Numerical simulation of strongly nonequilibrium processes in magnets based on physical kinetics equations

Аннотация

Numerical simulation of magnets plays the key role in the development of various devices of spintronics. As a rule, the physical-mathematical models of magnets are built based on the Landau-Lifshitz equations. For example, in deriving the Landau-Lifshitz-Bloch equations, the most usable micromagentic approach, the multiplicative approximation of the mean field corresponding in the stationary case to the Curie-Weis theory, was used implicitly. In this work it is shown that in the description of sample remagnetization, such an approximation yields the qualitatively wrong results. The phenomenological accounting for correlations between the nearest neighbors allows one not only to obtain the correct values of the critical temperature and the behavior of the system energy but also to describe qualitatively the strongly nonequilibrium processes of remagnetization.