How Pb-Overlayer Islands Move Fast Enough to Self-Assemble on Pb-Cu Surface Alloys

M. L. Anderson, N. C. Bartelt, P. J. Feibelman, B. S. Swartzentruber, and G. L. Kellogg
Phys. Rev. Lett. 98, 096106 – Published 2 March 2007

Abstract

Low-energy electron microscopy reveals that two-dimensional, 50000 atom, Pb-overlayer and vacancy islands both have diffusion coefficients of 25.6±0.8nm2/sec at 400°C on Pb-Cu surface alloys. This high mobility, key to self-assembly in this system, results from the fast transport of Pb atoms on the surface alloy and of Cu through the Pb overlayer. A high Pb vacancy concentration, predicted by ab initio calculations, facilitates the latter.

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  • Received 31 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.096106

©2007 American Physical Society

Authors & Affiliations

M. L. Anderson1, N. C. Bartelt2, P. J. Feibelman1, B. S. Swartzentruber1, and G. L. Kellogg1

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
  • 2Sandia National Laboratories, Livermore, California 94550, USA

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Vol. 98, Iss. 9 — 2 March 2007

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