With low-noise magnetometers made from high-temperature superconductors, mobile applications of superconducting quantum interference device (SQUID) magnetometry become possible. Due to the high volume heat of evaporation of liquid nitrogen, a SQUID magnetometer can be operated in a small size cryostat for some hours. For the first time biomagnetic measurements are presented using an integrated YBa2Cu3O7 magnetometer mounted in a hand-held cryostat with a content of 100 cm3 of liquid nitrogen. These measurements and the noise properties are compared to those made in a conventional cryostat. The low-noise magnetometer consists of a multiloop pick-up coil coupled inductively to a dc SQUID based on ramp-type Josephson junctions with PrBa2Cu3O7 barriers.
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Schilling et al. (1996) studied this question.