Scanning diamond magnetometers based on the optically detected magnetic resonance of the nitrogen-vacancy centre offer very high sensitivity and non-invasive imaging capabilities when the stray fields emanating from ultrathin magnetic materials are sufficiently low (< 10 mT). Beyond this low-field regime, the optical signal quenches and a quantitative measurement is challenging. While the field-dependent NV photoluminescence can still provide qualitative information on magnetic morphology, this operation regime remains unexplored particularly for surface magnetisation larger than ∼ 3 mA. Here, we introduce a multi-angle reconstruction technique (MARe) that captures the full nanoscale domain morphology in all magnetic-field regimes leading to NV photoluminescence quench. To demonstrate this, we use [Ir/Co/Pt]14 multilayer films with surface magnetisation an order of magnitude larger than previous reports. Our approach brings non-invasive nanoscale magnetic field imaging capability to the study of a wider pool of magnetic materials and phenomena.
@article{arxiv.2101.10331,
title = {Multi-Angle Reconstruction of Domain Morphology with All-Optical Diamond Magnetometry},
author = {Lucio Stefan and Anthony K. C. Tan and Baptiste Vindolet and Michael Högen and Dickson Thian and Hang Khume Tan and Loïc Rondin and Helena S. Knowles and Jean-François Roch and Anjan Soumyanarayanan and Mete Atatüre},
journal= {arXiv preprint arXiv:2101.10331},
year = {2021}
}