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Updated: Jun 25, 2025

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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High-Dynamic-Range Integrated NV Magnetometers.

Tianning Wang1,2, Zhenhua Liu1,2, Yankang Liu1,3

  • 1State Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China.

Micromachines
|May 25, 2024
PubMed
Summary

This study introduces a novel frequency-tracking scheme for Diamond Nitrogen Vacancy (NV) magnetometers. The technique significantly enhances the dynamic range for precise, real-time magnetic field measurements.

Keywords:
diamond NV centershigh dynamic rangeintegrated magnetometermagnetic field measurement

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Area of Science:

  • Quantum sensing
  • Solid-state physics
  • Nanoscale magnetometry

Background:

  • Diamond Nitrogen Vacancy (NV) color center magnetometers offer high spatial resolution and sensitivity for magnetic field measurements.
  • Existing NV magnetometers have limitations in dynamic range, restricting their application in rapidly changing magnetic fields.

Purpose of the Study:

  • To develop an innovative frequency-tracking scheme for NV magnetometers.
  • To expand the dynamic range and improve the detection rate of rapidly changing magnetic fields using NV centers.

Main Methods:

  • Proposed a frequency-tracking scheme that continuously monitors resonant frequency shifts of the NV color center.
  • Implemented feedback to the microwave source based on monitored frequency shifts.
  • Utilized the NV center's characteristics for magnetic field sensing.

Main Results:

  • Successfully expanded the magnetometer's dynamic range to 6.4 mT, a 34-fold increase over the intrinsic range.
  • Achieved efficient detection of rapidly changing magnetic field signals at a rate of 0.038 T/s.
  • Demonstrated enhanced performance for time-varying magnetic field measurements.

Conclusions:

  • The proposed frequency-tracking scheme significantly enhances the dynamic range of NV magnetometers.
  • This advancement enables precise measurement of complex and rapidly changing magnetic fields.
  • The technology holds potential for applications requiring high-performance magnetometry.