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Miniature Susceptometer Design

IP.com Disclosure Number: IPCOM000057235D
Original Publication Date: 1988-Apr-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Gallagher, WJ Ketchen, MB [+details]

Abstract

A technique is described whereby a miniature susceptometer is ideally suited for nuclear magnetic resonance (NMR) meaurements on individual small particles and provides the ability to measure magnetic susceptibility in higher fields. The concept is an improvement over previous designs in that it provides better SQUID-to-sample isolation. The miniature susceptometer (Minisup), as shown in Fig. 1, consists of a long narrow clip 10 (typically, 12 mm long), having on it floating ground planes 11 connected to field coil loops 12 and field coil input pads 13. At the opposite end are located the SQUID input coil 14 and the SQUID 15. An optical circuit, (Q-killer) 17, to dampen resonance from the excitation, may be installed as required. Susceptometer pickup loops 16 are located within field coil 12.