A study of the disordered dilute magnetic semiconductors Zn(1-x)Cr(x)Se and Zn(1-x)Fe(x)Se.

We report on the electronic structure and exchange interactions in the dilute magnetic semiconductors Zn(1-x)Cr(x)Se and Zn(1-x)Fe(x)Se. The exchange energies and densities of states were obtained using the layer Korringa-Kohn-Rostoker method and the coherent potential approximation. We find that the dominant exchange in all cases is the super-exchange mechanism, and it is found to be antiferromagnetic for Zn(1-x)Fe(x)Se at all concentrations.