A device with two orthogonal low-Tc SQUID gradiometers - A comparison of series and parallel gradiometric SQUID's

K. Yokosawa; D. Suzuki; K. Tsukada; A. Tsukamoto

doi:10.1109/TASC.2003.814018

A device with two orthogonal low-T_c SQUID gradiometers - A comparison of series and parallel gradiometric SQUID's

K. Yokosawa, D. Suzuki, K. Tsukada, A. Tsukamoto

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

We have developed a planar gradiometric device with two orthogonal SQUID gradiometers integrated on a substrate. In developing this new device, both series- and parallel-type gradiometric SQUID's (without pickup coils) suitable for the same pickup coils were fabricated. The parasitic inductance, parasitic areas, and cross talks of each SQUID were evaluated to compare their performances. Next, to evaluate the effects of changing field on the SQUID's, the critical current reduction and noise increase under an applied magnetic field were measured. These results show that the parallel SQUID is superior to the series SQUID; thus the parallel SQUID was chosen for use in the new single-chip gradiometric device.

Original language	English
Pages (from-to)	727-730
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	13
Issue number	2 I
DOIs	https://doi.org/10.1109/TASC.2003.814018
Publication status	Published - Jun 2003
Externally published	Yes
Event	2002 Applied Superconductivity Conference - Houston, TX, United States Duration: Aug 4 2002 → Aug 9 2002

Keywords

Gradiometer
Orthogonal
Planar
SQUID

ASJC Scopus subject areas

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

Access to Document

10.1109/TASC.2003.814018

Cite this

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title = "A device with two orthogonal low-Tc SQUID gradiometers - A comparison of series and parallel gradiometric SQUID's",

abstract = "We have developed a planar gradiometric device with two orthogonal SQUID gradiometers integrated on a substrate. In developing this new device, both series- and parallel-type gradiometric SQUID's (without pickup coils) suitable for the same pickup coils were fabricated. The parasitic inductance, parasitic areas, and cross talks of each SQUID were evaluated to compare their performances. Next, to evaluate the effects of changing field on the SQUID's, the critical current reduction and noise increase under an applied magnetic field were measured. These results show that the parallel SQUID is superior to the series SQUID; thus the parallel SQUID was chosen for use in the new single-chip gradiometric device.",

keywords = "Gradiometer, Orthogonal, Planar, SQUID",

author = "K. Yokosawa and D. Suzuki and K. Tsukada and A. Tsukamoto",

note = "Funding Information: Manuscript received August 6, 2002. This work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO) under Grant 0711008. K. Yokosawa, D. Suzuki, and K. Tsukada are with the Central Research Laboratory, Hitachi, Ltd., Tokyo 185-8601, Japan (e-mail: yokosawa@crl.hi-tachi.co.jp). A. Tsukamoto is with the Advanced Research Laboratory, Hitachi, Ltd., Tokyo 185-8601, Japan. Digital Object Identifier 10.1109/TASC.2003.814018 Fig. 1. Structure of a gradiometric device with two orthogonal SQUID gradiometers.; 2002 Applied Superconductivity Conference ; Conference date: 04-08-2002 Through 09-08-2002",

year = "2003",

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AU - Yokosawa, K.

AU - Suzuki, D.

AU - Tsukada, K.

AU - Tsukamoto, A.

N1 - Funding Information: Manuscript received August 6, 2002. This work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO) under Grant 0711008. K. Yokosawa, D. Suzuki, and K. Tsukada are with the Central Research Laboratory, Hitachi, Ltd., Tokyo 185-8601, Japan (e-mail: yokosawa@crl.hi-tachi.co.jp). A. Tsukamoto is with the Advanced Research Laboratory, Hitachi, Ltd., Tokyo 185-8601, Japan. Digital Object Identifier 10.1109/TASC.2003.814018 Fig. 1. Structure of a gradiometric device with two orthogonal SQUID gradiometers.

PY - 2003/6

Y1 - 2003/6

N2 - We have developed a planar gradiometric device with two orthogonal SQUID gradiometers integrated on a substrate. In developing this new device, both series- and parallel-type gradiometric SQUID's (without pickup coils) suitable for the same pickup coils were fabricated. The parasitic inductance, parasitic areas, and cross talks of each SQUID were evaluated to compare their performances. Next, to evaluate the effects of changing field on the SQUID's, the critical current reduction and noise increase under an applied magnetic field were measured. These results show that the parallel SQUID is superior to the series SQUID; thus the parallel SQUID was chosen for use in the new single-chip gradiometric device.

AB - We have developed a planar gradiometric device with two orthogonal SQUID gradiometers integrated on a substrate. In developing this new device, both series- and parallel-type gradiometric SQUID's (without pickup coils) suitable for the same pickup coils were fabricated. The parasitic inductance, parasitic areas, and cross talks of each SQUID were evaluated to compare their performances. Next, to evaluate the effects of changing field on the SQUID's, the critical current reduction and noise increase under an applied magnetic field were measured. These results show that the parallel SQUID is superior to the series SQUID; thus the parallel SQUID was chosen for use in the new single-chip gradiometric device.

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