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2007•Journal of Applied PhysicsRequires access

Characteristics of integrated high-Tc superconducting quantum interference device magnetometer and gradiometer with serial array

Hong-Chang Yang, Chiu‐Hsien Wu, Jung-Chieh Chen, K. L. Chen, H. E. Horng, Yi-Shou Tsai, Shieh‐Yueh Yang

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Abstract

We characterized the current-voltage, voltage-flux, and the field sensitivity of integrated high-Tc series superconducting quantum interference device (SQUID) magnetometers and gradiometers. The series two-SQUID magnetometers shows field sensitivities of ∼30–40fT∕Hz1∕2 at 1kHz and ∼80–100fT∕Hz1∕2 at 1Hz over that of a one-SQUID magnetometer in shielded environment. The field sensitivity of a series two-SQUID gradiometers is ∼60fT∕Hz1∕2cm, while the one-SQUID gradiometer shows a gradient sensitivity of ∼80–150fT∕Hz1∕2cm at 1kHz in an unshielded laboratory environment. The series two-SQUID magnetometers or gradiometers show a significant improvement in flux noises over that of one-SQUID magnetometers or gradiometers.

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What this paper is about

We characterized the current-voltage, voltage-flux, and the field sensitivity of integrated high-Tc series superconducting quantum interference device (SQUID) magnetometers and gradiometers. The series two-SQUID magnetometers shows field sensitivities of ∼30–40fT∕Hz1∕2 at 1kHz and ∼80–100fT∕Hz1∕2 at 1Hz over that of a one-SQUID magnetometer in shielded environment. The field sensitivity of a series two-SQUID gradiometers is ∼60fT∕Hz1∕2cm, while the one-SQUID gradiometer shows a gradient sensitivity of ∼80–150fT∕Hz1∕2cm at 1kHz in an unshielded laboratory environment. The series two-SQUID magnetometers or gradiometers show a significant improvement in flux noises over that of one-SQUID magnetometers or gradiometers.

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Available abstract

We characterized the current-voltage, voltage-flux, and the field sensitivity of integrated high-Tc series superconducting quantum interference device (SQUID) magnetometers and gradiometers. The series two-SQUID magnetometers shows field sensitivities of ∼30–40fT∕Hz1∕2 at 1kHz and ∼80–100fT∕Hz1∕2 at 1Hz over that of a one-SQUID magnetometer in shielded environment. The field sensitivity of a series two-SQUID gradiometers is ∼60fT∕Hz1∕2cm, while the one-SQUID gradiometer shows a gradient sensitivity of ∼80–150fT∕Hz1∕2cm at 1kHz in an unshielded laboratory environment. The series two-SQUID magnetometers or gradiometers show a significant improvement in flux noises over that of one-SQUID magnetometers or gradiometers.

Key concepts: Gradiometer, Magnetometer, Squid, Scanning SQUID microscopy, Superconductivity, Physics, Sensitivity (control systems), Shielded cable

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