ABSTRACT
The homogenous alloy (Ga,Mn)N exhibits anti-ferromagnetic Mn-Mn interaction and undergoes a spin-glass transition at temperatures around 5 K. Ferromagnetism is observed at room-temperature and above for insulating (Ga,Mn)N with a Mn-content of 14%. This ferromagnetism is not an intrinsic property of (Ga,Mn)N but originates from nm-scale Mn-rich clusters formed during growth.
