Superconductive magneto resistive apparatus for measuring weak m

Details Superconductive magneto resistive apparatus for measuring weak m Superconductive magneto resistive apparatus for measuring weak m

1989-07-03

1991-10-08

Wieder, Kenneth A.

Electricity: measuring and testing

Magnetic

Magnetometers

324252, 505701, 505845, G01R 33035, G01R 3306

Patent

active

050557858

ABSTRACT:
A ceramic superconductive magneto-resistive element which has weak grain boundaries is highly sensitive to weak magnetic fields. The magnetic field is measured by the use of an electronic circuit. A comparator is used for comparing an output and reference voltage of the element. When there is a difference between the output and reference voltage bias current is used to equalize these voltages.

REFERENCES:
patent: 4052748 (1977-10-01), Kuijk
patent: 4142218 (1979-02-01), Gorter
patent: 4535375 (1985-08-01), Mowry et al.
patent: 4566050 (1986-01-01), Beam et al.
patent: 4875010 (1989-10-01), Yokosawa et al.
Novel Magnetic Sensor Using Y--Ba--Cu--O Ceramic Superconductor: Super Magneto-Resistor--Shuhei Tsuchimoto, Shoei Kataoka, Hideo Nojima Ryusuke Kita, Masaya Nagata and Hidetaka Shintaku--International Electron Devices Meeting, Washington, DC, Dec. 6-9, 1987.
"Superconductive Electronics" ISBN 4-274-03095-4, Printed in Japan, pp. 47-87, 12/1985.
Nojima et al., "Galvanomagnetic Effect of an Y--Ba--Cu--O Ceramic Superconductor and Its Application to Magnetic Sensors", Japanese Journal of Applied Physics, vol. 27, No. 5, May 1988, pp. 746-750.

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