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arXiv · 2506.11923

Bandwidth enhanced current noise suppression with a SERF magnetometer

Tobias Menold·Arianna Bertoluzza·Patrick Hildebrand·Ann-Kathrin Gottschalk·Daniel Braun·József Fortágh·Andreas Günther
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Abstract

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.

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Tobias Menold, Arianna Bertoluzza, Patrick Hildebrand, Ann-Kathrin Gottschalk, Daniel Braun, József Fortágh, Andreas Günther. 2025-06-13. Bandwidth enhanced current noise suppression with a SERF magnetometer. https://arxiv.org/abs/2506.11923

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