MAGNETIC-BEHAVIOR OF RHODIUM ON SILVER (001)

We investigate different configurations of Rh on Ag(001) to calculate the magnetic moment per atom in comparison with a free standing monola yer and bulk rhodium. Adsorbed layers, mixed layers, coated layers and islands are considered. The dependence of the magnetic moment is calc ulated with respect to the exchange integral J in a self-consistent ti ght-binding calculation with spin-independent hopping integrals but sp in-dependent diagonal terms. The calculations were done with the recur sion method using a real-space or a k-space basis. The value of J, for which we find the onset of magnetism, increases with increasing numbe r of Rh neighbours of a Rh atom. Also in a mixed Rh0.50Ag0.50 layer ma gnetism is destroyed due to a shift of the Fermi energy with respect t o the peaks in the d-state density of states of rhodium.