Measurement of Shift in Voltage-Flux Characteristics of SQUID Having Washer Coil Due to Flux-Trapping

Eriko TAKEDA; Toshikazu NISHINO; Kazumasa TAKAGI

Measurement of Shift in Voltage-Flux Characteristics of SQUID Having Washer Coil Due to Flux-Trapping

Eriko TAKEDA, Toshikazu NISHINO, Kazumasa TAKAGI

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The relationship between the flux-trapping phenomenon and the device-structure of a SQUID has been studied using three types of SQUIDs; a SQUID with a guard-ring, a SQUID with a moat, and a SQUID without these structures. The change in the voltage-flux characteristics of the SQUIDs due to the flux-trapping are measured. For the measurements, an acceleration of the flux-trapping is realized by applying a magnetic field during cooling of the SQUIDs. From the measured results, the SQUID with the guard-ring and that with the moat can reject tha external magnetic field more effectively than the SQUID without these structures. The reason of the difference in the rejection of the external magnetic field is thought to be the existence of superconducting closed loops. However, the flux-trapping of the SQUID with the guard-ring and that with the moat occur more easily than the flux-trapping of the SQUID without these structures for the cooling under the finite magnetic field. Therefore, the moat structure and the guard-ring structure need a higher-grade magnetic shielding for a practical use.

Publication: IEICE TRANSACTIONS on Electronics Vol.E78-C No.5 pp.526-530

Publication Date: 1995/05/25

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Type of Manuscript: Special Section PAPER (Special Issue on Superconducting Electronics and Its Applications)

Category: SQUID sensor and multi-channel SQUID system

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Eriko TAKEDA, Toshikazu NISHINO, Kazumasa TAKAGI, "Measurement of Shift in Voltage-Flux Characteristics of SQUID Having Washer Coil Due to Flux-Trapping" in IEICE TRANSACTIONS on Electronics, vol. E78-C, no. 5, pp. 526-530, May 1995, doi: .
Abstract: The relationship between the flux-trapping phenomenon and the device-structure of a SQUID has been studied using three types of SQUIDs; a SQUID with a guard-ring, a SQUID with a moat, and a SQUID without these structures. The change in the voltage-flux characteristics of the SQUIDs due to the flux-trapping are measured. For the measurements, an acceleration of the flux-trapping is realized by applying a magnetic field during cooling of the SQUIDs. From the measured results, the SQUID with the guard-ring and that with the moat can reject tha external magnetic field more effectively than the SQUID without these structures. The reason of the difference in the rejection of the external magnetic field is thought to be the existence of superconducting closed loops. However, the flux-trapping of the SQUID with the guard-ring and that with the moat occur more easily than the flux-trapping of the SQUID without these structures for the cooling under the finite magnetic field. Therefore, the moat structure and the guard-ring structure need a higher-grade magnetic shielding for a practical use.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e78-c_5_526/_p

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@ARTICLE{e78-c_5_526,
author={Eriko TAKEDA, Toshikazu NISHINO, Kazumasa TAKAGI, },
journal={IEICE TRANSACTIONS on Electronics},
title={Measurement of Shift in Voltage-Flux Characteristics of SQUID Having Washer Coil Due to Flux-Trapping},
year={1995},
volume={E78-C},
number={5},
pages={526-530},
abstract={The relationship between the flux-trapping phenomenon and the device-structure of a SQUID has been studied using three types of SQUIDs; a SQUID with a guard-ring, a SQUID with a moat, and a SQUID without these structures. The change in the voltage-flux characteristics of the SQUIDs due to the flux-trapping are measured. For the measurements, an acceleration of the flux-trapping is realized by applying a magnetic field during cooling of the SQUIDs. From the measured results, the SQUID with the guard-ring and that with the moat can reject tha external magnetic field more effectively than the SQUID without these structures. The reason of the difference in the rejection of the external magnetic field is thought to be the existence of superconducting closed loops. However, the flux-trapping of the SQUID with the guard-ring and that with the moat occur more easily than the flux-trapping of the SQUID without these structures for the cooling under the finite magnetic field. Therefore, the moat structure and the guard-ring structure need a higher-grade magnetic shielding for a practical use.},
keywords={},
doi={},
ISSN={},
month={May},}

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TY - JOUR
TI - Measurement of Shift in Voltage-Flux Characteristics of SQUID Having Washer Coil Due to Flux-Trapping
T2 - IEICE TRANSACTIONS on Electronics
SP - 526
EP - 530
AU - Eriko TAKEDA
AU - Toshikazu NISHINO
AU - Kazumasa TAKAGI
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E78-C
IS - 5
JA - IEICE TRANSACTIONS on Electronics
Y1 - May 1995
AB - The relationship between the flux-trapping phenomenon and the device-structure of a SQUID has been studied using three types of SQUIDs; a SQUID with a guard-ring, a SQUID with a moat, and a SQUID without these structures. The change in the voltage-flux characteristics of the SQUIDs due to the flux-trapping are measured. For the measurements, an acceleration of the flux-trapping is realized by applying a magnetic field during cooling of the SQUIDs. From the measured results, the SQUID with the guard-ring and that with the moat can reject tha external magnetic field more effectively than the SQUID without these structures. The reason of the difference in the rejection of the external magnetic field is thought to be the existence of superconducting closed loops. However, the flux-trapping of the SQUID with the guard-ring and that with the moat occur more easily than the flux-trapping of the SQUID without these structures for the cooling under the finite magnetic field. Therefore, the moat structure and the guard-ring structure need a higher-grade magnetic shielding for a practical use.
ER -