Calculations of ground-state spin magnetizations in Cu-coated Fe nanotubes

By using a degenerated d+s band model in the Hartree-Fock approximation, we calculate the ground-state spin local magnetic moments of Fe nanotubes with and without Cu coating. We focus on the variations of the spin local magnetic moments in the nanotube and in the coating effects. We find that the effect of the Cu coating is to change slightly the spin local magnetic moments of the Fe nanotube and to decrease the average spin local magnetic moment. In addition we find that the Cu sites develop a ferromagnetic polarization in the d electrons and an antiferromagnetic polarization in the s electrons. The total polarization in the Cu sites presents an oscillation with the distance to the center of the nanotube.