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

Chesca, Boris and John, Daniel and Pollett, Richard and Gaifullin, Marat and Cox, Jonathan and Mellor, Christopher and Savelev, Sergey (2017) Magnetic field tunable vortex diode made of YBa2Cu3O7−δ Josephson junction asymmetrical arrays. Applied Physics Letters, 111 (6). 062602. ISSN 0003-6951

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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.

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1063/1.4997741
Depositing User: Eprints, Support
Date Deposited: 07 Sep 2017 10:41
Last Modified: 08 Sep 2017 12:10
URI: http://eprints.nottingham.ac.uk/id/eprint/45527

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