STRUCTURE AND LOCAL ORDER OF THIS COBALT FILMS ON CU(111)

We have studied thin cobalt films deposited on Cu(1 1 1), from 0.5 to 8 ML (monolayer). We have found that for all the thicknesses, the in-plane nearest neighbour distance is 2.53 Angstrom, and the out-of-plane one is 2.50 Angstrom. Moreover, we have used the FEFF co de to simulate the polarization-dependent shape of the Fourier transforms of HCP and FCC crystals. We conclude that below 3 ML, the cobalt is clearly prolonging the copper lattice, but that beyond this thickness, HCP domains are appearing.