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Kinetic Roughening in Epitaxial Growth of Bcc (110) Films

Published online by Cambridge University Press:  15 February 2011

Helmut Fritzsche  and
Ulrich Gradmann
Helmut Fritzsche
Affiliation:
Physikalisches Instiutut, Technische Universität Clausthal, D 3392 Clausthal-Zellerfeld, Germany
Ulrich Gradmann
Affiliation:
Physikalisches Instiutut, Technische Universität Clausthal, D 3392 Clausthal-Zellerfeld, Germany
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Abstract

For the epitaxial growth of bcc(110) metals on bcc(110) metal substrates, there is a general tendency for roughening by formation of quasi-periodic ridges along [001], with up-and-down staircases in the [110] direction. It can be detected by high angular resolution Spot Profile Analysis (SPA)-LEED, as has been done previously by Hahn et al. for the case of W(110) on W(110). We found this kinetic facetting for Fe(110) on Fe(110), where it can be described by the model of layer restricted diffusion (LRD) epitaxy. We observed the same phenomenon for Fe(110) on W(110), Fe(110) on Cr(110), Cr(110) on W(110) and Cr(110) on Fe(110). In this paper, we present data for Fe(110) on Cr(110). The change between sharp single spots for in-phase energies to double spots for out-of-phase energies documents the staircase facet structure; it can be used to measure a vertical strain in the films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 312: Symposium P – Common Themes and Mechanisms of Epitaxial Growth , 1993 , 321
Copyright
Copyright © Materials Research Society 1993

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