The Spin-orbit Coupling And The Stability Research Of Ir(111) Surface

The barrier of the energy dissipation of traditional nano-scale electron device has became one main restriction of the further development of the micro-electronics.On the other hand,the utilization of another property of electron,namely spin,in the newly micro-electronic device,is a promising way to leap over the obstacle faced before.Spintronics,as the emerging inter-discipline,which is the combination of the microelectronics and magnetism,thus provides a useful and novel way for people to manipulate the spin of the electron.Of all the branches of the field of the Spintronics,the spin-orbit coupling(abbreviated as SOC),is one crucial embranchment and much attention is worth to be paid,because the SOC offers an effective way of using the external electronic field to manipulate the spin of electron,a way that the previous less effective approach of using the external magnetic field and magnetic material to manipulate the spin is no long in consideration.In this Article,the Ir(111)surface state is performed by using Density Functional Theory(abbreviated as DFT)on the basis of the Projector-Augmented Wave(abbreviated as PAW)formalism.The article will be divided into five chapters.In the chapter 1,the introductory spintronics is briefed,and the basic principle of SOC as well as the recent progress on metal films is presented.In the chapter 2,the various techniques are reviewed from the point of view of theoretical respect,including DFT,Local Density Approximation(abbreviated as LDA),as well as a general review of the Vienna Ab-inito Simulation Package(abbreviated as VASP),which is practical software based on the Local Spin-Density Approximation(LSDA).In the chapter 3,the SO effect in the ultrathin film of Ir is explicitly approached.The surface state of the film arises from the SOC is explicitly analyzed by using the PAW method.In the chapter 4,the stability of the surface state of Ir(111)is studied.The origin of the protected mechanisms,means the stabilization of surface state of Ir(111),is accounted from the standpoint of the hybridization of the energy band.The finale chapter presents a brief summary of the thesis.