Structure and energy of two-dimensional Bloch walls in thin and thick magnetic films

A new method for determining analytical functions describing the structure of the Bloch two-dimensional walls and containing the minimum number of variable parameters is suggested. Investigated was theoretically the structure and energy of the Bloch two-dimensional walls and one-axial weak anisotropic magnetic films depending on film thickness and shown was that the wall has a vortex structure for a film thickness less than 1 μm and wall energy is determined mainly by a value of exchange energy. Magnetostatical energy decreases with the growth of film thickness and vanishes completely at a film thickness over 3000 A. A layer, where one-dimensional change in magnetization in the wall width occurs in depth of the film thicker than 1 μm and the layer thickness increases with the growth of film thickness. The Bloch one-dimensional walls of closed type take place for thick films when the turn of magnetization over the whole film thickness is performed in the Bloch one-dimensional wall and on the film surface in a thin layer the magnetization turn is analogous to the turn of the Neel one-dimensional wall with opposite direction of magnetization on different surfaces of the film