High-sensitivity magnetic field sensor

Details High-sensitivity magnetic field sensor High-sensitivity magnetic field sensor

2005-01-25

2005-01-25

Phung, Anh (Department: 2824)

Static information storage and retrieval

Systems using particular element

Superconductive

C365S173000

Reexamination Certificate

active

06847546

ABSTRACT:
There is provided a high sensitive magnetic field sensor which has a Josephson junction section (2) using a bismuth 2212 oxide high-temperature superconductor single-crystal (1) and is operated based on a periodical variation in a Josephson vortex flow resistance and in which the variation is caused by an electric current which is passed vertical to a Josephson junction surface and, at the same time, a magnetic field which is applied approximately parallel to the Josephson junction surface. The sensor detects a corresponding magnetic field, using a curve which represents a relation between a Josephson vortex flow resistance and a magnetic field and has been obtained beforehand by measurements, and a resistance value which is measured in a state in which an electric current is passed, and can observe a little change of magnetic field in a high magnetic field area.

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K. Hirata et al., “Josephson Vortices in Bi2Sr2CaCu2O8+5single crystal”, Physica C, Oct. 15, 2002, vol. 382. No. 1, pp. 142-146.

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