Characteristics of a Bulk BPSCCO Magnetic Sensor Constructed by the Shock Compaction Method: Effect of the Shock Compaction Pressure on Magnetic Sensitivity

• Published in: IEEE transactions on applied superconductivity Vol. 18; no. 2; pp. 1573 - 1576
• Main Authors: Fujita, H., Miwa, T., Itoh, M., Kezuka, H., Matsumoto, H., Kishimura, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.06.2008; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bulk BPSCCO; Compaction; Electric shock; Electrical engineering. Electrical power engineering; Electromagnets; Electronics; Exact sciences and technology; Fabrication; General equipment and techniques; Giant magnetoresistance; High temperature superconductors; highly sensitivity; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic devices; magnetic sensor; Magnetic sensors; Magnetoelectric, magnetostrictive, magnetoacoustic, magnetooptic and magnetothermal devices. Spintronics; Physics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Sensor systems; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Superconducting magnets; Temperature sensors; the shock compaction method; Various equipment and components; Voltage fluctuations; Magnetoresistive device; Bulk BPSCCO; Measurement sensor; magnetic sensor; Power system stability; Giant magnetoresistance; Compaction; Noise spectrum; Sensitivity; Magnetic sensors; highly sensitivity; Voltage stability; the shock compaction method; Voltage fluctuation; Current density; High temperature superconductor; Power spectrum
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2008.920543

Recently, there has been an increased need for the development of a highly sensitive magnetic sensor for gathering new magnetic information. As one of the basic areas of research for the development of a highly sensitive magnetic sensor, the present authors have constructed a bulk Bi-Pb-Sr-Ca-Cu-O (BPSCCO) magnetic sensor by the shock compaction method as a new fabrication technique of the bulk high-critical temperature superconductor (HTS). Values of the shock compaction pressure are systematically changed between 1 and 9 GPa to investigate the magnetic sensitivity of the sensor. It was found that the value of was related to the value of . The magnetic sensitivity reached optimum values when maintaining a pressure of 1 GPa, being approximately , and about 11 times that of a giant magnetoresistance (GMR) sensor. The voltage fluctuation of a bulk BPSCCO sensor, when changing the value of , under a constant current density , was previously unknown. To help clarify this, systematic measurements were taken of the voltage noise power (VNP) spectrum of the sensor. The results lead to an important criterion for use in the design of a highly reliable and sensitive magnetic sensor.