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The anomalous Hall effect (AHE) in L10 FePd1-xPtx alloy films is studied both experimentally and theoretically. We find that the intrinsic contribution (?sigma^int_AH) to the AHE can be significantly increased whereas the extrinsic side-jump contribution (sigma^?sj_AH) can be continuously reduced from being slightly larger than sigma^?int_AH in L10 FePd to being much smaller than sigma^?int_AH in L10 FePt, by increasing the Pt composition x. We show that this chemical composition tuning of thedoi:10.1103/physrevlett.109.066402 pmid:23006287 fatcat:k4ocunfp2bhzvgokid47wdki74