Nucleation, growth and morphology of Co thin films on Ag(1 1 0) |
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Authors: | IC Senevirathne O Kizilkaya RL Kurtz PT Sprunger |
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Institution: | aDepartment of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Baton Rouge, LA 70803, United States;bCenter for Advanced Microstructures and Devices, Louisiana State University, Baton Rouge, LA 70806, United States |
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Abstract: | Scanning tunneling microscopy (STM) experiments reveal that Co growth on Ag(1 1 0), at coverages of Co < 1 ML and low substrate temperatures (150 K), involves a concomitant insertion of Co into the top Ag layer and exchange of Ag out onto the surface. At 300 K, coverages of Co > 1 ML gives rise to a 3D nanocluster growth on the surface, with the clusters covered by Ag. Depending slightly on coverage, the clusters have a typical diameter of 3 nm and a height of 0.4 nm. Upon annealing to 500 K, major changes are observed in the morphology of the surface. STM and AES show that there is a reduction of the number of Co islands on the surface, partly due to subsurface Co cluster migration and partly due to sintering into larger clusters. |
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Keywords: | Scanning tunneling microscopy Surface segregation Surface structure morphology roughness and topography Metal– metal nonmagnetic heterostructures Metal– metal interfaces |
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