Field- and current controlled switching between vortex states in a mesoscopic superconductor
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 153, no 1, 012027- p.Article in journal (Refereed) Published
We study the controllable manipulation of vortices in a mesoscopic, superconducting "island" of Nb, using an integrated Josephson junction as a field-sensitive vortex detector. The island, divided by a single Josephson junction and suspended by Nb microbridges, was fabricated from a Nb/P11-xNix/Nb tri-layer using a focused ion beam. We find that the system at select magnetic fields behaves as a vortex memory cell, where current pulses can be used to switch the vortex configuration between metastable states of distinctly different junction critical currents. Non-destructive read-out of a state is then easily done with an intermediate current. Furthermore, we show that the Josephson junction displays a strong magnetoresistive effect at current bias well above the junction critical current but below the onset of flux flow. This enables the junction to be used as a quantitative probe of magnetic field with better than single flux quantum resolution.
Place, publisher, year, edition, pages
2009. Vol. 153, no 1, 012027- p.
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-33659DOI: 10.1088/1742-6596/153/1/012027OAI: oai:DiVA.org:su-33659DiVA: diva2:283314