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Sensitivity Improvement via Differential Detection for Frequency-Locking Diamond Magnetometers.

Doudou Zheng1,2,3, Jian Gao2,3, Yang Li2,3

  • 1Department of Electronic Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China.

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This summary is machine-generated.

This study introduces a dual-magnetic resonance frequency-locking (MRFL) method for diamond nitrogen vacancy (NV)-center magnetometers. The new technique doubles sensitivity and improves AC magnetic field detection for practical applications.

Keywords:
NV centerdifferential detectionfrequency lockingsensitivity

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Area of Science:

  • Quantum Sensing
  • Materials Science
  • Metrology

Background:

  • Diamond nitrogen vacancy (NV)-center magnetometers offer high precision.
  • Magnetic resonance frequency-locking (MRFL) enhances dynamic range, stability, and precision.
  • Current MRFL methods face sensitivity limitations hindering practical use.

Purpose of the Study:

  • To address sensitivity limitations in frequency-locking diamond magnetometers.
  • To propose and validate a novel dual-MRFL differential detection method.
  • To enable enhanced AC magnetic field detection capabilities.

Main Methods:

  • Development of a dual-magnetic-resonance-frequency-locking (MRFL) differential detection system.
  • Theoretical modeling and experimental validation of the proposed method.
  • Characterization of measurement range and sensitivity.

Main Results:

  • The dual-MRFL method doubles the scaling factor compared to single-MRFL.
  • Achieved a measurement range of -0.29 mT to 0.30 mT.
  • Demonstrated a sensitivity of 0.56 nT/√Hz, a 58.2% improvement over single-MRFL.

Conclusions:

  • The dual-MRFL technique significantly enhances diamond magnetometer sensitivity and performance.
  • The method supports AC magnetic field detection, broadening application scope.
  • This work facilitates the transition of MRFL diamond magnetometers to practical applications.