Bistability in superconducting rings containing an inhomogeneous Josephson junction
M. Gaass, S. Nadj-Perge, Z. Radovi\'c, A. Bauer, M. Aprili, W., Wegscheider, C. Strunk
TL;DR
This paper studies the magnetic behavior of a superconducting Nb ring with an inhomogeneous Josephson junction, revealing bistability and frequency doubling phenomena explained by a coupled flux model.
Contribution
It introduces a model explaining frequency doubling and bistability in a superconducting ring with an inhomogeneous Josephson junction, based on flux coupling effects.
Findings
Frequency doubling of switching frequency observed
Current reversals in ferromagnetic junction explained
Coupling between fluxes causes switching anomalies
Abstract
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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