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Antiferromagnets exhibiting giant anomalous Hall effect (AHE) and anomalousNernst effect (ANE) have recently aroused broad interest, not only for theirpotential applications in future electronic devices, but also because of therich physics arising from the Berry curvature near the Fermi level.$\rm{Co_{1/3}NbS_2}$, by intercalating $\rm{Co^{2+}}$ ions between $\rm{NbS_2}$layers, is a quasi-two-dimensional layered antiferromagnet with a chirallattice. A large AHE has been observed in $\rm{Co_{1/3}NbS_2}$, but its originis under debate. In this letter, we report the large AHE and ANE in exfoliated$\rm{Co_{1/3}NbS_2}$ flakes. By analyzing the thermoelectric data via the Mottrelation, we determined that the observed large AHE and ANE primarily resultfrom the intrinsic Berry curvature. We also observed the magnetic domains in$\rm{Co_{1/3}NbS_2}$ by reflective magnetic circular dichroism measurements.Combined with electrical transport measurements, we confirmed that the magneticreversal in $\rm{Co_{1/3}NbS_2}$ is determined by domain wall motion, and thecritical field ($H_c$) exhibits a memory effect of consecutive magnetic sweeps.Our work provides insight into the topological properties of$\rm{Co_{1/3}NbS_2}$ and paves the way to studying the spin configuration andmagnetic domain dynamics in this fascinating antiferromagnet.

Probing the Anomalous Hall Transport and Magnetic Reversal of Chiral-Lattice Antiferromagnet Co$_{1/3}$NbS$_2$