Abstract
A magnetic system such as Fe∕Pt shows strong magnetic anisotropy due to the contribution of the interface. Pt is known to be nearly ferromagnetic and can have an induced magnetic moment when it is in proximity to 3d ferromagnetic atoms. Both the magnetic moment and the magnetic anisotropy of the materials are enhanced on the step surface due to the symmetry breaking by the introduction of atomic steps on vicinal substrate. In order to study the effect of step-induced anisotropy, we investigate the magnetic properties of Fe grown on a curved Pt(111) single crystal that provides a continuous gradient in step density. Fe grown on high vicinal angle surfaces has larger values of both the saturation magnetization Ms and coercivity HC compared with the flat surface. The atomic steps of the vicinal surface greatly affect the magnetic properties of ultrathin Fe films. The anisotropy of Fe on the curved Pt(111) surface is related to the step density of the substrate.
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