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The recent emergence of two-dimensional (2D) van der Waals ferromagnets hasprovided a new platform for exploring magnetism in the flatland and fordesigning 2D ferromagnet-based spintronics devices. Despite intensive studies,the anomalous Hall effect (AHE) mechanisms in 2D van der Waals ferromagnetshave not been investigated yet. In this paper, we report the AHE mechanisms inquasi-2D van der Waals ferromagnet Fe0.29TaS2 via systematically measuringFe0.29TaS2 devices with thickness from 14 nm to bulk single crystal. The AHEmechanisms are investigated via the scaling relationship between the anomalousHall and channel conductivities. As the Fe0.29TaS2 thickness decreases, themajor AHE mechanism changes from extrinsic scattering to intrinsiccontribution. The crossover of the AHE mechanisms is found to be highlyassociated with the channel conductivities as the Fe0.29TaS2 thickness varies.

Anomalous Hall effect mechanisms in quasi-2D van der Waals ferromagnet Fe0.29TaS2