Fabrication and Properties of High- T c YBCO Josephson Junction and SQUID With Variable Thickness Bridges by Focused Ion Beam

Fabrication and Properties of High- T c YBCO Josephson Junction and SQUID With Variable Thickness Bridges by Focused Ion Beam

We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2011-06, Vol.21 (3), p.375-378
Hauptverfasser: Wu, Chiu-Hsien, Jhan, Fong-Jyun, Chen, Jau-Han, Jeng, Jen-Tzong, Chen, Kuen-Lin, Yang, Hong-Chang
Format: Artikel
Sprache:eng
Schlagworte:
Bridges (structures)
Ion beams
Josephson junctions
SQUID magnetometers
SQUIDs
Superconducting quantum interference devices
Variable thickness
YBCO superconductors
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Zusammenfassung:We have successfully fabricated YBCO Josephson junctions and SQUIDs with variable thickness bridges. The variable-thickness bridges of YBCO thin film were fabricated by photolithography and Focused ion beam mill. The Josephson effects of variable thickness bridges were obtained in a 80 nm-thick-film of high- T c YBa 2 Cu 3 O y . The Shapiro steps were observed in single junction in the gigahertz range from 3.02 to 14.64 GHz. The voltage-current and voltage-field characteristics were measured in SQUID magnetometer. The SQUID shows a peak-to-peak voltage swing of 1.5 mu V at 70 K. The properties of one junction and SQUID magnetometer have been investigated.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2010.2100352