Influence of Anti-ferromagnetic Exchange Interaction on the Curie Temperature of(Ga,TM)As

Based on Zener Model,the dependences of Curie temperature of DMS materials(Ga,TM)As(TM=Sc,Ti,V,Cr,Mn,Fe,Co,Ni) on the doping concentration and anti-ferromagnetic exchange were discussed in detail by a theoretical computation.The results indicated that the influence of anti-ferromagnetic exchange on the Curie temperature of(Ga,TM)As should not be ignored,and the influence on the Curie temperature of n-type semiconductor is much stronger than that of p-type semiconductor.Considering the influence of the anti-ferromagnetic exchange,ferromagnetism can not obtained in the room temperature for materials except(Ga,Cr)As and(Ga,Mn)As.(Ga,Cr)As and(Ga,Mn)As display the room temperature ferromagnetism as the doping concentration reaches to 13.1% and 18%,respectively.However,when the relative strength increases to the value y=0.01,the materials do not present ferromagnetism anymore in any doping concentration.