Even harmonic Josephson magnetometry

Author

Geng, Q. ; Goto, E.

Author_Institution

Inst. of Phys. & Chem. Res., Saitama, Japan

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1812

Lastpage

1815

Abstract

A novel Josephson junction magnetometry scheme is proposed in which magnetic flux is applied to Josephson junctions with a modulation flux +or-z( Phi /sub 0//2 pi ) cos omega t. Two Josephson junctions are used in a push-pull mode to perform amplification through two mechanisms: negative inductance amplification of DC (low frequency) components and parametric amplification of the second harmonic. The second harmonic component of the Josephson currents, which is directly proportional to the strength of the input flux, is then selected and amplified by a phase-sensitive detector. Computer simulations show that the device behaves very well as a magnetic flux sensor with a DC offset free feature. The device´s parameters and noise problems are also discussed. A preliminary analysis indicates that it is likely to have a better sensitivity than superconducting quantum interference devices.<>

Keywords

electron device noise; harmonic generation; magnetic field measurement; magnetic flux; magnetometers; microwave parametric amplifiers; superconducting junction devices; DC offset free characteristics; Josephson junction magnetometry scheme; magnetic flux; magnetic flux sensor; modulation flux; negative inductance amplification; noise problems; parametric amplification; phase-sensitive detector; push-pull mode; second harmonic component; sensitivity; Detectors; Frequency; Inductance; Josephson effect; Josephson junctions; Magnetic flux; Magnetic modulators; Phase detection; Superconducting device noise; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233330

Filename

233330