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Emergent color centers with accessible spins hosted by van der Waalsmaterials have attracted substantial interest in recent years due to theirsignificant potential for implementing transformative quantum sensingtechnologies. Hexagonal boron nitride (hBN) is naturally relevant in thiscontext due to its remarkable ease of integration into devices consisting oflow-dimensional materials. Taking advantage of boron vacancy spin defects inhBN, we report nanoscale quantum imaging of low-dimensional ferromagnetismsustained in Fe3GeTe2/hBN van der Waals heterostructures. Exploiting spinrelaxometry methods, we have further observed spatially varying magneticfluctuations in the exfoliated Fe3GeTe2 flake, whose magnitude reaches a peakvalue around the Curie temperature. Our results demonstrate the capability ofspin defects in hBN of investigating local magnetic properties of layeredmaterials in an accessible and precise way, which can be extended readily to abroad range of miniaturized van der Waals heterostructure systems.

Wide Field Imaging of van der Waals Ferromagnet Fe3GeTe2 by Spin Defects in Hexagonal Boron Nitride