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Vortex ratchets based on asymmetric arrays of Josephson junctions

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journal contribution
posted on 2019-11-05, 09:46 authored by Boris Chesca, Jonathan Cox, Daniel John, Sergey SavelievSergey Saveliev, Christopher Mellor
Magnetic 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 Experiment

Volume

2019

Publisher

IOP Publishing

Version

  • 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/ab3bc6

Acceptance date

2019-08-05

Publication date

2019-11-04

Copyright date

2019

ISSN

1742-5468

Language

  • en

Depositor

Dr Boris Chesca Deposit date: 4 November 2019

Article number

114001

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