Nonlinear dynamics of domain walls in three-layer magnetic films with nanosized layers

Abstract

Nonstationary dynamics of domain walls in thin multilayer magnetic films with nanosized layers has been investigated using numerical solution of the nonlinear Landau-Lifshitz equation with exact consideration of all major interactions: exchange, magnetoanisotropic, and dipole-dipole (in continuum approximation). Scenarios have been established of nonlinear dynamic transformation of internal wall structure in three-layer films with layers with different saturation magnetization. It has been demonstrated that any velocities of nonstationary motion of the walls (average over the period, maximum over the period, preset at fixed fields) in layered films with the magnetizations of middle layers lower than the magnetization of outer layers are always higher than the velocities of one-layer films of the same thickness with the same average saturation magnetization as in multilayer films.