DOMAIN-STRUCTURE IN AN ULTRATHIN FERROMAGNETIC FILM

The domain structure (DS) in an ultrathin ferromagnetic film is invest igated. In the framework of a single approach, a small-amplitude (crit ical) DS with a smooth magnetization distribution as well as DS with a finite amplitude are described. The criterion of DS existence is obta ined, and the domain size and DS amplitude are calculated for a wide r ange of film parameters. Existence of DS with out-of-plane magnetizati on in two intervals of the film thickness is predicted. Bulk and surfa ce anisotropy constants are calculated by fitting of expressions to th e experimental data.