1. Stimulation of a Singlet Superconductivity in SFS Weak Links by Spin-Exchange Scattering of Cooper Pairs
- Author
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R. I. Shekhter, A. V. Samokhvalov, Alexandre I. Buzdin, Institute for Physics of Microstructures of the RAS, Russian Academy of Sciences [Moscow] (RAS), Lobachevsky State University of Nizhny Novgorod, University of Nizhny Novgorod, Department of Physics (Göthenburg), University of Gothenburg (GU), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Laboratoire Ondes et Matière d'Aquitaine (LOMA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Fondation russe pour la recherche fondamentale (n.13-02-97216), Programme de l'académie des sciences de Russie 'Quantum mesoscopic and disordered structures', Ministère de l'éducation et des sciences de RF et Université d'état de Lobachevsky (agrément n° 02.B.49.21.0003), ANR-12-BS04-0016,MASH,Etats de Majorana et d'Andreev dans des circuits hybrides combinant des matériaux magnétiques et supraconducteurs(2012), European Project: 246937,EC:FP7:PEOPLE,FP7-PEOPLE-2009-IRSES,SIMTECH(2010), and Lobachevsky State University [Nizhni Novgorod]
- Subjects
Josephson effect ,FOS: Physical sciences ,Electrons ,Article ,Superconductivity (cond-mat.supr-con) ,Magnetization ,Magnetics ,Proximity effect (superconductivity) ,Nanotechnology ,Superconductivity ,Physics ,spintronics ,Multidisciplinary ,Condensed matter physics ,Spintronics ,Magnetic moment ,Scattering ,Nanowires ,Condensed Matter - Superconductivity ,Electric Conductivity ,superconductinf properties and materials ,[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] ,Metals ,Magnets ,Condensed Matter::Strongly Correlated Electrons ,Cooper pair - Abstract
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., Scientific Reports, in press [18 pages, 7 figures]
- Published
- 2014
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