Low-Tc SQUIDs with a built-in heater module to remove flux trapping

Koichi Yokosawa, Daisuke Suzuki, Keiji Tsukada, Seiichi Ugai, Toshiaki Suzuki, Yasushi Shimizu

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We have fabricated low-Tc SQUIDs (superconducting quantum interference devices) that have a built-in heater module next to the Josephson junctions to remove trapped flux by using only a low heating power. To suppress the generation of magnetic fields, the heater module comprises a double-layer consisting of a heater, which is a narrow Nb film, and an Al electrode. The module can be fabricated together with the SQUID without complicating the process. The Nb heater is transformed to normal metal with sufficient resistance when a current above the critical current flows through it. We demonstrated that the heater module could reliably remove trapped flux with 24 mW without increasing any noise of the SQUID or causing re-trapping.

Original languageEnglish
Pages (from-to)1286-1291
Number of pages6
JournalSuperconductor Science and Technology
Issue number8
Publication statusPublished - Aug 1 2000
Externally publishedYes
EventThe SMART/SUPERMAT Conference - Giens, France
Duration: Sept 19 1999Sept 23 1999

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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