Curie Temperature of Diluted Magnetic Semiconductor Material under The Anti-ferromagnetic Exchange

Mixing small amount of the magnetic transition metal or rare earth metal ions in the non-magnetic semiconductor makes it show a certain degree of magnetism,forming the diluted magnetic semiconductors (DMS). The introduction of one of the magnetic atoms,as known magnetic impurities,into the matrix as known the non-magnetic semiconductor. In this paper based on Zener model,considering the impact of the anti-ferromagnetic exchange on the Curie temperature of DMS materials,we got the function of the doping concentration and anti-ferromagnetic exchange about Curie temperature (Tc). A detailed analysis on the Curie temperature of(GaAS∶TM)(TM=Sc,Ti,V,Cr,Mn,Fe,Co,Ni) was carried out. A conclusion was drawn from the analysis. It follows:when xx0,Tc increases with x; when x=x0,Tc reaches maxima; when xx0,Tc always decreases with x increa-sing. At the same time the critical doping concentration x0 decreases gradually with y,and Curie temperature Tc always is lower.For n-type doping cases,Tc is no longers a monotone function for the x,there is a maximum value only,however,for the p-type doping Tc displays a monotonous increase.