Critical behavior from the anomalous Hall effect in (GaMn)As

An unconventional approach to scaling based on the anomalous Hall effect is presented and utilized to demonstrate conclusively that epitaxial (metallic) ${\text{Ga}}_{0.98}{\text{Mn}}_{0.02}\text{As}$ is a mean-field ferromagnet. Such a result provides strong support for the assertion that the underlying interactions can be treated within the framework of Landau mean-field theory, direct support for which had previously been lacking. This scaling approach also provides confirmation\char22{}albeit indirect\char22{}that the origin of the anomalous Hall effect in this system is intrinsic at the composition studied.