Double proximity effect in hybrid planar superconductor-(normal metal/ferromagnet)-superconductor structures

T. E. Golikova, F. Hübler, D. Beckmann, I. E. Batov, T. Yu. Karminskaya, M. Yu. Kupriyanov, A. A. Golubov, and V. V. Ryazanov
Phys. Rev. B 86, 064416 – Published 13 August 2012

Abstract

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 a Cu/Fe bilayer forming a bridge between two superconducting Al electrodes. In the 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 splitting 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.

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  • Received 24 February 2012

DOI:https://doi.org/10.1103/PhysRevB.86.064416

©2012 American Physical Society

Authors & Affiliations

T. E. Golikova1,*, F. Hübler2, D. Beckmann2, I. E. Batov1, T. Yu. Karminskaya3, M. Yu. Kupriyanov3, A. A. Golubov4, and V. V. Ryazanov1,5

  • 1Institute of Solid State Physics, RAS, 142432 Chernogolovka, Moscow District, Russia
  • 2Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
  • 3Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moscow 119991, Russia
  • 4Faculty of Science and Technology and MESA + Institute of Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
  • 5Russian Quantum Center, 2-d Spasonalivkovsky pereulok 4, Moscow 119991, Russia

  • *golt2@list.ru

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Issue

Vol. 86, Iss. 6 — 1 August 2012

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