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The exploration of nontrivial transport phenomena associated with theinterplay between magnetic order and spin-orbit coupling (SOC), particularly invan der Waals (vdW) systems has gained a resurgence of interest due to theireasy exfoliation, ideal for two-dimensional (2D) spintronics. We report thenear room temperature quasi-2D ferromagnet, Fe$_4$GeTe$_2$ from the iron-basedvdW family (Fe$_n$GeTe$_2$, $n$=3,4,5), exhibiting a large anomalous Hallconductivity (AHC), $\sigma^A_{xy}$ $\sim$ 490 $\Omega^{-1}\textrm{cm}^{-1}$ at2 K. The near quadratic behavior of anomalous Hall resistivity($\rho^{A}_{xy}$) with the longitudinal resistivity ($\rho_{xx}$) suggests thata dominant AHC contribution is coming from an intrinsic Berry curvature (BC)mechanism. Concomitantly, the electronic structure calculations reveal a largeBC arising from SOC induced gaped nodal lines around the Fermi level, governingsuch large AHC property. Moreover, we also report an exceptionally largeanomalous Hall angle ($\simeq$ 10.6\%) and Hall factor ($\simeq$ 0.22 V$^{-1}$)values which so far, are the largest in compared to those for other members inthis vdW family.

Anomalous Hall effect induced by Berry curvature in topological nodal-line van der Waals ferromagnet Fe$_4$GeTe$_2$