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Fundamental characteristics of a magnetoresistive sensor using Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ ceramic superconducting films

1992; Institute of Electrical and Electronics Engineers; Volume: 39; Issue: 3 Linguagem: Inglês

10.1109/16.123480

1557-9646

Hideo Nojima, H. Shintaku, M. Nagata, S. Kataoka,

Magnetic and transport properties of perovskites and related materials

The fundamental characteristics of a magnetic sensor fabricated from a Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ ceramic superconducting film are investigated. The operation principle of the sensor is based on the magnetoresistive properties of the material. The Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7-x/ ceramic film was prepared by the spray pyrolysis method. An element of the magnetic sensor consists of the film patterned to a meander shape. the sensitivity is discussed in connection with the noise measurement of the element. A magnetic field resolution of 2*10/sup -6/ G/(Hz)/sup 1/2/ at 100 Hz was obtained in the 0.1-100 G range. The sensitivity is much higher than that of a conventional semiconductor magnetic sensor. With an AC modulation provided by a magnetic field, phase detection of the magnetic field can be performed using a lock-in amplifier. An improvement in the low-frequency (<1 Hz) magnetic field resolution of about one order of magnitude was obtained using this method. >