Studies On Quantum Exchange Action Of The Magnetic Material

Exchange action is an interaction way of electrons. It is also the theoretical basis of spontaneous magnetization that the magnetic material produce. For the technical magnetization, magnetic domain theory theoretical basis for the magnetic mechanism of magnetic material. The formation of the magnetic domain is the important researching aver of the magnetic domain theory. The exchange action of the electrons in the magnetic material is the main basis of the magnetic domain formation. Then the research of the microcosmic essence of the ferromagnetism, antiferromagnetism, ferromagnetism that the macrostructure shows.Firstly, the thesis presented the macro display of the traditional magnetic material, summarized the physical phenomenon of the ferromagnetic material and the explanation from classical physics. Secondly, the thesis is an analysis of the treatment and basis result of the magnetic physical phenomenon by the molecular field theory. At the end of the thesis, the new concept of the magnetic domain splitting was given.In the thesis, the three typical base model of the quantum exchange action between the ferromagnet'ics was discussed. They were direct exchange action model, indirect exchange action model, RKKY exchange action model. In the direct exchange action model, the concept of the exchange action lead by W.Heitler & F.London approximation of hydrogen molecular. On the base of these, the theoretical analysis of W. Heisenberg exchange action model was made. The physical origin of the ferromagnetism and antiferromagnetism was explained. For the indirect exchange action, the three-centered, four-elections model was analyze emphatically. Because it could well explain the original problem of the transition metal sul'phurate compound and antiferromagnetism. The discussion of RKKY exchange action aimed at the help for the understanding of the rear-earth metal's magnetic structure.This three models could help us deeply understand the concept of the exchange action.At the existing theoretical level, according to the analysis of the ferromagnet'ics magnetic moment rotation and the changing pattern of the exchange factors under external magnetic field, the thesis mentioned that the exchange resistance moment raised by theexchange action maybe was a multinomial contained plus-minus terms. In a certain dielectric space 8v and a changing external magnetic field, the resultant resistance moment L_R thataffect the magnetic moment rotation maybe was a multinomial contained puss-minus terms. According to the hypothesis, the thesis deduced that the magnetic domain splitting maybe appeared when the ferromagnet'ics was magnetized. In order to explain the objectivity of the magnetic domain splitting, the thesis provided two series of photomi'crographys explained that magnetic domain splitting was the new mechanism when the ferromagnet'ics was magnetized. This new concept could help develop the ferromagnet'ics theory and magnetizing technology.The main achievements of the research were: firstly, the resultant multinomial of the resistance moment in the magnetic domain rotation was analyze for the first time. Secondly, it forecast a new magnetic phenomenon. Then, new concept of the magnetic domain splitting was given. At last, the researching result of the magnetic domain splitting verity the objectivity of the concept of the magnetic domain splitting.