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The Effect of Strain on Intra- and Interlayer Mass Transport in Metal Epitaxy

Published online by Cambridge University Press:  21 February 2011

H. Brune ,
K. Bromann  and
K. Kern
H. Brune
Affiliation:
Institut de Physique Expérimental, EPFL, CH-1015 Lausanne, Switzerland
K. Bromann
Affiliation:
Institut de Physique Expérimental, EPFL, CH-1015 Lausanne, Switzerland
K. Kern
Affiliation:
Institut de Physique Expérimental, EPFL, CH-1015 Lausanne, Switzerland
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Abstract

A general concept is shown how to measure both the barriers for terrace and step-down diffusion for an epitaxial system. It is based on the application of mean-field nucleation theory to variable temperature STM data. With this approach we studied the influence of strain on intra- and interlayer diffusion for Ag self diffusion on strained and unstrained Ag(111) surfaces. The strained surface was the first Ag layer that grows pseudomorphically on Pt(111) and is thus under 4.2% compressive strain. The barrier for terrace diffusion is observed to be substantially lower on the strained, compared to the unstrained Ag/Ag(111) case, 60±10 meV and 97±10 meV, respectively. The additional barrier for interlayer diffusion decreases from 120±15 meV for Ag(111) homoepitaxy to only 30±5 meV for diffusion from the strained Ag layer down to the Pt(111) substrate. These examples illustrate the considerable effect of strain on the intra- and interlayer mass transport. They require a new concept of layer dependent nucleation kinetics for heteroepitaxial systems in general.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 399: Symposium D – Evolution of Epitaxial Structure and Morphology , 1995 , 213
Copyright
Copyright © Materials Research Society 1996

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References

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