Wide Field Imaging of van der Waals Magnet Based on Spin Defects in Hexagonal Boron Nitride

Recently, two-dimensional (2D) spin defects in hexagonal boron nitride (hBN) have received immense interest due to their potential for revolutionize the performance of current quantum sensing technologies. In comparison with their conventional counterparts imbedded in three-dimensional solid-state-media, spin defects hosted by 2D hBN exhibit improved versatility for implementing ultrasensitive quantum sensing of proximal objects and remarkable compatibility to nanodevice integration. Taking advantage of boron vacancy spin defects in 2D hBN nanoflakes, we report nanoscale quantum sensing and imaging of microscopic electromagnetic properties of van der Waals magnetic materials under a broad range of experimental conditions. Our results highlight the appreciable capability of 2D spin defects in evaluating local magnetic properties of 2D quantum matter in an accessible and precise way, which can be extended readily to a broad family of cutting-edge material and device systems.