The evolution of the magnetic domain structure with the thickness of Fe_1-xCoₓ alloy films deposited at room temperature on epitaxial Au(111) films is studied for $x<~0.3$ by spin-polarized low-energy electron microscopy. In contrast to pure Fe films that show no out-of-plane magnetization small amounts of Co are sufficient to induce strong perpendicular magnetization below three monolayers with a pronounced striped domain structure. A reorientation transition to in-plane magnetization is found.
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Zdyb et al. (2003) studied this question.
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