Double proximity effect in hybrid planar Superconductor-(Normal metal/Ferromagnet)-Superconductor structures

We have investigated the differential resistance of hybrid planar Al-(Cu/Fe)-Al submicron bridges at low temperatures and in weak magnetic fields. The structure consists of Cu/Fe-bilayer forming a bridge between two superconducting Al-electrodes. In superconducting state of Al-electrodes, we have ob...

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Bibliographic Details
Published in:arXiv.org 2012-02
Main Authors: Golikova, Tatiana E, Huebler, Florian, Beckmann, Detlef, Batov, Igor E, Tatiana Yu Karminskaya, Mikhail Yu Kupriyanov, Golubov, Alexander A, Ryazanov, Valery V
Format: Article
Language:English
Subjects:
Aluminum
Coercivity
Copper
Electrode polarization
Electrodes
Electron spin
Ferromagnetism
Iron
Magnetism
Polarization (spin alignment)
Proximity effect (electricity)
Superconductivity
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Summary:We have investigated the differential resistance of hybrid planar Al-(Cu/Fe)-Al submicron bridges at low temperatures and in weak magnetic fields. The structure consists of Cu/Fe-bilayer forming a bridge between two superconducting Al-electrodes. In superconducting state of Al-electrodes, we have observed a double-peak peculiarity in differential resistance of the S-(N/F)-S structures at a bias voltage corresponding to the minigap. We claim that this effect (the doubling of the minigap) is due to an electron spin polarization in the normal metal which is induced by the ferromagnet. We have demonstrated that the double-peak peculiarity is converted to a single peak at a coercive applied field corresponding to zero magnetization of the Fe-layer.
ISSN:2331-8422
DOI:10.48550/arxiv.1202.5460