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Spin-dependent magnetoresistance of ferromagnet/superconductor/ferromagnet La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7-δ)/La_(0.7)Ca_(0.3)MnO_(3) trilayers

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Visani, C. and Peña, V. and Garcia Barriocanal, Javier and Arias Serna, Diego and Sefrioui, Zouhair and León Yebra, Carlos and Santamaría Sánchez-Barriga, Jacobo and Nemes, Norbert Marcel and García Hernández, M. and Martínez, J. L. and te Velthuis, S. G. E. and Hoffmann, A. (2007) Spin-dependent magnetoresistance of ferromagnet/superconductor/ferromagnet La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7-δ)/La_(0.7)Ca_(0.3)MnO_(3) trilayers. Physical review B, 75 (5). ISSN 1098-0121

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Official URL: http://dx.doi.org/10.1103/PhysRevB.75.054501


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Abstract

We report on large magnetoresistance in ferromagnet/superconductor/ferromagnet trilayer structures made of La_(0.7)Ca_(0.3)MnO_(3) and YBa_(2)Cu_(3)O_(7). We find that the shape and height of the magnetoresistance peaks are not modified when the relative orientation of current and magnetic field is changed from parallel to perpendicular. Furthermore, we find that the temperature shift of the resistance curves is independent of current and of the sweep rate of the magnetic field. These observations favor the view that the magnetoresistance phenomenon originates in the spin dependent transport of quasiparticles transmitted from the ferromagnetic electrodes into the superconductor, and rule out interpretations in terms of spontaneous vortices or anisotropic magnetoresistance of the ferromagnetic layers.


Item Type:Article
Additional Information:

© 2007 The American Physical Society. Work supported by MCYT MAT 2005-06024. Work at Argonne Laboratory was sponsored by the U.S. Department of Energy, Office of Basic Energy Science under Contract No. DE-AC02-06CH11357. N.N.M. is supported by the Juan de la Cierva Program of the Spanish Ministry of Education.

Uncontrolled Keywords:Superconductor junctions; Superlattices; Ferromagnet; Multilayers; Imbalance; Magnetism.
Subjects:Sciences > Physics > Electricity
Sciences > Physics > Electronics
ID Code:30544
Deposited On:01 Jun 2015 09:53
Last Modified:10 Dec 2018 14:58

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