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Neutron Scattering Study of Antiferromagnetic and Ferromagnetic Coupling in Ni/Ag Multilayers

Published online by Cambridge University Press:  03 September 2012

B. Rodmacq ,
P. Burlet ,
Ph. Mangin  and
M. Hennion
B. Rodmacq
Affiliation:
CEA/Département de Recherche Fondamentale sur la Matière Condensée, BP 85X, 38041 Grenoble Cedex, France
P. Burlet
Affiliation:
CEA/Département de Recherche Fondamentale sur la Matière Condensée, BP 85X, 38041 Grenoble Cedex, France
Ph. Mangin
Affiliation:
Laboratoire de Métallurgie Physique et de Sciences des Matériaux, Université de Nancy, BP 239, 54506 Vandoeuvre Cedex, France
M. Hennion
Affiliation:
CEA/Laboratoire Léon Brillouin, Centre d'Etudes de Saclay, 91191 Gif sur Yvette Cedex, France.
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Abstract

Indirect Magnetic coupling in sputtered Ni/Ag Multilayers has been recently studied by magnetization and magnetoresistance techniques. These experiments indicate that coupling is anti ferromagnetic through 11 and 30 A of silver, and probably ferromagnetic through 20 Å. We present here direct evidence for such a magnetic coupling for all three thicknesses, as obtained from low angle neutron scattering experiments. Multilayers in which the Ag layer thickness is either 11 or 30 Å both exhibit a supplementary diffraction peak at a q value corresponding to twice the chemical period. Its evolution with both temperature and applied field confirms its purely magnetic origin. In order to study the coupling through 20 Å of silver, we prepared a multilayer in which the Ag layers are alternately 11 and 20 Å thick. In this case, we also observe a doubling of the chemical period. The coupling through 11 Å being anti ferromagnetic, this unambiguously shows that the coupling through 20 Å is ferromagnetic.

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 , 767
Copyright
Copyright © Materials Research Society 1993

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References

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