Magnetic field tunable vortex diode made of YBaCuO Josephson junction asymmetrical arrays
journal contributionposted on 2017-08-18, 15:10 authored by Boris Chesca, Daniel John, Richard Pollett, Marat Gaifullin, Jonathan Cox, Christopher Mellor, Sergey SavelievSergey Saveliev
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.
Published inApplied Physics Letters
Pages062602 - 062602 (5)
CitationCHESCA, B. ... et al, 2017. Magnetic field tunable vortex diode made of YBaCuO Josephson junction asymmetrical arrays. Applied Physics Letters, 111 (6), pp. 062602-062602 (5).
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NotesThis article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in CHESCA, B. ... et al, 2017. Magnetic field tunable vortex diode made of YBaCuO Josephson junction asymmetrical arrays. Applied Physics Letters, 111 (6), pp. 062602-062602 (5). and may be found at http://dx.doi.org/10.1063/1.4997741