This work investigates the behavior of a spin-exchange relaxation-free (SERF) magnetometer integrated into the feedback branch of a closed-loop control circuit, designed to actively suppress noise from a current source. In this configuration, the magnetometer bandwidth is enhanced by almost two orders of magnitude as compared to the open-loop setup. Incorporating an injection transformer, the proposed system effectively reduces current noise to below 3 nA/sqrt(Hz) over a broad frequency bandwidth, independent of DC-current offsets. Analysis of the system sensitivity reveals that the performance is currently limited by technical noise. If this were to be eliminated, the system would achieve a current sensing sensitivity on the order of few pA/sqrt(Hz), while maintaining perfect galvanic isolation from the target circuit.
@article{arxiv.2506.11923,
title = {Bandwidth enhanced current noise suppression with a SERF magnetometer},
author = {Tobias Menold and Arianna Bertoluzza and Patrick Hildebrand and Ann-Kathrin Gottschalk and Daniel Braun and József Fortágh and Andreas Günther},
journal= {arXiv preprint arXiv:2506.11923},
year = {2025}
}