Ensemble diamond nitrogen-vacancy (DNV) centers have emerged as a promising platform for precise earth-field vector magnetic sensing, particularly in applications that require high mobility. Nevertheless, integrating all control utilities into a compact form has proven challenging, thus far limiting the sensitivity of mobile DNV magnetometers to the uT-level. This study introduces a fully integrated DNV magnetometer that encompasses all the essential components typically found in traditional platforms, while maintaining compact dimensions of approximately 13 cm * 26 cm. In contrast to previous efforts, we successfully address these challenges by integrating a high-power laser, a lock-in amplifier, and a digitally-modulated microwave source. These home-made components show comparable performance with commercial devices under our circumstance, resulting in an optimal sensitivity of 2.14 nT/sqrt{Hz}. The limitations in this system as well as possible future improvements are discussed. This work paves the way for the use of DNV magnetometry in cost-effective, mobile unmanned aerial vehicles, facilitating a wide range of practical applications.
@article{arxiv.2508.03237,
title = {A Fully-integrated Diamond Nitrogen-Vacancy Magnetometer with Nanotesla Sensitivity},
author = {Yulin Dai and Wenhui Tian and Qing liu and Bao Chen and Yushan Liu and Qidi Hu and Zheng Ma and Yunpeng Zhai and Haodong Wang and Ying Dong and Nanyang Xu},
journal= {arXiv preprint arXiv:2508.03237},
year = {2025}
}