Fabrication and properties of high- Tc YBCO josephson junction and SQUID with variable thickness bridges by focused ion beam

Chiu Hsien Wu, Fong Jyun Jhan, Jau Han Chen, Jen Tzong Jeng, Kuen Lin Chen, Hong Chang Yang

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7 Citations (Scopus)


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- Tc YBa2Cu3Oy 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 μV at 70 K. The properties of one junction and SQUID magnetometer have been investigated.

Original languageEnglish
Article number5699961
Pages (from-to)375-378
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3 PART 1
Publication statusPublished - 2011 Jun 1



  • Focused ion beam
  • Josephson junction
  • Variable thickness bridges

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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