# High-Dynamic-Range Integrated NV Magnetometers

## TL;DR

A new magnetometer using diamond nitrogen-vacancy centers can measure magnetic fields with high precision and a much wider range than before.

## Contribution

An innovative frequency-tracking scheme expands the dynamic range of NV center magnetometers by 34 times.

## Key findings

- The dynamic range of the magnetometer was expanded to 6.4 mT.
- The system detects rapidly changing magnetic fields at a rate of 0.038 T/s.

## Abstract

High-dynamic-range integrated magnetometers demonstrate extensive potential applications in fields involving complex and changing magnetic fields. Among them, Diamond Nitrogen Vacancy Color Core Magnetometer has outstanding performance in wide-range and high-precision magnetic field measurement based on its inherent high spatial resolution, high sensitivity and other characteristics. Therefore, an innovative frequency-tracking scheme is proposed in this study, which continuously monitors the resonant frequency shift of the NV color center induced by a time-varying magnetic field and feeds it back to the microwave source. This scheme successfully expands the dynamic range to 6.4 mT, approximately 34 times the intrinsic dynamic range of the diamond nitrogen-vacancy (NV) center. Additionally, it achieves efficient detection of rapidly changing magnetic field signals at a rate of 0.038 T/s.