%0 Journal Article
%A Peña, V.
%A Sefrioui, Zouhair
%A Arias Serna, Diego
%A León Yebra, Carlos
%A Santamaría Sánchez-Barriga, Jacobo
%A Martínez, J. L.
%A te Velthuis, S. G. E.
%A Hoffmann, A.
%T Giant magnetoresistance in ferromagnet/superconductor superlattices
%D 2005
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/51424
%X We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La_(0.7)Ca_(0.3)MnO_(3) and high-T_(c) superconducting YBa_(2)Cu_(3)O_(7). This large magnetoresistance is reminiscent of the giant magnetoresistance (GMR) in metallic superlattices but with much larger values, and originates at spin imbalance due to the injection of spin-polarized carriers. Furthermore, in contrast to ordinary GMR, the magnetoresistance is intimately related to the superconductivity in the YBa_(2)Cu_(3)O_(7) layer and vanishes in the normal state. This result, aside from its fundamental importance, may be of interest for the design of novel spintronic devices based on ferromagnet/superconductor structures.
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