Application of a Bulk High-Critical Temperature Superconductor using a Shock Compaction Method to Fabricate the Magnetic Sensor

Abstract

Bulk BPSCCO (Bi-Pb-Sr-Ca-Cu-O) as a magnetic sensor was fabricated by use of the shock compaction technique, and then annealed under a temperature of 845 °C for 48 hours in an electronic furnace. The magnetic sensitivity S of the specimen was about 13 %/(10-4 T) over the range of measurement of the magnetic field Bmeas from 0 to ±5×10-4 T, under a constant 40×10-4 T of the Bbias values. This was approximately 13 times greater than that of GMR (giant magnetoresistance) sensor. It was determined it was possible to apply the bulk BPSCCO specimen as a highly sensitive magnetic sensor. The present paper demonstrates the dependence of resistance R(T), without the application of a Bbias, for the specimen on temperature, the dependence of resistivity ρ on the current density J, the dependence of the magnetic sensitivity S on ρ, and the dependence of the Rmeas on Bmeas. In addition, the present paper compares the characteristics of magnetic sensors constructed with and without the shock compaction method and discusses the results.