Integrated Thin-Film Miniature SQUID Magnetometer
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
A typical SQUID (Superconducting Quantum Interference Device) magnetometer circuit uses a SQUID with its input coil connected to a pickup coil by a twisted pair of superconducting wires. The SQUID itself is typically housed in a superconducting shield to screen it from ambient magnetic fields and to minimize the effects of fields associated with operating the SQUID on the field distribution to be measured. Planar thin-film SQUIDs of low self-inductance can be used with wire-wound magnetometer pickup loops to give improved sensitivity. However, for certain applications, such as studying flux trapping phenomena in a superconducting groundplane, a sensitive magnetometer with an extremely small pickup loop is required.