Magnetism of step-decorated Fe on Pd(110)

We investigate the growth and magnetic properties of submonolayer Fe wedges on a stepped Pd(110) substrate with reflection high-energy electron diffraction (RHEED) and the surface magneto-optic Kerr effect. RHEED suggests that Fe atoms decorate the steps to form nanostripes. These stripes are ferromagnetic above 0.3 monolayer Fe coverage, or \ensuremath{\sim}6 \AA{} average stripe width, and have a magnetic easy axis along the surface normal. The onset temperatures of the broadened transition exhibit finite-size scaling with a shift exponent \ensuremath{\lambda} of $1.2\ifmmode\pm\else\textpm\fi{}0.3,$ consistent with two-dimensional Ising expectations. The coercivity is less temperature dependent than the magnetization.