DC SQUID preamplifier for DC-SQUID magnetometer

Author

Koshelets, V.P. ; Matlashov, A.N. ; Serpuchenko, I.L. ; Filippenko, L.V. ; Zhuravlev, Y.E.

Author_Institution

Inst. of Radio Eng. & Electron., Moscow, USSR

Volume

25

Issue

2

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

1182

Lastpage

1185

Abstract

A DC SQUID (superconducting quantum interference device) magnetometer with DC SQUID preamplifier has been designed and experimentally tested. The total magnetometer noise was reduced to the intrinsic noise level of the input DC SQUID, and magnetometer cryogenic containment was minimized by using the DC SQUID preamplifier. Two identical thin-film DC SQUIDs with 15-μm²-area resistively shunted Nb-AlO_x-Nb junctions were utilized. The resulting magnetometer had a coupled energy sensitivity ≅3×10^-31 J/Hz in the range from 1 Hz to 30 kHz and about 100-dB dynamic range

Keywords

SQUIDs; aluminium compounds; electron device noise; magnetometers; niobium; 1 Hz to 30 kHz; DC SQUID preamplifier; DC-SQUID magnetometer; Nb-AlO_x-Nb; coupled energy sensitivity; intrinsic noise level; magnetometer cryogenic containment; total magnetometer noise; Cryogenics; Interference; Noise level; Noise reduction; Preamplifiers; SQUID magnetometers; Superconducting device noise; Superconducting devices; Superconducting thin films; Testing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92501

Filename

92501