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Structural Transformations Due to Intermixing During Deposition oF Fe/Pt(001) Epitaxial Multilayers

Published online by Cambridge University Press:  10 February 2011

T. C. Hufnagel ,
M. C. Kautzky ,
V. Ramaswamy ,
A. Leming  and
B. M. Clemens
T. C. Hufnagel
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-2205
M. C. Kautzky
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-2205
V. Ramaswamy
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-2205
A. Leming
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-2205
B. M. Clemens
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305-2205
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Abstract

Previous studies of the structure of epitaxial Fe/Pt(001) multilayers have shown that the structure of the Fe layers depends on the Fe layer thickness. For small thicknesses (< 12 Å) the Fe is fcc, while for greater thicknesses (> 22 Å) the Fe has a bcc structure. We speculated that this transition of the Fe structure is a result of intermixing with subsequently deposited Pt. We explore this transition further by examining superlattice satellite peaks around the (111) fundamental reflection, and by using grazing incidence x-ray scattering (GIXS) to examine the structure of epitaxial Fe/Pt(001) multilayers during sputter deposition. The GIXS observations show that the initial growth of Fe is in the bcc structure; thin bcc Fe layers are partially transformed to fcc by subsequent deposition of Pt. The transformation is thermodynamically favorable because the intermixed fcc phase has lower epitaxial mismatch and bulk chemical free energy than the bcc phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 441: Thin Films – Structure and Morphology , 1996 , 367
Copyright
Copyright © Materials Research Society 1997

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References

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