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(Color online) (a) The surface structure is schematically shown. The unit cells are specified using black rectangles. This surface contains 0.75 ML Cu and 0.5 ML O. Two reconstruction domains can be observed with the orientation of their unit cell perpendicular to each other. The domain boundary is denoted by grey thick lines. The arrows show the Cu hopping which, will lead to the migration of the domain boundary.
(Color online) (a) After 0.05 ML of Co was deposited on the surface, elongated islands as well as scattered individual atoms and clusters are observed. (b) Atomically resolved STM image of the island surface. The unit cell is marked using a black rectangle. (c) and (d) Two STM images extracted from a STM movie with a time interval of . The constant relative positions show the scattered Co atoms are immobile.
(Color online) (a)–(c) STM images for (a) 0.2-, (b) 0.4-, and (c) 0.6-ML Co deposited at RT. The image size is 2. (d) A STM image showing the structured Co patches for the 0.6-ML sample. (e) The statistical island coverage is plotted vs the amount of deposited Co. The broken line with a slope of 0.75 is a guide for the eye. (f) and (g) STM images of 0.2- and 0.45-ML Co deposited at 450 and , respectively. The images have a size of .
(Color online) STM images resulted after (a) 0.45-ML Co deposited at on clean Cu(001), (b) 0.45-ML Co deposited at on clean Cu(001) and annealed at for , (c) 0.45-ML Co deposited at and subsequently exposed to oxygen at RT and finally annealed at for , (d) the sample used for (c) was further annealed at for .
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