A linearized Josephson-Fraunhofer magnetometer with high-temperature Josephson junction

被引：5
|
作者：
Dolabdjian, C [1 ]
Poupard, P [1 ]
Martin, V [1 ]
Gunther, C [1 ]
Hamet, JF [1 ]
Robbes, D [1 ]
机构：
[1] UNIV CAEN,F-14050 CAEN,FRANCE
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 1996年 / 67卷 / 12期
关键词：
D O I：
10.1063/1.1147564
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
We have fabricated a Josephson-Fraunhofer magnetometer based on the shrinking of the Fraunhofer pattern exhibited by high-T-c grain boundaries Josephson (GBJ) junctions. It is obtained using flux focuser and GBJ junction directly patterned on a single chip. The device is actively voltage biased and operates in a field locked loop as conventional superconducting quantum interference device systems. The amplitude of the auxiliary modulation field is adjusted to obtain the maximal sensitivity; the coupling between the feedback coil and the flux focuser has been studied to evaluate the magnetometer performances. The system bandwidth is 1 kHz and the measured noise level is 40 pT/root Hz above 10 Hz. The slew rate and the dynamic range of the magnetometer are 2 mT/s and 112 dB (1 Hz bandwidth), respectively. (C) 1996 American Institute of Physics.
引用
收藏
页码：4171 / 4175
页数：5
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