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Morphological Transition of Epitaxial Rhodium (111)

Published online by Cambridge University Press:  21 February 2011

Frank Tsui ,
Joanne Wellman ,
Ctirad Uher  and
Roy Clarke
Frank Tsui
Affiliation:
Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255, tsui@physics.unc.edu
Joanne Wellman
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Roy Clarke
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
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Abstract

We report a global morphological transition in the nucleation and growth of epitaxial Rh (111). The transition occurs near 600 K, about 1/4 of the Rh melting temperature, and is signaled by a change in the shape of the surface features from fingered to compact. The transition appears to be related to a change in the critical nucleation size from 1 to 2 atoms. On both sides of the transition, there lies a regime of persistent layer-by-layer growth indicated by a minimum in surface roughness and by the presence of RHEED oscillations. The general surface features exhibit well defined length scales that are not self-affine, and as growth proceeds they increase in size following a power-law dependence on film thickness with a temperature-independent exponent of 0.33 ± 0.03. The results suggest a general pathway to the layer-by-layer growth of close-packed metals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 399: Symposium D – Evolution of Epitaxial Structure and Morphology , 1995 , 243
Copyright
Copyright © Materials Research Society 1996

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References

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