G - Physics – 01 – R
Patent
G - Physics
01
R
324/55
G01R 33/16 (2006.01) G01R 33/035 (2006.01)
Patent
CA 1222023
MINIATURE SQUID SUSCEPTOMETER ABSTRACT A miniature, fully integrated susceptometer capable of measuring the magnetic properties of very small samples (< 10µm) is described which is fabricated by thin film lithography on a single chip. The susceptometer is comprised of a dc SQUID including two series wired pick-up loops into which a sample to be measured can be placed. A field coil is provided which includes a separate single turn around each of the SQUID pick-up loops. The SQUID pick-up loops and the surrounding field coil turns are both located over a hole in a superconducting groundplane. The SQUID pick-up loops are connected by wide, low inductance transmission lines to remotely located Josephson tunnel junctions. The signal to be detected is generated locally within one of the SQUID pick-up loops to provide direct coupling of the sample to be measured to the SQUID pick-up loop. The SQUID tunnel junctions are remotely located from the pick-up loops and are located over a superconducting groundplane. A resistive balance circuit is provided, as is readout electronics for detecting the state of the SQUID.
464505
International Business Machines Corporation
Rosen Arnold
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