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6CCVD Research

Sensitivity Improvement via Differential Detection for Frequency-Locking Diamond Magnetometers

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2025-09-26
JournalMicromachines
AuthorsDoudou Zheng, Jian Gao, Yang Li, Hui Wang, Yingjie Yang
InstitutionsNorth University of China, Taiyuan Institute of Technology

Abstract

Section titled “Abstract”

The magnetic resonance frequency-locking technique is recognized as an effective approach for simultaneously improving the dynamic range, performance stability, and measurement precision of diamond nitrogen vacancy (NV)-center magnetometers. Nevertheless, insufficient research on sensitivity limits the overall performance of frequency-locking diamond magnetometers. In this paper, we propose a dual-magnetic-resonance-frequency-locking (MRFL) differential detection method. Theoretical and experimental results demonstrate that the scaling factor between the sensor output and the magnetic field is doubled compared with that under the single-MRFL method, and the proposed method also enables alternating current (AC) magnetic field detection. The proposed system exhibits a measurement range from −0.29 mT to 0.30 mT. Furthermore, a sensitivity of 0.56 nT/√Hz is achieved, representing a 58.2% improvement relative to that of the single-MRFL method. Our work provides a viable solution for accelerating the transition of frequency-locking diamond magnetometers from laboratory research to practical applications.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2023 - Nuclear quadrupole resonance spectroscopy with a femtotesla diamond magnetometer [Crossref]
  2. 2023 - Fiber-coupled diamond magnetometry with an unshielded sensitivity of 30 pT/Hz
  3. 2025 - Quantum magnetometry of transient signals with a time resolution of 1.1 nanoseconds [Crossref]
  4. 2024 - Detecting nitrogen-vacancy-hydrogen centers on the nanoscale using nitrogen-vacancy centers in diamond [Crossref]
  5. 2025 - Combined Confocal-Atomic-Force Microscope Setup for Quantum Sensing Applications with Sub-diffractional Spatial Resolution [Crossref]
  6. 2021 - Integrated and portable magnetometer based on nitrogen-vacancy ensembles in diamond [Crossref]
  7. 2025 - Fully integrated quantum magnetometer based on nitrogen-vacancy centers [Crossref]
  8. 2019 - A CMOS-integrated quantum sensor based on nitrogen-vacancy centres [Crossref]

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