SQUID Magnetic Fluctuation Correlator
Original Publication Date: 1988-Feb-01
Included in the Prior Art Database: 2005-Feb-14
The correlation among magnetic fluctuations within a small region of a body at low temperature can be accurately measured by employing a plurality of superconducting quantum interference devices (SQUIDs) at varying distances from each other and selectively pairing the sensed responses. Referring to Figs. 1 and 2, six miniature SQUID magnetometers 1-6 have pick-up loops 7-12 that vary in diameter from 10 to 25 um and are spaced from each other 20-60 um center-to-center. Each loop is connected through a low inductance stripline to its respective SQUID that is read out individually with its own set of electronics. Samples, such as spin glass or a superconductor at its superconducting transition, that are large in relation to the dimensions of the area monitored by the pick-up loops are laid flat on the loops.