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New BCT Iron Phase in (100) Felr Superlattices

Published online by Cambridge University Press:  03 September 2012

S. Andrieu ,
J. Hübsch ,
M. Piecuch ,
L. Hennet  and
H. FISCHER
S. Andrieu
Affiliation:
Laboratoire Mixte CNRS-St GOBAIN, 54704, Pont-à-Mousson France
J. Hübsch
Affiliation:
Laboratoire de Cristallographie, Univ. Nancy I, 54506, Vandoeuvre France
M. Piecuch
Affiliation:
Laboratoire Mixte CNRS-St GOBAIN, 54704, Pont-à-Mousson France
L. Hennet
Affiliation:
Laboratoire Mixte CNRS-St GOBAIN, 54704, Pont-à-Mousson France
H. FISCHER
Affiliation:
Laboratoire Mixte CNRS-St GOBAIN, 54704, Pont-à-Mousson France
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Abstract

In this paper, the synthesis of a new structure of iron in (100) Felr superlattices grown by Molecular Beam Epitaxy is reported. Two-dimensional growth up to 4 planes at 400K occurs, as shown by RHEED oscillations. Electron diffraction also gives evidence that the Fe lattice is pseudomorphic to the Ir one during the 2D-growth, and relaxes to the bcc lattice for thicker deposits. An X-Ray analysis shows that the Fe structure is a body centered tetragonal one with a c/a ratio close to 1.25. This phase is observed to be non-Magnetic at room temperature, as a weak ferromagnetic behaviour is observed at low temperatures, except at small Ir thicknesses. This is the evidence of the existence of a low spin phase which seems to undergo a second order phase transition with the atomic volume of iron.

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 , 473
Copyright
Copyright © Materials Research Society 1993

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