JJ Vortex ratchets.pdf (1.1 MB)
Vortex ratchets based on asymmetric arrays of Josephson junctions
journal contribution
posted on 2019-11-05, 09:46 authored by Boris Chesca, Jonathan Cox, Daniel John, Sergey SavelievSergey Saveliev, Christopher MellorMagnetic vortex ratchet effects in various designs of asymmetric arrays of
Josephson junctions (JJs) ratchets have been simulated numerically and measured
experimentally. Asymmetry in the designs is achieved by spatial asymmetric
variations of either the critical current (jc) of the JJ or the area (A) of the
superconducting loops in between the JJ or both. It was found that larger arrays
result in larger ratchet efficiency and are less susceptible to noise fluctuations. The
simulation results were compared with measurements of various designs of JJ
arrays ratchets made of YBa2Cu3O7-δ thin film superconductor and having either
asymmetric or symmetric loop areas. We demonstrate that the ratchet efficiency can
be very efficiently tuned by an applied magnetic field. Such vortex ratchets could be
used as vortex diodes to pump out Josephson vortices from sensitive
superconducting electronic or as sensitive magnetic sensors.
History
School
- Science
Department
- Physics
Published in
Journal of Statistical Mechanics: Theory and ExperimentVolume
2019Publisher
IOP PublishingVersion
- AM (Accepted Manuscript)
Publisher statement
This is an author-created, un-copyedited version of an article published in Journal of Statistical Mechanics: Theory and Experiment . IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1742-5468/ab3bc6Acceptance date
2019-08-05Publication date
2019-11-04Copyright date
2019ISSN
1742-5468Publisher version
Language
- en
Depositor
Dr Boris Chesca Deposit date: 4 November 2019Article number
114001Usage metrics
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