Title :
Design and performance of a highly sensitive magnetoresistive sensor using high Tc YBa/sub 2/Cu/sub 3/O/sub 7-x/ ceramic superconducting film
Author :
Nojima, H. ; Takao, K. ; Yamashita, T. ; Fujimoto, Mitoshi ; Nagata, M. ; Koba, M. ; Kataoka, S.
Author_Institution :
Functional Devices Labs., Sharp Corp., Chiba, Japan
Abstract :
This paper reports on the design and development of a magnetoresistive sensor using a high Tc ceramic superconducting film. We have fabricated a meander-shape element by the selective growth of an electrophoretic Ag/sub 2/O-doped YBa/sub 2/Cu/sub 3/O/sub 7-x/ film. The doping amount of Ag/sub 2/O has been optimized to improve the magnetic field sensitivity and the element has been coupled to a Permalloy to enhance the sensitivity. A magnetic field resolution of 8.5 pT Hz/sup -1/2/ at 100 Hz at 77 K has been obtained with no input coil. To demonstrate this high sensitivity, we have been successful in measuring a human magnetocardiogram.<>
Keywords :
barium compounds; electric sensing devices; high-temperature superconductors; magnetic field measurement; magnetoresistive devices; superconducting devices; superconducting thin films; yttrium compounds; 77 K; HTSC film; Permalloy; YBCO film; YBa/sub 2/Cu/sub 3/O/sub 7/:Ag/sub 2/O; ceramic superconducting film; electrophoretic Ag/sub 2/O-doped film; high Tc film; magnetic field sensitivity; magnetoresistive sensor; meander-shape element; selective growth; Barium compounds; Detectors; High-temperature superconductors; Magnetic field measurement; Magnetoresistive devices; Superconducting devices; Superconducting films; Yttrium compounds;
Conference_Titel :
Electron Devices Meeting, 1992. IEDM '92. Technical Digest., International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0817-4
DOI :
10.1109/IEDM.1992.307523
