Highly sensitive magnetic sensor made with a superconducting Y-Ba-Cu-O thick film

In the research, Y-Ba-Cu-O (YBCO) thick film was fabricated to form a highly sensitive magnetic sensor, constructed to maintain the superconducting state at the boiling point of liquid nitrogen (77.4 K). Superconducting film will, in general, break the superconducting state of the flow of current at the value of current density J greater than that of the critical current density J_c, when the resistance R_sen to the flow of current occurs. The magnetic sensitivity increases as the value of the resistivity ρ_seu of R_sen decreases. The value of ρ_sen can be readily controlled by the value of J. The average sensitivity S of this magnetic sensor was determined as about 154%/gauss, over the magnetic range of 0 gauss to ±40 gauss. In addition,the sensitivity is about 154 times that of a giant magneto-resistance sensor. The paper examines the fabrication process and conditions, the characteristics of S as related to ρ_sen, and the magnetic response of the highly sensitive magnetic sensor