HIGH-TEMPERATURE SUPERCONDUCTING GRADIOMETRIC SQUIDS AND FLUX TRANSFORMERS

被引:4
作者
KEENE, MN
CHEW, NG
GOODYEAR, SW
EDWARDS, JA
HUMPHREYS, RG
LANDER, K
SATCHELL, JS
机构
[1] DRA, Malvern, Worcestershire WR14 3PS, St Andrews Road
来源
PHYSICA C | 1994年 / 230卷 / 1-2期
关键词
D O I
10.1016/0921-4534(94)90451-0
中图分类号
O59 [应用物理学];
学科分类号
摘要
Gradiometric DC superconducting quantum interference devices (SQUIDs) have been constructed from thin-film YBa2Cu3O7-x on MgO substrates. The SQUIDs were fabricated as first-order gradiometers with PrBa2Cu3O7-x insulator providing electrical isolation at the crossovers. Highly symmetrical first-order gradiometer flux transformers have also been fabricated. These couple to the SQUIDs and enhance the sensitivity to magnetic-field gradients. Each flux transformer has two 20 turn flat spiral SQUID input coils and a pair of larger-area balanced pickup coils. Flux transformers with both parallel and series configured pickup loops have been fabricated. When coupled to a SQUID as a flip chip, one gradiometer was operated at 77 K with a gradient sensitivity of (0.79 +/- 0.03) nT/m/root Hz at 10 Hz and (2.0 +/- 0.1) nT/m/root Hz at 1 Hz.
引用
收藏
页码:110 / 114
页数:5
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