Structure and magnetism of self-organized Ni nanostructures on Cu(001)

Ni films are grown at room temperature on (i) flat and (ii) pre-nanostructu red Cu(0 0 1) surfaces and studied in situ via scanning tunneling microscop y and the magneto-optic Kerr effect. In the first case, we demonstrate that controllable Ar+ bombardment of 30-45 monolayer thick Ni/Cu(0 0 1) films r esults in the formation of self-organized pseudoperiodic nanostructures. Th e nanostructuring process rotates the easy-magnetization axis of the 45 mon olayer Ni/Cu(0 0 1). In the second case, during the growth of Ni on pre-nan ostructured Cu(0 0 1), neither preferential decoration of step-edges by mat erial nor filling of the Cu-craters occurs. The growth mode resembles that of Ni on vicinal Cu(0 0 1) surfaces. (C) 2000 Elsevier Science B.V. All rig hts reserved.