We present two fiberized vector magnetic-field sensors, based on nitrogen-vacancy (NV) centers in diamond. The sensors feature sub-nT/Hz magnetic sensitivity. We use commercially available components to construct sensors with a small sensor size, high photon collection, and minimal sensor-sample distance. Both sensors are located at the end of optical fibres with the sensor-head freely accessible and robust under movement. These features make them ideal for mapping magnetic fields with high sensitivity and spatial resolution (≤\,mm). As a demonstration we use one of the sensors to map the vector magnetic field inside the bore of a ≥ 100\,mT Halbach array. The vector field sensing protocol translates microwave spectroscopy data addressing all diamonds axes and including double quantum transitions to a 3D magnetic field vector.
@article{arxiv.2102.11902,
title = {Fiberized diamond-based vector magnetometers},
author = {Georgios Chatzidrosos and Joseph Shaji Rebeirro and Huijie Zheng and Muhib Omar and Andreas Brenneis and Felix M. Stürner and Tino Fuchs and Thomas Buck and Robert Rölver and Tim Schneemann and Peter Blümler and Dmitry Budker and Arne Wickenbrock},
journal= {arXiv preprint arXiv:2102.11902},
year = {2021}
}