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We show that the well-established universal scaling σ AHE ∼ σ 1.6 between anomalous Hall and longitudinal conductivities in the low conductivity regime (σ < 104 Ω−1 cm−1) transforms into the scaling σ AHE ∼ σ 2 at the onset of strong electron localization. The crossover between the two relations is observed in magnetite-derived Zn FeO thin films where an insulating/hopping regime follows a bad metal/hopping regime below the Verwey transition temperature T. Our results demonstrate that electron localization effects come into play in the anomalous Hall effect (AHE) modifying significantly the scaling exponent. In addition, the thermal evolution of the anomalous Hall resistivity suggests the existence of spin polarons whose size would decrease below T.


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