The Impact of High-Temperature Superconductivity on SQUID Magnetometers

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Science  14 Oct 1988:
Vol. 242, Issue 4876, pp. 217-223
DOI: 10.1126/science.242.4876.217


DC and RF Superconducting QUantum Interference Devices (SQUIDs) fabricated from low transition temperature (Tc) superconductors and operated at liquid 4He temperatures are routinely used as ultrasensitive detectors in many applications, for example, as magnetometers, magnetic gradiometers, voltmeters, and motion detectors. SQUIDs fabricated from high Tc superconductors such as YBa2Cu3O7 and operated in liquid nitrogen at 77 K offer a greater convenience in operation at the expense of a poorer noise performance, particularly at low frequencies. The resolution of SQUID-based magnetometers is compared with that of other types of magnetometers operatng at ambient temperatures.