Instability in the current-biased 0-π Josephson junction
A. B. Kuklov, V. S. Boyko, J. Malinsky
DOI 10.1103/PhysRevB.51.11965 · Physical Review B
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Abstract
A current-biased contact between 0 and π Josephson junctions containing the spontaneous magnetic half-vortex is considered. It has been shown that under certain values of the external current (30–50 % less than the critical Josephson’s current far from the contact) this half-vortex becomes unstable with respect to transforming into the anti-half-vortex and creating a single Josephson-integer magnetic vortex which is to be swept away from the contact by the bias. A steady condition for a series of such events generation can be achieved for the single symmetrical contact. We suggest that these effects can be employed to identify the half-flux in an artificially made Josephson junction as well as in a granular superconductor. We also conjecture that the half-vortex can be utilized in superconducting memory and logic devices.
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