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A three-axis SQUID-based absolute vector magnetometer.

T Schönau1, V Zakosarenko2, M Schmelz1

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Summary
This summary is machine-generated.

This study introduces a mobile three-axis magnetometer using low critical temperature dc superconducting quantum interference devices (LTS dc SQUIDs). It achieves high sensitivity and stable operation in Earth's magnetic field without frequent recalibration.

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Area of Science:

  • Geophysics
  • Applied Physics
  • Instrumentation

Background:

  • Accurate measurement of Earth's magnetic field is crucial for various applications.
  • Existing magnetometers may lack the sensitivity, stability, or portability required for mobile geophysical surveys.
  • Superconducting Quantum Interference Devices (SQUIDs) offer high sensitivity but require careful implementation for practical field use.

Purpose of the Study:

  • To develop a robust, mobile three-axis absolute vector magnetometer for operation in Earth's magnetic field.
  • To enhance the long-term stability and reproducibility of SQUID-based magnetometer systems.
  • To demonstrate reliable field operation without the need for frequent recalibration.

Main Methods:

  • Utilized low critical temperature dc superconducting quantum interference devices (LTS dc SQUIDs) with sub-micrometer cross-type Josephson junctions.
  • Implemented superconducting strip lines with widths < 6 μm to prevent flux trapping during cool-down in unshielded environments.
  • Investigated and improved the long-term stability of flux-to-voltage transfer coefficients in SQUID electronics.

Main Results:

  • Achieved a white noise level of approximately 10 fT/Hz(1/2), indicating high sensitivity.
  • Developed a method to significantly enhance the reproducibility of flux-to-voltage transfer coefficients.
  • Demonstrated stable, long-term operation in a magnetic field with a 200 μT amplitude variation without recalibration.

Conclusions:

  • The developed LTS dc SQUID magnetometer is suitable for mobile operation in Earth's magnetic field.
  • The system exhibits high sensitivity and remarkable long-term stability and reproducibility.
  • This magnetometer offers a reliable solution for geophysical measurements requiring precise vector magnetic field data.