We
report on a low-temperature atomic force microscropy manipulation
of Co atoms in ultrahigh vacuum on an oxidized copper surface in which
the manipulated atom is kept delocalized above several surface unit
cells over macroscopic times. The manipulation employed, in addition
to the ubiquitous short-range tip-generated chemical forces, also
long-range forces generated via Friedel oscillations of the metal
charge density due to Co nanostructures prearranged on the surface
by lateral manipulation. We show that our manipulation protocol requires
mechanical control of the spin state of the Co atom
