Title :
Fundamental characteristics of a magnetoresistive sensor using Y 1Ba2Cu3O7-x ceramic superconducting films
Author :
Nojima, Hideo ; Shintaku, Hidetaka ; Nagata, Masaya ; Kataoka, Shoei
Author_Institution :
Sharp Corp., Nara, Japan
fDate :
3/1/1992 12:00:00 AM
Abstract :
The fundamental characteristics of a magnetic sensor fabricated from a Y1Ba2Cu3O7-x ceramic superconducting film are investigated. The operation principle of the sensor is based on the magnetoresistive properties of the material. The Y1Ba2Cu3O7-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 2×10-6 G/(Hz) 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
Keywords :
barium compounds; ceramics; high-temperature superconductors; magnetoresistance; superconducting devices; superconducting thin films; yttrium compounds; 0.1 to 100 G; 100 Hz; AC modulation; YBa2Cu3O7-x; ceramic superconducting films; characteristics; high temperature superconductors; lock-in amplifier; magnetic field resolution; magnetic sensor; magnetoresistive sensor; meander shape; noise measurement; operation; phase detection; sensitivity; spray pyrolysis method; Ceramics; Magnetic fields; Magnetic films; Magnetic materials; Magnetic properties; Magnetic sensors; Magnetoresistance; Sensor phenomena and characterization; Superconducting films; Superconducting materials;
Journal_Title :
Electron Devices, IEEE Transactions on
