Integrated dc SQUID magnetometer with a high slew rate

Journal Article · Fri Jun 01 04:00:00 EDT 1984 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1137871· OSTI ID:6825897

Wellstood, F; Heiden, C; Clarke, J

We have fabricated a magnetometer in which the thin-film superconducting pick-up loop and dc SQUID are integrated on a single silicon chip. The magnetometer, which is intended primarily for geophysical applications, has a magnetic field sensitivity of typically 5 x 10/sup -15/ T Hz/sup -1//sup ///sup 2/ at frequencies above about 10 Hz, and 2 x 10/sup -14//( f /1 Hz)/sup 1//sup ///sup 2/ T Hz/sup -1//sup ///sup 2/ at lower frequencies. The dynamic range is +- 2 x 10/sup 7/ Hz/sup 1//sup ///sup 2/ and the maximum slew rate is about 4 x 10/sup -3/ T s/sup -1/ at 6 kHz. This high slew rate enables the magnetometer to be operated in a flux-locked loop for long periods of time without losing lock.

• Research Organization: Department of Physics, University of California, Berkeley, California 94720 and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Berkeley, California 94720
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6825897
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 55:6; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ELEMENTS
EQUIPMENT
FABRICATION
FLUXMETERS
INTEGRATED CIRCUITS
MAGNETIC FLUX
MAGNETOMETERS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MICROWAVE EQUIPMENT
SEMIMETALS
SENSITIVITY
SILICON
SQUID DEVICES
SUPERCONDUCTING DEVICES
USES