MAGNETIC COUPLING OF 4D TRANSITION-METAL MONOLAYERS WITH BCC-FE AS A SUBSTRATE

We make a systematic study of 4d transition metal monolayers epitaxial ly grown on bcc-Fe(001). For this purpose we consider the slabs X/2Fe/ X and X/SFe/X (X = Mo, Tc, Ru, Rh and Pd) within a mean-field Hubbard model. To parametrize the surfaces we add extra orbitals outside the s lab to allow for electron spillover. This calculation gives a differen t polarization for each of the five d orbitals of the transition metal s. We find that Mo and Tc couple antiferromagnetically to Fe while Ru, Rh and Pd couple ferromagnetically. Ru presents a more critical behav iour than any other 4d transition metal.