Research On Enhancement Of Curie Temperature Of ?-DMS By Shape Deformation

In the last few years, the spintronics has developed in research field of the condensed matter physics, which has gradually become an important research direction in this field. It is known that the theoretical research should consider the actual experimental environment. The efficient spin source is the most important condition for spintronics. According to much previous studies, the spin current induced by the traditional ferromagnetic metal is scattered when goes through the interface of metal and semiconductors. Diluted magnetic semiconductors(DMS) have been found to solve the problem.For the convenience of experiments, DMS need to produce spin current at room temperature.Therefore, the search for DMS with ferromagnetism at room temperature become the key point.Which DMS are ferromagnetic at room temperature? How to enhance the Curie temperature of systems of DMS? These problems are valuable to be studied.This thesis studies some ways to enhance the Curie temperature and electronic structures of materials with ferromagnetism. Chapter 1 of this paper is introduction. Chapter 2 is the method of calculations. Chapter 3 is the enhancement of ferromagnetism in ?-(Zn,Mn,Li)Se by shape deformation. Chapter 4 is effect of tensile strain to ferromagnetism in ?-(Ga,Mn)As film. Chapter 5 is for conclusion.