  We present a scaling theory of magneto-transport in Anderson-localized
disordered ferromagnets. Within our framework a pronounced
magnetic-field-sensitive resistance peak emerges naturally for temperatures
near the magnetic phase transition. We find that the resistance anomaly is a
direct consequence of the change in localization length caused by the magnetic
transition. For increasing values of the external magnetic field, the
resistance peak is gradually depleted and pushed towards higher temperatures.
Our results are in good agreement with magneto-resistance measurements on a
variety of disordered magnets.

Materials Science