Stimulation of a Singlet Superconductivity in SFS Weak Links by Spin-Exchange Scattering of Cooper Pairs
SAMOKHVALOV, A. V.
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
BUZDIN, Alexandre I.
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
SAMOKHVALOV, A. V.
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
Institute for Physics of Microstructures of the RAS
Lobachevsky State University of Nizhny Novgorod
BUZDIN, Alexandre I.
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
< Réduire
Institut universitaire de France [IUF]
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Langue
en
Article de revue
Ce document a été publié dans
Scientific Reports. 2014-07-11, vol. 4, p. 5671 (1-5)
Nature Publishing Group
Résumé en anglais
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 ...Lire la suite >
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.< Réduire
Mots clés en anglais
spintronics
superconductinf properties and materials
Projet Européen
New Century of Superconductivity: Ideas, Materials, Technologies
Project ANR
Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs - ANR-12-BS04-0016
Origine
Importé de halUnités de recherche