Bistability in superconducting rings containing an inhomogeneous Josephson junction

M. Gaass, S. Nadj-Perge, Z. Radović, A. Bauer, M. Aprili, W. Wegscheider, and C. Strunk
Phys. Rev. B 77, 024506 – Published 11 January 2008

Abstract

We investigate the magnetic response of a superconducting Nb ring containing a ferromagnetic PdNi Josephson junction and a tunnel junction in parallel. Doubling of the switching frequency is observed within certain intervals of the external magnetic field. For sinusoidal current-phase relations in both junctions, our model of a double superconducting quantum interference device (a small two-junction loop that interrupts the larger ring) explains this feature by a sequence of current reversals in the ferromagnetic section of the junction in these field intervals. The switching anomalies are induced by the coupling between the magnetic fluxes in the two superconducting loops.

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  • Received 26 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.024506

©2008 American Physical Society

Authors & Affiliations

M. Gaass1, S. Nadj-Perge2,*, Z. Radović2, A. Bauer1, M. Aprili3, W. Wegscheider1, and C. Strunk1

  • 1Institute for Experimental and Applied Physics, University of Regensburg, 93025 Regensburg, Germany
  • 2Department of Physics, University of Belgrade, P.O. Box 368, 11001 Belgrade, Serbia
  • 3Laboratoire de Physique des Solides, CNRS, UMR 8502, Université Paris-Sud, 91405 Orsay Cedex, France

  • *Present address: Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, the Netherlands.

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Vol. 77, Iss. 2 — 1 January 2008

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