Magnetic moments and anisotropies in smooth and rough surfaces and interfaces

The relation between the magnetic surface and step moments and anisotropies in free and Pd-covered Fe(110) surfaces is studied experimentally by torsion oscillation magnetometry (TOM) of ultrathin Fe(110) films on W(110) in situ in UHV before, during and after Pd coverage. As a result of Pd coverage, the excess surface moment is enhanced by 0.70 mu(B) per surface atom. The enhancement is restricted to the first monolayer of Pd. Near [001] steps, the additional excess step moment is reduced by 0.65 mu(B) by Pd. The surface anisotropies of both free and Pd-covered Fe(110) surfaces support perpendicular magnetization. Near [001] steps, they are enhanced by additional step anisotropies, of equal sign and order of magnitude, if expressed by anisotropy energy per atom.