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Enhancement of longitudinal Kerr rotation in Fe/Al2O3 composite multilayers

Published online by Cambridge University Press:  01 October 2002

A. Bourzami ,
O. Lenoble ,
J. F. Bobo ,
A. Layadi  and
M. Piecuch
A. Bourzami*
Affiliation:
Institut de Physique, Université Ferhat Abbas de Sétif, 19000, Algeria
O. Lenoble
Affiliation:
LPM-UMR CNRS 7556, Université Henri Poincaré de Nancy 1, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
J. F. Bobo
Affiliation:
LPMC-UMR CNRS 5830-INSA, Dépt. Génie Physique, 31077 Toulouse Cedex 4, France
A. Layadi
Affiliation:
Institut de Physique, Université Ferhat Abbas de Sétif, 19000, Algeria
M. Piecuch
Affiliation:
LPM-UMR CNRS 7556, Université Henri Poincaré de Nancy 1, BP 239, 54506 Vandœuvre-lès-Nancy Cedex, France
*
[email protected]
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Abstract

We present experimental results on longitudinal magneto-optic Kerr effect in composite systems based on thin Fe layers associated with amorphous alumina (Al2O3). [Al2O3/Fe]m-samples ($m=1,\,2$) have been prepared by rf magnetron sputtering onto Si(100) substrate. We have investigated the effect of the Al2O3 and Fe thicknesses on the Kerr rotation. The geometry of the multilayers is predicted theoretically by using deduced experimental magneto-optical constants. It will be shown how large Kerr rotation values can be obtained by adjusting sample parameters. For instance, a Kerr rotation close to 7° has been observed from an Al2O3/Fe/Al2O3/Fe/Si multilayer. The reflectivity and the figure of merit are discussed as a function of the Al2O3 thickness.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 20 , Issue 1 , October 2002 , pp. 9 - 14
Copyright
© EDP Sciences, 2002

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