MICROMAGNETIC SIMULATION OF 90-DEGREES DOMAIN-WALLS IN THIN IRON FILMS

The micromagnetic structure and energy of 90 degrees domain walls in c rystalline iron having a (100) surface and ranging in thickness from 3 0 to 200 nm have been investigated numerically by minimization of the total wall energy using a slightly modified LaBonte method similar to that described by Aharoni and Jakubovics. For films of thickness in th e range of 30-110 nm, both symmetric and asymmetric stable Neel wall s tructures were obtained. Below 45 nm, the former has the lower energy. Above 110 nm, only the asymmetric structure could be obtained. In add ition to the wall energies, we provide measures of the wall width and data on the stray field external to the film for comparison with magne tic force microscopy studies. (C) 1997 American Institute of Physics.