Interference phenomena and long-range proximity effect in superconductor/ferromagnet systems

27th International Conference on Low Temperature Physics

Buzdin, A.I.^1 ; Samokhvalov, A.V.^2,3 ; Shekhter, R.I.^4

University of Bordeaux, LOMA UMR-CNRS 5798, F-33405, France^1

Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod

603950, Russia^2

Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod

603950, Russia^3

Department of Physics, University of Gothenburg, Goteborg

SE-412 96, Sweden^4

关键词: Ballistic regime;    Interference mechanisms;    Interference phenomena;    Josephson current;    Magnetic scattering;    Proximity effects;    Spin-flip scattering;    Total momentum;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022007/pdf
DOI  :  10.1088/1742-6596/568/2/022007

来源: IOP

【 摘 要 】

We study The novel interference mechanism of The long-range proximity effect in superconductor/ferromagnet/superconductor (SFS) structures in The ballistic regime. Even a small non-collinear magnetic domain near The center of a ferromagnetic weak link is shown to restore The singlet supercurrent inherent to The normal metal. The underlying physics of The effect is The magnetic scattering of The Cooper pair by The domain, which reverses total momentum of The pair in The ferromagnet and thus compensates The phase gain before and after The spin-flip scattering. The above phenomenon opens a way to easily control The properties of SFS junctions and, inversely, to manipulate The magnetic moment via The Josephson current.