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Thermal strains and eddy currents impose a fundamental limit to the minimum detectable field capability of metallic glass based fibre-optic DC magnetometers. A room-temperature magnetometer operating with a resonance Q of 100 exhibits a theoretical minimum detectable field of ∼3×10−11 Oe in the DC to 1 Hz bandwidth.
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Marc D. Mermelstein (1985) studied this question.
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