It is predicted that III-V diluted magnetic semiconductors can exhibit stripelike modulations of magnetization and carrier concentration. This inhomogeneity results from the strong dependence of the magnetization on the carrier concentration. Within Landau theory, a characteristic temperature T-* below the Curie temperature is found so that below T-* the equilibrium magnetization shows modulations, which are strongly anharmonic. The wavelength and amplitude of the modulation rise for decreasing temperature, starting from zero at T-*. Above T-*, the equilibrium state is homogeneous, but the coupling between charge and magnetization leads to the appearance of an electrically charged layer in domain walls.
Timm, C. Charge and magnetization inhomogeneities in diluted magnetic semiconductors. PHYSICAL REVIEW LETTERS. March 2006. 96(11)