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Reorientation transition of ultrathin cobalt films on Au(111)
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Three MFM images of cobalt deposited on gold. The numbers within the images indicate the nominal film thickness in monolayers. Tip magnetization is perpendicular to the surface. At low coverages (2 ML) bright and dark areas, which correspond to out-of-plane domains are observed. The contrast vanishes at 4.3 ML coverage. At 6 ML coverage the magnetic contrast reappears, but now domain walls are imaged - a typical signature of domains with in plane magnetization. The observed contrast change clearly indicates a thickness dependent reorientation of the magnetization direction in the cobalt film.
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