LOW-NOISE YBA2CU3O7 RF SQUID MAGNETOMETER

被引：65

作者：

ZHANG, Y

MUCK, HM

HERRMANN, K

SCHUBERT, J

ZANDER, W

BRAGINSKI, AI

HEIDEN, C

机构：

[1] Institut für Schicht und Ionentechnik (ISI), Forschungszentrum Jülich (KFA), D-W5170 Jülich

来源：

APPLIED PHYSICS LETTERS | 1992年 / 60卷 / 05期

关键词：

D O I：

10.1063/1.106580

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A superconducting quantum interferometer device (SQUID) electronics with tank frequencies near 150 MHz was constructed to enhance the rf SQUID sensitivity. By these means we characterized our YBa2Cu3O7 thin-film rf SQUIDs with step-edge junctions immersed in liquid N2. We obtained transfer function values of over 40-mu-V/PHI(0), at a 50-OMEGA input impedance, for both hysteretic and dispersive mode of rf SQUID operation. The rms white and 1/f flux noise levels were significantly lower than at the tank frequency of 20 MHz. The best magnetic field sensitivity at 77 K was 0.9 pT/Hz1/2, and the energy resolution 1.4 x 10(-28) J/Hz, down to 0.3 Hz.

引用

页码：645 / 647

页数：3

共 14 条

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