|Title||Dy uniform film morphologies on graphene studied with SPA-LEED and STM|
|Publication Type||Journal Article|
|Year of Publication||2016|
|Authors||McDougall, D, Hattab, H, Hershberger, MT, Hupalo, M, von Hoegen, MH, Thiel, PA, Tringides, MC|
|Type of Article||Article|
|Keywords||chemistry, contacts, growth-morphology, Materials Science, metals, surfaces|
The use of graphene for microelectronics and spintronic applications requires strategies for metals to wet graphene and to grow layer-by-layer. This is especially important when metals will be used as electrical contacts or as spin filters. Extensive work in the literature so far has shown that this is very challenging, since practically all metals grow 3D, with multi-height islands forming easily. Reasons for the 3D morphology are the much weaker metal carbon bond when compared to the metal cohesive energy and the role of Coulomb repulsion of the poorly screened charges at the metal graphene interface. We employed the complementary techniques of SPA-LEED and STM to study the growth of Dy on graphene. It was found that under kinetic limitations it is possible to fully cover graphene with a bilayer Dy film, by growing well below room temperature in stepwise deposition experiments. The Dy film, however, is amorphous but ways to crystallize it within the 2D morphology are possible, since long range order improves at higher growth temperature. Published by Elsevier Ltd.
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