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We study the effect of disorder on the anomalous Hall effect (AHE) intwo-dimensional ferromagnets. The topological nature of AHE leads to theinteger quantum Hall effect from a metal, i.e., the quantization of$\sigma_{xy}$ induced by the localization except for the few extended statescarrying Chern number. Extensive numerical study on a model reveals thatPruisken's two-parameter scaling theory holds even when the system has no gapwith the overlapping multibands and without the uniform magnetic field.Therefore the condition for the quantized AHE is given only by the Hallconductivity $\sigma_{xy}$ without the quantum correction, i.e., $|\sigma_{xy}|> e^2/(2h)$.Comment: 5 pages, 4 figures, REVTe

Quantized Anomalous Hall Effect in Two-Dimensional Ferromagnets: Quantum Hall Effect in Metals