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Large magnetoresistance in oxide based ferromagnet / superconductor spin switches

Published online by Cambridge University Press:  26 February 2011

V. Peña ,
N. Nemes ,
C. Visani ,
J. Garcia-Barriocanal ,
F. Bruno ,
D. Arias ,
Z. Sefrioui ,
C. Leon ,
S. G. E. Te Velthuis  and
A. Hoffmann
...Show all authors
V. Peña
Affiliation:
vpenahid@fis.ucm.es
N. Nemes
Affiliation:
nemes@icmm.csic.es
C. Visani
Affiliation:
visani@fis.ucm.es
J. Garcia-Barriocanal
Affiliation:
jgarciab@fis.ucm.es
F. Bruno
Affiliation:
fbruno@fis.ucm.es, Spain
D. Arias
Affiliation:
darias@fis.ucm.es
Z. Sefrioui
Affiliation:
sefrioui@fis.ucm.es
C. Leon
Affiliation:
carletas@fis.ucm.es
S. G. E. Te Velthuis
Affiliation:
teveltuis@anl.gov
A. Hoffmann
Affiliation:
hoffmann@anl.gov
M. Garcia-Hernandez
Affiliation:
marmar@icmm.csic.es
Jacobo Santamaría
Affiliation:
jacsan@fis.ucm.es, U. Complutense. Facultad de Fisica, GFMC. Depto Fisica Aplicada, Spain
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Abstract

We report large magnetoresistance (in excess of 1000%) in ferromagnet / superconductor / ferromagnet structures made of La0.7Ca0.3MnO3 and YBa2Cu3O7 in the current in plane (CIP) geometry. This magnetoresistance has many of the ingredients of the giant magnetoresistance of metallic superlattices: it is independent on the angle between current and magnetic field, depends on the relative orientation of the magnetization in the ferromagnetic layers, and takes very large values. The origin is enhanced scattering at the F/S interface in the anti parallel configuration of the magnetizations. Furthermore, we examine the dependence of the magnetoresistance effect on the thickness of the superconducting layer, and show that the magnetoresistance dies out for thickness in excess of 30 nm, setting a length scale for the diffusion of spin polarized quasiparticles.

Keywords

magnetoresistance (transport)superconductingspintronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 887: Symposium Q – Degradation Processes in Nanostructured Materials , 2005 , 0887-Q11-02
Copyright
Copyright © Materials Research Society 2006

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References

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