Abstract
High-TC SQUID sensors having 0.4 pT/√Hz at 1 Hz noise at liquid nitrogen temperature are already superior to fluxgate sensors (2.5 pT/√Hz at 1 Hz, 50 pT p-p). Ac-flipped permalloy magnetoresistors have offset of 10 NT and 15 nT p-p noise. The noise properties of semiconductor, induction and other types of magnetic field sensors are discussed.
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