Thin-film based ultralow noise SQUID magnetometer

摘要

We report on the development of an ultralow noise thin-film based SQUIDmagnetometer. A niobium thin-film pickup coil is connected to the input coil ofa SQUID current sensor. The low capacitance of the used sub-micrometercross-type Josephson junctions enable superior noise performance of the device.Application scenarios e.g. in geophysics and ultra-low field magnetic resonanceimaging are discussed.