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arXiv · 2201.06450

Scanning nitrogen-vacancy center magnetometry in large in-plane magnetic fields

P. Welter·J. Rhensius·A. Morales·M. S. Wörnle·C. -H. Lambert·G. Puebla-Hellmann·P. Gambardella·C. L. Degen
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Abstract

Scanning magnetometry with nitrogen-vacancy (NV) centers in diamond has emerged as a powerful microscopy for studying weak stray field patterns with nanometer resolution. Due to the internal crystal anisotropy of the spin defect, however, external bias fields -- critical for the study of magnetic materials -- must be applied along specific spatial directions. In particular, the most common diamond probes made from {100}-cut diamond only support fields at an angle of $\theta = 55^\circ$ from the surface normal. In this paper, we report fabrication of scanning diamond probes from {110}-cut diamond where the spin anisotropy axis lies in the scan plane ($\theta=90^\circ$). We show that these probes retain their sensitivity in large in-plane fields and demonstrate scanning magnetometry of the domain pattern of Co-NiO films in applied fields up to 40 mT. Our work extends scanning NV magnetometry to the important class of materials that require large in-plane fields.

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P. Welter, J. Rhensius, A. Morales, M. S. Wörnle, C. -H. Lambert, G. Puebla-Hellmann, P. Gambardella, C. L. Degen. 2022-01-17. Scanning nitrogen-vacancy center magnetometry in large in-plane magnetic fields. https://doi.org/10.1063/5.0084910

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