Analytic representation of Bloch walls in thin ferromagnetic films

Abstract

The magnetization distribution in asymmetric 180° Bloch walls in thin ferromagnetic films is approximated by analytic functions, containing eight variable parameters. The wall energy is evaluated numerically using approximations similar to those of LaBonte (1969). The wall structure is calculated by minimizing the wall energy with respect to the parameters. The magnetization configuration is a fairly good approximation to that derived by LaBonte (1969) using a full numerical method, but the present model enables the configuration to be calculated much more easily once the values of the parameters are known. Changes in the wall structure and energy as a function of film thickness, anisotropy constant and saturation magnetization are investigated.