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A dual-function superconducting shield for SQUID (superconducting quantum interference device) gradiometers.

Guangxin Han1, Kaiyuan Song1, Yuntao Qiu1

  • 1National Gravitation Laboratory, MOE Key Laboratory of Fundamental Physical Quantities Measurement, and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.

The Review of Scientific Instruments
|February 13, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel dual-function superconducting shield to protect Superconducting Quantum Interference Devices (SQUIDs) from magnetic interference and improve stability. This practical solution enhances the reliability of SQUID gradiometers in various applications.

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Area of Science:

  • Applied Physics
  • Superconducting Devices
  • Magnetometry

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are sensitive magnetometers susceptible to external magnetic fields.
  • Pickup-coil imbalance in SQUID gradiometers can affect measurement accuracy and stability.
  • Existing shielding methods often lack adaptability for dynamic compensation.

Purpose of the Study:

  • To design and validate a novel dual-function superconducting shield for SQUID protection.
  • To enable compensation of pickup-coil imbalance through adjustable axial displacement.
  • To enhance the stability and reliability of SQUID gradiometers for practical applications.

Main Methods:

  • Design and fabrication of a dual-function superconducting shield.
  • Integration with a prototype low-temperature SQUID gradiometer (150 mm baseline, 105 mm² coil area).
  • Experimental validation including intrinsic noise measurements and dynamic tests on a moving platform.

Main Results:

  • Achieved intrinsic noise levels of approximately 50 fT/m/√Hz at 0.1-1 Hz.
  • Demonstrated stable operation under strong magnetic disturbances during dynamic tests.
  • Validated the effectiveness of the dual-function shield in protecting SQUIDs and compensating for coil imbalance.

Conclusions:

  • The novel dual-function superconducting shield effectively protects SQUIDs from magnetic interference.
  • Adjustable axial displacement allows for precise compensation of pickup-coil imbalance.
  • This technology offers a practical enhancement for wire-wound SQUID gradiometers, improving their stability and reliability.