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We demonstrate the use of a hybrid $^{3}$He / $^{87}$Rb magnetometer tomeasure absolute magnetic fields in the pT range. The measurements wereundertaken by probing time-dependent $^3$He magnetisation using $^{87}$Rbzero-field magnetometers. Measurements were taken to demonstrate the use of themagnetometer in cancelling residual fields within a magnetic shield. It wasshown that the absolute field could be reduced to the 10 pT level by usingfield readings from the magnetometer. Furthermore, the hybrid magnetometer wasshown to be applicable for the reduction of gradient fields by optimising theeffective $^3$He $T_2$ time. This procedure represents a convenient andconsistent way to provide a near zero magnetic field environment which can bepotentially used as a base for generating desired magnetic field configurationsfor use in precision measurements.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

PicoTesla absolute field readings with a hybrid 3He/87Rb magnetometer