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Universal mB/T Scaling of the Giant Magnetoresistance in Cu-Co Granular Ribbons Produced by Controlled Melt-Spinning

Published online by Cambridge University Press:  15 February 2011

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

Studies of the evolution of electrical resistance in an external applied magnetic field, B, as well as with temperature, T, on Cu86Co14 and Cu92Co8 as quenched and annealed melt-spun ribbons, reveal that magnetoresistance, MR, ΔR(B,T)=R(B)-R(0) scales with B/T. Furthermore, it found that annealing up to 600 °C scales the magnetic moment of the Co-rich superparamagnetic nanoparticles such that, the data for the field dependence of the MR obtained at various temperatures collapses onto the same unique and universal curve f(mB/T) with the Langevin variable mB/T governing the overall behaviour.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 384: Symposium L – Magnetic Ultrathin films, Multilayers and Surfaces , 1995 , 541
Copyright
Copyright © Materials Research Society 1995

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References

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