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Superconductive quantum interference magnetometer with high sensitivity achieved by an induced resonance.

A Vettoliere1, C Granata1

  • 1Istituto di Cibernetica "E. Caianiello" del Consiglio Nazionale delle Ricerche, I-80078 Pozzuoli, Napoli, Italy.

The Review of Scientific Instruments
|September 1, 2014
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Summary

This study presents a low-noise superconducting quantum interference device (SQUID) magnetometer with high voltage responsivity. The novel design achieves a magnetic field noise level of 3 fT/Hz(1/2), suitable for biomagnetism applications.

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Area of Science:

  • Superconducting quantum devices
  • Magnetometry
  • Low-noise electronics

Background:

  • Superconducting Quantum Interference Devices (SQUIDs) are sensitive magnetic flux detectors.
  • Achieving high voltage responsivity and low magnetic noise is crucial for advanced applications.
  • Existing SQUID magnetometers face limitations in sensitivity and operational characteristics.

Purpose of the Study:

  • To develop a fully integrated, low-noise SQUID magnetometer with enhanced voltage responsivity.
  • To investigate the effect of an integrated superconducting coil on SQUID performance.
  • To evaluate the suitability of the developed magnetometer for practical applications.

Main Methods:

  • Fabrication of a fully integrated SQUID magnetometer.
  • Introduction of resonance via an integrated superconducting coil to enhance voltage responsivity.
  • Measurement of voltage-magnetic flux characteristics, magnetic field noise spectral density, bandwidth, and slew rate.

Main Results:

  • Achieved intrinsic voltage responsivity as high as 500 μV/Φ0.
  • Demonstrated a spectral density of magnetic field noise as low as 3 fT/Hz(1/2).
  • Characterized bandwidth and slew rate, comparing with and without resonance and positive feedback.

Conclusions:

  • The integrated resonance technique significantly enhances SQUID voltage responsivity.
  • The developed SQUID magnetometer exhibits excellent low-noise characteristics.
  • The device's performance makes it suitable for various applications, including biomagnetism.