Imaging current control of magnetization in Fe₃GeTe₂ with a widefield nitrogen-vacancy microscope

Van der Waals (vdW) magnets are appealing candidates for realising spintronic devices that exploit current control of magnetization (e.g. switching or domain wall motion), but so far experimental demonstrations have been sparse, in part because challenges associated with imaging the these systems. Widefield nitrogen-vacancy (NV) microscopy allows rapid, quantitative magnetic across entire vdW flakes, ideal capturing changes micromagnetic structure due to an electric current. Here we use a widefield NV microscope study effect injection thin flakes ($\sim10$nm) ferromagnet Fe$_3$GeTe$_2$ (FGT). We first observe current-reduced coercivity on individual level, where FGT causes substantial reduction field required locally reverse magnetisation. then explore possibility current-induced domain-wall motion, and provide preliminary evidence such motion under relatively low densities, suggesting existence strong torques our devices. Our results illustrate applicability phenomena magnets, highlight efficient by direct without assistance from adjacent conductor, motivate further investigations currents other magnets.