Magnetic domain walls in ultrathin fcc cobalt films

The micromagnetic structure of 180^∘{}-domain walls in ultrathin cobalt films, grown on Cu(100), has been investigated by means of SEMPA. The comparison of our experimental data with one-dimensional micromagnetic calculations demonstrates that the magnetostatic energy has a pronounced influence on the domain-wall structure, even in the monolayer thickness range. Discrepancies between experimental observations and the one-dimensional model may be explained by a two-dimensional in-plane structure of the domain walls.