous investigation, are shown to have dislocation properties and to be formed by anisotropic diffusion of surface vacancies along the ridges of the reconstructed topmost layer. A new vacancy diffusion mechanism involving intermediate states with de-localized vacancies is identified. Increasing ion fluences is shown to lead to the formation of vacancy islands that are nucleated at the dislocation dipoles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 585: Symposium L – Fundamental Mechanisms of Low-Energy-Beam Modified Surface , 1999 , 3
Copyright
Copyright © Materials Research Society 2000

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