Giant magnetoresistance in ferromagnet/superconductor superlattices

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...

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Detalles Bibliográficos
Autores: Peña, V., Sefrioui, Zouhair, Arias Serna, Diego, León Yebra, Carlos, Santamaría Sánchez-Barriga, Jacobo, Martínez, J. L., te Velthuis, S. G. E., Hoffmann, A.
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/51424
Acceso en línea:https://hdl.handle.net/20.500.14352/51424
Access Level:acceso abierto
Palabra clave:537
Tunnel-junctions
Superconductor
Layers.
Electricidad
Electrónica (Física)
2202.03 Electricidad
Descripción
Sumario: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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