POLARIZATION OF DIFFERENT INTERFACES OF RH AND AG STUDIED BY RECURSION TECHNIQUES

We investigate the reasons for the discrepancy between experimental an d theoretical findings concerning the onset of magnetic moment when Rh , which is nonmagnetic in the bulk form, is coated on Ag(001). To perf orm the calculation we use a recently developed recursion method in th e reciprocal space for the derivation of the density of states of mult ilayered systems. The local magnetic moments are deduced versus the ex change integral J. We found that a single-monolayer of Ph epitaxially grown on Ag(001) presents a high magnetic moment. This magnetic moment decreases when the Ph monolayer is covered by a Ag overlayer. However , the magnetic moment is not entirely killed as obtained also previous ly by recent full-potential linearized-augmented-plane-wave calculatio ns. Therefore, there seems to be a discrepancy with recent surface-mag neto-optic-Kerr effect experiments which have not detected any long-ra nge order in the case of a monolayer of Ph on Ag(001). We study interm ixing effects between Ph and Ag using different model structures conta ining ordered Ag.50Rh.50 layers. The disappearance of magnetism in exp erimentally studied samples can be explained by such intermixing effec ts.