The JSQ standard magnetometer are YBa2Cu3O7 rf washer SQUIDs with step-edge junctions on single-crystal 5 mm × 5 mm × 1 mm LaAlO3 or SrTiO3 substrates. The operating temprature is 77 K.
The SQUIDs with 3.5 mm washer diameter are fabricated with a 100×100 um2 loops. The field-to-flux transformation coefficients is about 3.2 nT/Phi0 for the SQUID.
The magnetic field noise of the magnetormeter < 100 fT/root(Hz) for frequencies > 100 Hz with a resonance frequency of ~ 650 MHz.
The JSQ HTS rf SQUID Magnetometer Sensor is mounted in a capsule made of Vespel® with an outer diameter of 29 mm.