Giant magnetoresistance in ferromagnet/superconductor superlattices

V. Peña; Z. Sefrioui; D. Arias; C. Leon; J. Santamaria; J. L. Martinez; S. G.E. Te Velthuis; A. Hoffmann

doi:10.1103/PhysRevLett.94.057002

Giant magnetoresistance in ferromagnet/superconductor superlattices

V. Peña, Z. Sefrioui, D. Arias, C. Leon, J. Santamaria, J. L. Martinez, S. G.E. Te Velthuis, A. Hoffmann

Research output: Contribution to journal › Article

Abstract

We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La_0.7Ca_0.3MnO₃ and high-T _c superconducting YBa₂Cu₃O₇. 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 YBa₂Cu₃O₇ 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.

Original language	English (US)
Article number	057002
Journal	Physical review letters
Volume	94
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.94.057002
State	Published - Feb 11 2005
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.94.057002

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Peña, V., Sefrioui, Z., Arias, D., Leon, C., Santamaria, J., Martinez, J. L., Te Velthuis, S. G. E., & Hoffmann, A. (2005). Giant magnetoresistance in ferromagnet/superconductor superlattices. Physical review letters, 94(5), [057002]. https://doi.org/10.1103/PhysRevLett.94.057002

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abstract = "We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La0.7Ca0.3MnO3 and high-T c superconducting YBa2Cu3O7. 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 YBa2Cu3O7 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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AU - Peña, V.

AU - Sefrioui, Z.

AU - Arias, D.

AU - Leon, C.

AU - Santamaria, J.

AU - Martinez, J. L.

AU - Te Velthuis, S. G.E.

AU - Hoffmann, A.

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AB - We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La0.7Ca0.3MnO3 and high-T c superconducting YBa2Cu3O7. 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 YBa2Cu3O7 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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