Large Anomalous Hall Current in a Topological Ferromagnetic Van Der Waals Material

Two-dimensional van der Waals materials have shown interesting spin-related properties and promise for spintronic applications. Up to now, however, most of the studies on vdW materials has been focused on non-magnetic materials because magnetic vdW materials are relatively rare. Here we report the large anomalous Hall effect of a metallic ferromagnetic vdW material Fe₃GeTe₂, which has the highest Curie temperature of T_c ~ 220 K among FM vdW materials. In this system, large Berry curvature in the momentum space is induced by topological nodal lines, which is protected by crystalline symmetries. This turns out to make Fe₃GeTe₂ having the largest anomalous Hall angle and anomalous Hall factor among metallic ferromagnets, demonstrating its great potential for various spin and orbital-dependent electronic functionalities.