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Crystallographic Structure of Cobalt Films on CU (100)

Published online by Cambridge University Press:  03 September 2012

O. Heckmann ,
H. Magnan ,
P. Le Fevre  and
D. Chandesris
O. Heckmann
Affiliation:
LURE, Université de Paris Sud F-91405 ORSAY, France
H. Magnan
Affiliation:
and SRSIM, CEA Saclay F-91191 GIF sur YVETTE, France
P. Le Fevre
Affiliation:
LURE, Université de Paris Sud F-91405 ORSAY, France
D. Chandesris
Affiliation:
LURE, Université de Paris Sud F-91405 ORSAY, France
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Abstract

The stable structure of cobalt is hexagonal closed packed (hep), but cobalt can be stabilized in the face centered cubic structure (fee) by epitaxy on Cu (100). These films are ferromagnetic with [110] in plane easy axis. The Magnetic anisotropies of these films strongly depend on their structure, and in particular to the possible deviation from the isotropie fee structure. We have studied these films by surface EXAF.S. By recording the spectra both in normal incidence and in grazing incidence we have shown that the Co/Cu (100) films have a face centered tetragonal structure: the mean nearest neighbour distance parallel to the surface is 2.55 Å (same value as in bulk copper) and the interlayer bonds length is 2.50 Å (same value as in bulk cobalt). We conclude that the films are in perfect epitaxy on copper (100) with a contraction of the lattice parameter perpendicular to the surface of 4%. A constant tetragonalization is observed for films of 2 to 15 Monolayers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 313: Symposium Q1 – Magnetic Ultrathin Films, Multilayers and Surfaces/Magnetic Interfaces-Physics and Characterizations , 1993 , 245
Copyright
Copyright © Materials Research Society 1993

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References

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