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

doi:10.1088/0953-2048/13/8/401

Low-T_c 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 journal › Conference article › peer-review

3 Citations (Scopus)

Abstract

We have fabricated low-T_c 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 language	English
Pages (from-to)	1286-1291
Number of pages	6
Journal	Superconductor Science and Technology
Volume	13
Issue number	8
DOIs	https://doi.org/10.1088/0953-2048/13/8/401
Publication status	Published - Aug 1 2000
Externally published	Yes
Event	The SMART/SUPERMAT Conference - Giens, France Duration: Sept 19 1999 → Sept 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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10.1088/0953-2048/13/8/401

Cite this

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title = "Low-Tc SQUIDs with a built-in heater module to remove flux trapping",

abstract = "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.",

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T1 - Low-Tc SQUIDs with a built-in heater module to remove flux trapping

AU - Yokosawa, Koichi

AU - Suzuki, Daisuke

AU - Tsukada, Keiji

AU - Ugai, Seiichi

AU - Suzuki, Toshiaki

AU - Shimizu, Yasushi

PY - 2000/8/1

Y1 - 2000/8/1

N2 - 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.

AB - 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.

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

Abstract

ASJC Scopus subject areas

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