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arXiv · 2205.06579

Fast scanning nitrogen-vacancy magnetometry by spectrum demodulation

P. Welter·B. A. Josteinsson·S. Josephy·A. Wittmann·A. Morales·G. Puebla-Hellmann·C. L. Degen
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Abstract

We demonstrate a spectrum demodulation technique for greatly speeding up the data acquisition rate in scanning nitrogen-vacancy center magnetometry. Our method relies on a periodic excitation of the electron spin resonance by fast, wide-band frequency sweeps combined with a phase-locked detection of the photo-luminescence signal. The method can be extended by a frequency feedback to realize real-time tracking of the spin resonance. Fast scanning magnetometry is especially useful for samples where the signal dynamic range is large, of order millitesla, like for ferro- or ferrimagnets. We demonstrate our method by mapping stray fields above the model antiferromagnet $\alpha$-Fe$_2$O$_3$ (hematite) at pixel rates of up to 100\,Hz and an image resolution exceeding one megapixel.

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P. Welter, B. A. Josteinsson, S. Josephy, A. Wittmann, A. Morales, G. Puebla-Hellmann, C. L. Degen. 2022-05-13. Fast scanning nitrogen-vacancy magnetometry by spectrum demodulation. https://arxiv.org/abs/2205.06579

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