Scanning diamond magnetometers based on the optically detected magnetic resonance of the nitrogen-vacancy center offer very high sensitivity and noninvasive imaging capabilities when the stray fields emanating from ultrathin magnetic materials are sufficiently low (less than $10\mathrm{mT}$). Beyond this low-field regime, the optical signal quenches and a quantitative measurement is challenging. While the field-dependent photoluminescence from the nitrogen-vacancy center can still provide qualitative information on magnetic morphology, this operation regime remains unexplored, particularly for surface magnetization larger than approximately $3\mathrm{mA}$. Here, we introduce a multiangle reconstruction (MARE) that captures the full nanoscale domain morphology in all magnetic field regimes leading to photoluminescence quench. To demonstrate this, we use ${\mathrm{[Ir/Co/Pt]}}_{14}$ multilayer films with surface magnetization an order of magnitude larger than previous reports. Our approach brings noninvasive nanoscale magnetic field imaging capability of the nitrogen-vacancy center to the study of a wider pool of magnetic materials and phenomena.

• Received 22 January 2021
• Revised 10 June 2021
• Accepted 17 June 2021

DOI:https://doi.org/10.1103/PhysRevApplied.16.014054