Bistability in superconducting rings containing an inhomogeneous Josephson junction

Details Bistability in superconducting rings containing an inhomogeneous Josephson junction Bistability in superconducting rings containing an inhomogeneous Josephson junction

2007-07-12

arxiv.org/abs/0707.1791v1

Phys. Rev. B 77, 024506 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.77.024506

We investigate the magnetic response of a superconducting Nb ring containing a ferromagnetic PdNi Josephson junction and a tunnel junction in parallel. A doubling of the switching frequency is observed within certain intervals of the external magnetic field. Assuming sinusoidal current-phase relations of both junctions our model of a dc-SQUID embedded within a superconducting 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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