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.
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Long et al. (1979) studied this question.
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