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Determination of the Upper Limit for the Cluster Moment Contributing the Giant Magneto Resistance in Laser Deposited Granular Cu-rich Thin Films

Published online by Cambridge University Press:  10 February 2011

V. Madurga ,
R. J. Ortega ,
J. Vergara  and
K. V. Rao
V. Madurga
Affiliation:
Departamento de Física, Universidad Pública de Navarra, E-31006 Pamplona, Spain.
R. J. Ortega
Affiliation:
Departamento de Física, Universidad Pública de Navarra, E-31006 Pamplona, Spain. Department of Condensed Matter Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden.
J. Vergara
Affiliation:
Departamento de Física, Universidad Pública de Navarra, E-31006 Pamplona, Spain. Department of Condensed Matter Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden.
K. V. Rao
Affiliation:
Department of Condensed Matter Physics, Royal Institute of Technology, S-10044 Stockholm, Sweden.
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Abstract

We have fabricated granular Cu95Co5 thin films by laser ablation-deposition. Within a regime of annealing temperatures, these samples exhibit Giant Magneto Resistance (GMR), typically 5% in 0.5 Tesla at 5 K. The magnetic hysteresis loops are found to show finite coercive fields in the whole temperature range 2 K - 300 K. Below 9 K, the field dependence of the MR shows a split maximum. We interpret the data in terms of coercivity arising from blocking phenomenon of single domain superparamagnetic Co clusters. A quantitative determination of the upper limit for the cluster moment contributing to GMR is estimated to be 17000 μB (a cluster size of 5 nm).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 483
Copyright
Copyright © Materials Research Society 1997

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References

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