STM study of preferential growth of one-dimensional nickel islands on a Cu 100/- 2(2 =(2/R458-O surface

Aggregation of Cu and Ni adatoms on oxygen preadsorbed Cu 100.was studied by STM. Cu deposited on a Cu 100. c 2=2.-O surface agglomerate into anisotropic islands with a 2ʹ2 =ʹ2.R458-O structure, while Ni deposited on a c 2=2.-O surface forms isotropic Ni islands with c 2=2.-O structure. On the other hand, Ni on a 2ʹ2 =ʹ2.R458-O structure undergoes extremely anisotropic aggregation, which forms Ni-wires with a c 2=2.-O structure. Formation of Ni-wire on a 2ʹ2 =ʹ2.R458-O structure has been inferred by a preferential nucleation along the Cu atom missing trough inlaid with Ni. q1998 Elsevier Science B.V. All rights reserved