SAMOKHVALOV, A. V.; SHEKHTER, R. I.; BUZDIN, Alexandre I.

doi:10.1038/srep05671

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SAMOKHVALOV, A. V.
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod

SHEKHTER, R. I.
Department of Physics (Göthenburg)

BUZDIN, Alexandre I.
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Scientific Reports. 2014-07-11, vol. 4, p. 5671 (1-5)

Nature Publishing Group

Resumen en inglés

Josephson junctions with a ferromagnetic metal weak link reveal a very strong decrease of the critical current compared to a normal metal weak link. We demonstrate that in the ballistic regime the presence of a small region with a non-collinear magnetization near the center of a ferromagnetic weak link restores the critical current inherent to the normal metal. The above effect can be stimulated by additional electrical bias of the magnetic gate which induces a local electron depletion of ferromagnetic barrier. The underlying physics of the effect is the interference phenomena due to the magnetic scattering of the Cooper pair, which reverses its total momentum in the ferromagnet and thus compensates the phase gain before and after the spin-reversed scattering. In contrast with the widely discussed triplet long ranged proximity effect we elucidate a new singlet long ranged proximity effect. This phenomenon opens a way to easily control the properties of SFS junctions and inversely to manipulate the magnetic moment via the Josephson current.< Leer menos

Palabras clave en inglés

spintronics

superconductinf properties and materials

DOI

http://dx.doi.org/10.1038/srep05671

Proyecto europeo

New Century of Superconductivity: Ideas, Materials, Technologies

Proyecto ANR

Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs - ANR-12-BS04-0016

Orígen

Importado de Hal

Centros de investigación

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798