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Investigations on Fe Lattice Strain Relaxation in the Al/Fe/Al Trilayer

Published online by Cambridge University Press:  15 February 2011

Robert A. Mayanovic
Affiliation:
Dept. of Physics and Astronomy, Southwest Missouri State University., Springfield, MO 65804.
Carlos J. Gutierrez
Affiliation:
Dept. of Physics,Southwest Texas State University, San Marcos, TX 78666.
Gary A. Prinz
Affiliation:
Naval Research Laboratory, Washington, DC 20375.
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Abstract

We have measured polarization-dependent Fe K-edge XAFS spectra from an epitaxially-grown Al/Fe/Al/ZnSe/GaAs(001) sample using synchrotron radiation. The Fourier-transformed XAFS spectra were fit up to four coordination shells simultaneously using theoretical spectra generated with FEFF 6. Our results reveal a small tetragonal distortion of the bcc α-Fe film lattice towards a contraction in the film growth direction (c=2.863 Å and a=2.874 Å; bulk a=2.867 Å). The anomalous tetragonal distortion is consistent with a model involving substantial interdifussion of Fe and Al, leading to Fe1−xAlx alloy formation localized in the interface regions.

Type
Research Article
Copyright
Copyright © Materials Research Society 1996

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