A magnetometer using a refractory material integrated with a pickup coil and a DC superconducting quantum interference device (DC–SQUID) has been developed for biomagnetic applications. It has an overall size of 8 ×9 mm 2 and a field resolution of less than 40 fT/ √Hz which is limited by the electronics at frequencies above 20 Hz.
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Nakanishi et al. (1987) studied this question.
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