HIGHLY SENSITIVE YBA2CU3O7 DC SQUID MAGNETOMETER WITH THIN-FILM FLUX TRANSFORMER

被引：32

作者：

GRUNDLER, D ^{[1
]}

DAVID, B ^{[1
]}

ECKART, R ^{[1
]}

DOSSEL, O ^{[1
]}

机构：

[1] PHILIPS GMBH FORSCHUNGSLAB, FORSCHUNGSABT TECH SYST HAMBURG, D-22335 HAMBURG, GERMANY

来源：

APPLIED PHYSICS LETTERS | 1993年 / 63卷 / 19期

关键词：

D O I：

10.1063/1.110399

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have designed and fabricated a thin-film flux transformer by YBa2Cu3O7/SrTiO3 (YBCO/STO) multilayer process. The flux transformer consists of a 20-turn input coil of 10 mum linewidth and a single-turn pickup loop surrounding an area of 7.5 by 7.5 mm2. All device levels are patterned by standard photolithography and Ar-ion-beam etching. The flux transformer has been combined in flip-chip configuration with the square washer of a low-noise YBCO dc SQUID. The dc SQUID magnetometer exhibits a magnetic field sensitivity of 1.4 nT/PHI0. The intrinsic white flux noise level of 70muPHI0/ square-root Hz at 77 K is mainly dominated by the SQUID corresponding to a magnetic field resolution of the magnetometer of 100 fT/ square-root Hz for frequencies above 40 Hz. At 1 Hz we measured 200 fT/ square-root Hz. Biomagnetic measurements were performed in a magnetically shielded chamber.

引用

页码：2700 / 2702

页数：3

共 14 条

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