Electronic structure of C co-doped (Ga, Fe)N-based diluted magnetic semiconductors

We report results of the study on GaN doped with Fe and co-doped with Carbon (C), for acceptors defect, making use of the spin-polarized relativistic Korringa-Kohn-Rostoker coherent-potential approximation method. In order to understand and to explain the half-metallicity and ferromagnetism stability, observed in Ga 0.95 Fe 0.05 N with acceptor defects, we calculated the electronic structure and magnetic properties of p-type Ga 0.95 Fe 0.05 N. Furthermore, comparison between the electronic structure of the substitutional and interstitial carbon in (Ga, Fe)N is also given. Mechanism of exchange interaction between magnetic ions in Ga 0.95 Fe 0.05 N with acceptor defect is investigated. The hyperfine interaction has been calculated for the disordered alloy systems Ga 0.95 Fe 0.05 N 1-x C x (0.01 ≤ x ≤ 0.08).