Widefield Quantum Sensor for Vector Magnetic Field Imaging of Micromagnetic Structures

• URL: http://arxiv.org/abs/2512.03748v1
• Date: Wed, 03 Dec 2025 12:46:36 GMT
• Title: Widefield Quantum Sensor for Vector Magnetic Field Imaging of Micromagnetic Structures
• Authors: Orlando D. Cunha, Filipe Camarneiro, João P. Silva, Hariharan Nhalil, Ariel Zaig, Lior Klein, Jana B. Nieder,
• Abstract summary: We implement a camera-compatible pulsed optically detected magnetic resonance protocol to reconstruct stray-field vectors from microscale devices.<n>Our implementation achieves a spatial resolution of $approx 0.52 mathrmm$ across an $83mathrmm times 83mathrmm$ field of view and a peak sensitivity of $ (828 pm 142)mathrmnT,Hz-1$, with acquisition times of only a few minutes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Many spintronic, magnetic-memory, and neuromorphic devices rely on spatially varying magnetic fields. Quantitatively imaging these fields with full vector information over extended areas remains a major challenge. Existing probes either offer nanoscale resolution at the cost of slow scanning, or widefield imaging with limited vector sensitivity or material constraints. Quantum sensing with nitrogen-vacancy (NV) centers in diamond promises to bridge this gap, but a practical camera-based vector magnetometry implementation on relevant microstructures has not been demonstrated. Here we adapt a commercial widefield microscope to implement a camera-compatible pulsed optically detected magnetic resonance protocol to reconstruct stray-field vectors from microscale devices. By resolving the Zeeman shifts of the four NV orientations, we reconstruct the stray-field vector generated by microfabricated permalloy structures that host multiple stable remanent states. Our implementation achieves a spatial resolution of $\approx 0.52 ~μ\mathrm{m}$ across an $83~μ\mathrm{m} \times 83~μ\mathrm{m}$ field of view and a peak sensitivity of $ (828 \pm 142)~\mathrm{nT\,Hz^{-1}}$, with acquisition times of only a few minutes. These results establish pulsed widefield NV magnetometry on standard microscopes as a practical and scalable tool for routine vector-resolved imaging of complex magnetic devices.

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