Charge and magnetization inhomogeneities in diluted magnetic semiconductors

Timm, Carsten

Publication

Charge and magnetization inhomogeneities in diluted magnetic semiconductors

Timm, Carsten

Abstract

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.