Tunable magnetism and anomalous Hall effect in magnetic Weyl semimetal Co3Sn2S2

Abstract

As a magnetic Weyl semimetal with broken time-reversal symmetry, kagome-lattice Co3Sn2S2 exhibits various exotic transport phenomena due to its nontrivial band structure. Here, we selected Fe and Ni as representative dopants and employed both individual and co-doping strategies to regulate the magnetic and transport properties. At specific doping concentrations, both elements induce significant changes in coercivity and magnetic moment, which are clearly reflected in the switching field and magnitude of the anomalous Hall effect (AHE). Qualitative and quantitative analysis based on the separation models and theoretical calculations reveal that the AHE is dominated by the intrinsic mechanism related to the Berry curvature of electronic band structures. This work demonstrates that appropriate disordered doping can effectively introduce domain wall pinning behavior while retaining the intrinsic Berry curvature dominant essence of the AHE, providing important guidance for the design of AHE in magnetic topological materials.