Abstract
The magnetic domain structures in ultrathin fcc cobalt films, epitaxially grown on Cu(100), have been investigated by means of a scanning electron microscope with spin polarization analysis of the secondary electrons. In all films, ranging from 3 to 19.5 monolayers thickness, we find multidomain structures with the 〈110〉 directions as easy axes. The domain boundaries exhibit an irregular shape which is explained by a decreasing magnetostatic energy contribution to the Néel wall energy.
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