  We measured geometric and magnetic properties of Co films on the Pd(111)
surface by x-ray photoelectron diffraction (XPD), x-ray magnetic circular
dichroism (MCD) at the Co L_{2,3} edge, and the surface magneto-optical Kerr
effect (SMOKE) measurements. Co thin films are found to grow incoherently with
fcc island structure on the smooth Pd(111) substrate. Comparison of MCD and
SMOKE measurements of Co thin films grown on rough and smooth Pd(111) surfaces
suggests that perpendicular remanent magnetization and Co orbital moment are
enhanced by the rough interface. Pd capping layer also induces perpendicular
orbital moment enhancement. These observations indicate the influence of
hybridization between Co 3d and Pd 4d at the interface on the magnetic
anisotropy.
