TY - JOUR
T1 - A device with two orthogonal low-Tc SQUID gradiometers - A comparison of series and parallel gradiometric SQUID's
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.
KW - Gradiometer
KW - Orthogonal
KW - Planar
KW - SQUID
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U2 - 10.1109/TASC.2003.814018
DO - 10.1109/TASC.2003.814018
M3 - Conference article
AN - SCOPUS:0042942812
VL - 13
SP - 727
EP - 730
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2 I
T2 - 2002 Applied Superconductivity Conference
Y2 - 4 August 2002 through 9 August 2002
ER -