Enhanced supercurrents in josephson junctions containing nonparallel ferromagnetic domains

J. W.A. Robinson; Gábor B. Halász; A. I. Buzdin; M. G. Blamire

doi:10.1103/PhysRevLett.104.207001

Enhanced supercurrents in josephson junctions containing nonparallel ferromagnetic domains

J. W.A. Robinson
, Gábor B. Halász
, A. I. Buzdin
, M. G. Blamire

Research output: Contribution to journal › Article › peer-review

95 Scopus citations

Abstract

π coupling may arise when a ferromagnet forms a link between two superconductors of an artificial Josephson junction. Using a trilayer Fe/Cr/Fe barrier in which the Cr thickness determines the alignment of the Fe layers, we show that the critical currents are substantially enhanced in the antiparallel configuration. The result agrees with existing superconductor-ferromagnet proximity theory according to which the phase-controlling effects of ferromagnets on Cooper pairs can be minimized by arranging their moments in a nonparallel way.

Original language	English
Article number	207001
Journal	Physical Review Letters
Volume	104
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.104.207001
State	Published - May 18 2010
Externally published	Yes

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10.1103/PhysRevLett.104.207001

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abstract = "π coupling may arise when a ferromagnet forms a link between two superconductors of an artificial Josephson junction. Using a trilayer Fe/Cr/Fe barrier in which the Cr thickness determines the alignment of the Fe layers, we show that the critical currents are substantially enhanced in the antiparallel configuration. The result agrees with existing superconductor-ferromagnet proximity theory according to which the phase-controlling effects of ferromagnets on Cooper pairs can be minimized by arranging their moments in a nonparallel way.",

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AU - Robinson, J. W.A.

AU - Halász, Gábor B.

AU - Buzdin, A. I.

AU - Blamire, M. G.

PY - 2010/5/18

Y1 - 2010/5/18

N2 - π coupling may arise when a ferromagnet forms a link between two superconductors of an artificial Josephson junction. Using a trilayer Fe/Cr/Fe barrier in which the Cr thickness determines the alignment of the Fe layers, we show that the critical currents are substantially enhanced in the antiparallel configuration. The result agrees with existing superconductor-ferromagnet proximity theory according to which the phase-controlling effects of ferromagnets on Cooper pairs can be minimized by arranging their moments in a nonparallel way.

AB - π coupling may arise when a ferromagnet forms a link between two superconductors of an artificial Josephson junction. Using a trilayer Fe/Cr/Fe barrier in which the Cr thickness determines the alignment of the Fe layers, we show that the critical currents are substantially enhanced in the antiparallel configuration. The result agrees with existing superconductor-ferromagnet proximity theory according to which the phase-controlling effects of ferromagnets on Cooper pairs can be minimized by arranging their moments in a nonparallel way.

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Enhanced supercurrents in josephson junctions containing nonparallel ferromagnetic domains

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