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Highly Sensitive Magnetic Sensor Fabricated from Bulk Superconductor: Influence of Sensor Thickness on Magnetic Sensitivity

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In the present research, a bulk Bi-Pb-Sr-Ca-Cu-O (BPSCCO) superconductor was employed to construct a highly sensitive magnetic sensor by use of the shock compaction method, developing a new fabrication technique for a bulk high-critical temperature superconductor. Values of the thickness t of the sensor when fabricating under a shock compaction pressure P of 1 GPa were systematically changed between 0.2 and 1.1 mm in order to investigate the magnetic sensitivity S of the sensor. It was found that the magnetic sensitivity S increased as the sensor thickness t decreased. In the present experiment, the magnetic sensitivity reached maximum value for a sensor thickness t of 0.2 mm, being approximately 225%/(10−4 T), and about 225 times that of a giant magneto-resistance sensor. The voltage fluctuation of a bulk BPSCCO sensor, when changing sensor thickness t, under a constant current density J, was previously unknown. In order to examine this, systematic measurements were taken of the voltage noise power spectrum of the sensor. Results from the present study revealed important criteria for the design of a highly reliable and sensitive magnetic sensor.
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Document Type: Research Article

Publication date: 2009-06-01

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