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Abstract
The influence of surface atomic step density on the magnetic moment of Cr layers on Fe(001) has been studied in situ by Alternating Gradient Magnetometry (AGM). Contrary to previous results on flat surfaces where large Cr moments were observed coupled antiferromagnetically to their Fe nearest neighbours, the sample moment remains essentially unchanged if Cr is deposited on a strongly faceted Fe surface. During addition of a second Fe layer on a 6 ML Cr/Fe(001) film the sample moment stays constant up to an average Fe thickness of 5 ML and increases linearly with the nominal Fe thickness for thicker layers. This behaviour is interpreted as topological antiferromagnetism due to the specific step structure of the surface in agreement with recent tight binding calculations.
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