Abstract
We investigate the step decoration growth and magnetic properties of Fe grown on a curved Pt(111) single crystal by means of low-energy electron diffraction, scanning tunneling microscopy, and the surface magneto-optical Kerr effect. We find that the step-induced magnetic anisotropy enhances the Curie temperature of Fe ultrathin films. Fe grown on high-vicinal-angle surfaces has larger values of both the saturation magnetization ${M}_{s}$ and coercivity ${H}_{c}$ compared with the flat surface. ${M}_{s}(\ensuremath{\alpha})$ increases quadratically with the vicinal angle $\ensuremath{\alpha}$. The atomic steps of the vicinal surface greatly affect the magnetic properties of ultrathin Fe films. Finally we find that the step-induced surface anisotropy ${K}_{s}(\ensuremath{\alpha})$ is proportional to ${\ensuremath{\alpha}}^{4}$. The surface anisotropy of Fe on curved Pt(111) substrate is related to the numbers of atoms at the step edges and the polarization of proximal Pt atoms.
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