title: High-performance UHF SQUID magnetometer.
abstract: We describe a lumped-component stabilized point contact SQUID magnetometer, biased at 430 MHz and utilizing a cooled (4.2 K) GaAs FET preamplifier. The system incorporateds a full-bandwidth (5-10 MHz) flux-locked loop and has an overall flux sensitivity of 1x10(-5) Phi0/(Hz)(1/2), corresponding to an energy sensitivity approximately 4.5x10(-31) J/Hz.
authors.affiliation: School of Mathematical and Physical Sciences, University of Sussex, Brighton, BN1 9QH, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Long
authors.forename: T D
authors.initials: TD
authors.lastname: Clark
authors.forename: R J
authors.initials: RJ
authors.lastname: Prance
authors.forename: M G
authors.initials: MG
authors.lastname: Richards