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Magnetic field tunable vortex diode made of YBa2Cu3O7−δ Josephson junction asymmetrical arrays

Chesca, Boris; John, Daniel; Pollett, Richard; Gaifullin, Marat; Cox, Jonathan; Mellor, Christopher; Savelev, Sergey

Authors

Boris Chesca

Daniel John

Richard Pollett

Marat Gaifullin

Jonathan Cox

Christopher Mellor

Sergey Savelev



Abstract

Several Josephson ratchets designed as asymmetrically structured parallel-series arrays of Josephson junctions made of YBa2Cu3O7−δ have been fabricated. From the current-voltage characteristics measured for various values of applied magnetic field, B, in the temperature range of 10–89 K, we demonstrate that the devices work as magnetic field-tunable highly reversible vortex diodes. Thus, at 89 K, the ratchet efficiency η could be reversed from +60% to −60% with a change in B as small as 3 μT. By decreasing the operation temperature, η improves up to −95% at 10 K while the dynamics in the B-tunability degrades. The ratchet designs we propose here can be used to control unidirectional vortex flow vortices in superconducting devices as well as building integrated nano-magnetic sensors. Numerical simulations qualitatively confirm our experimental findings and also provide insight into the related and more general problem of the control of the transport of nano/quantum objects in thin films.

Journal Article Type Article
Journal Applied Physics Letters
Print ISSN 0003-6951
Electronic ISSN 0003-6951
Publisher AIP Publishing
Peer Reviewed Peer Reviewed
Volume 111
Issue 6
APA6 Citation Chesca, B., John, D., Pollett, R., Gaifullin, M., Cox, J., Mellor, C., & Savelev, S. (in press). Magnetic field tunable vortex diode made of YBa2Cu3O7−δ Josephson junction asymmetrical arrays. Applied Physics Letters, 111(6), doi:10.1063/1.4997741
DOI https://doi.org/10.1063/1.4997741
Publisher URL http://aip.scitation.org/doi/10.1063/1.4997741
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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