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Kinetic Roughening of Fe/Fe(100) Epitaxial Thin Films

Published online by Cambridge University Press:  21 February 2011

M.C. Bartelt  and
J.W. Evans
M.C. Bartelt
Affiliation:
IPRT, and Ames Laboratory, Iowa State University, Ames, Iowa 50011
J.W. Evans
Affiliation:
Department of Mathematics, and Ames Laboratory, Iowa State University, Ames, Iowa 50011
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Abstract

We model kinetic roughening during Fe(100) homoepitaxy, where the formation of mounds with selected slope has been observed. Our model incorporates irreversible nucleation and growth of two-dimensional square islands in each layer, and a step-edge barrier to diffusive downward transport (which exceeds the barrier, Ed, to terrace diffusion by ESch). We estimate that ESch≈45meV compared with Ed≈450meV. To reproduce observed behavior, it is also essential for the model to incorporate "downward funneling" of depositing atoms to four-fold hollow adsorption sites, as this controls slope selection. Finally, we discuss model predictions for the non-monotonic temperature dependence of kinetic roughening.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 399: Symposium D – Evolution of Epitaxial Structure and Morphology , 1995 , 89
Copyright
Copyright © Materials Research Society 1996

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References

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