Imaging magnetic structure in Van der Waals ferromagnets using nanoSQUID microscopy

Van der Waals ferromagnets have been shown to host a variety of magnetic phenomena, including gate-and magnetic field-tunable transitions between ferromagnetic and layer antiferromagnetic states. I will present high resolution spatial maps of magnetic structure in exfoliated chromium iodide heterostructures, obtained using a scanning nanoscale SQUID on tip microscope, which provides sub-100 nm spatial resolution of magnetic domains across a wide range of magnetic fields spanning the coercive fields of these materials.