Open AccessElectromigration tuning of the voltage modulation depth in YBa2Cu3O 7−δ nanowire-based SQUIDs
Author(s) -
Edoardo Trabaldo,
A. Garibaldi,
Floriana Lombardi,
Thilo Bauch
Publication year - 2021
Publication title -
superconductor science and technology/superconductor science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.033
H-Index - 105
eISSN - 1361-6668
pISSN - 0953-2048
DOI - 10.1088/1361-6668/ac1c15
Subject(s) - electromigration , materials science , superconductivity , nanowire , doping , condensed matter physics , analytical chemistry (journal) , optoelectronics , physics , chemistry , composite material , chromatography
Oxygen electromigration applied to a YBa 2 Cu 3 O 7 − δ nanowire can be used to tune its electrical properties. Here, we apply electromigration to YBCO nanowire-based superconducting quantum interference devices (SQUIDs) and study its effect on the voltage modulation depth of the devices. Using a dc electromigration current we replenish the oxygen of the weak links, improving the critical current symmetry of the SQUIDs. AC current electromigration is used to reduce the doping level of the weak links, thus reducing their critical current and increasing differential resistance. Both type of electromigration processes are found to improve the SQUIDs performance, although the best results are obtained with ac biased electromigration, which improved the voltage modulations of the SQUIDs by a factor as high as 8. This procedure can be instrumental to fine tune ex-situ the properties of superconducting electronics where a large number of weak links are required.