A miniature SQUID magnetometer with direct read-out electronics

Author

Polushkin, V. ; Wallis, M. ; Glowacka, D. ; Matthews, A. ; Lumley, J.M.

Author_Institution

Sci Res. Div., Oxford Instrum., Cambridge, UK

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1053

Lastpage

1056

Abstract

A novel miniature SQUID magnetometer with direct read-out electronics has been developed. A high flux-to-voltage transfer factor of up to 2500 mV//spl Phi//sub 0/ is achieved without additional positive feedback (/spl Phi//sub 0/ is the flux quantum). A flux resolution of 8/spl times/10/sup -7/ /spl Phi//sub 0//Hz/sup 1/2 /, corresponding to a magnetic moment sensitivity of approximately 2/spl times/10/sup -2/0 Am/sup 2//Hz/sup 1/2 / has been measured. This magnetometer can be used to study the dynamic magnetization properties (including NMR and MRI) of micron and sub-micron size particles and for high-resolution surface magnetometry.

Keywords

SQUID magnetometers; MRI; NMR; direct read-out electronics; dynamic magnetization; flux resolution; flux-to-voltage transfer factor; magnetic moment sensitivity; miniature SQUID magnetometer; sub-micron particles; surface magnetometry; Bandwidth; Energy resolution; Feedback loop; Magnetic flux; Magnetic noise; Magnetic semiconductors; Magnetic sensors; Preamplifiers; SQUID magnetometers; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.614702

Filename

614702