Electricity: measuring and testing – Magnetic – Susceptibility
Patent
1983-12-30
1986-05-13
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Susceptibility
307306, 324248, 357 5, G01R 3316, G01R 33035
Patent
active
045889473
ABSTRACT:
A miniature, fully integrated susceptometer capable of measuring the magnetic properties of very small samples (<10 .mu.m) 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.
REFERENCES:
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International Business Machines - Corporation
Stanland Jackson E.
Strecker Gerard R.
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