MAGNETIC DIMERS OF TRANSITION-METAL ATOMS ION THE AG(001) SURFACE

The magnetic properties of transition-metal dimers on Ag(001) are calc ulated in the local-spin-density approximation by means of a Korringa- Kohn-Rostoker Green's function technique. It is shown that many transi tion metals which are nonmagnetic in their bulk form are magnetic as d imers on the Ag(001) surface. The surface-dimer interaction is studied by comparing the magnetic moments of supported and free dimers. The i ncreased sp-d hybridization with the substrate strongly decreases the magnetic moments of 4d and 5d dimers in comparison with the 3d ones. H owever, for these series magnetic dimers with large moments also exist .