Research On The Long Range Ferromagnetic Of (Zn,Mn,Li)Se Under Double Exchange And P-D Exchange

Using the density functional calculations,we elucidate the mechanism of Li co-dopant induced enhancement of ferromagnetism of 2×2×2 and 3×3×3 cubic(Zn,Mn)Se.The doping atoms tend to get together shown in the ferromagnetic(FM)energy.All configurations are strong FM ones due to the double exchange(DE)and p-d exchange(PE).The DE and PE is shown in the partial density of states.The hole in cubic(Zn,Mn,Li)Se is average distribution,and it is the one and only parameter to decide the exchange energy,when impurity atoms keep further to each other.The average exchange of these configurations is considered as a function of square of the hole concentration c.The polynomial fitting shows that the DE and PE plays the same important role to the exchange energy.This thesis is based on the first principle method of density functional theory to study the effect of DE and PE of(Zn,Mn)Se under the condition of co-doping on the long range ferromagnetism.