Enhanced Supercurrents in Josephson Junctions Containing Nonparallel Ferromagnetic Domains

ROBINSON J. W., A.; HALA'SZ, Ga'Bor B.; BUZDIN, Alexandre I.; BLAMIRE M., G.

doi:10.1103/PhysRevLett.104.207001

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ROBINSON J. W., A.
Department of Material Science and Metallurgy

HALA'SZ, Ga'Bor B.
Department of Material Science and Metallurgy

BUZDIN, Alexandre I.
Centre de physique moléculaire optique et hertzienne [CPMOH]
Institut universitaire de France [IUF]

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Ce document a été publié dans

Physical Review Letters. 2010-05-21, vol. 104, n° 20, p. 207001 (1-4)

American Physical Society

Résumé en anglais

\pi 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 [Bergeret et al., Phys. Rev. Lett. 86, 3140 (2001); Blanter et al., Phys. Rev. B 69, 024525 (2004)].< Réduire

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