High-performance UHF SQUID magnetometer.
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.
Long
A
A
School of Mathematical and Physical Sciences, University of Sussex, Brighton, BN1 9QH, United Kingdom.
Clark
T D
TD
Prance
R J
RJ
Richards
M G
MG