  It is predicted that III-V diluted magnetic semiconductors can exhibit
stripe-like 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. 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.
