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  Size-Selected Epitaxial Nanoislands Underneath Graphene Moiré on Rh(111)

Sicot, M., Leicht, P., Zusan, A., Bouvron, S., Zander, O., Weser, M., et al. (2012). Size-Selected Epitaxial Nanoislands Underneath Graphene Moiré on Rh(111). ACS nano, 6(1), 151-158. doi:10.1021/nn203169j.

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Sicot_ACS_Nano_resubmission.pdf (Any fulltext), 27B
 
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 Creators:
Sicot, Muriel1, Author
Leicht, Philipp1, Author
Zusan, Andreas1, Author
Bouvron, Samuel1, Author
Zander, Ole1, Author
Weser, Martin2, Author           
Dedkov, Yuriy2, Author           
Horn, Karsten2, Author           
Fonin, Mikhail1, Author
Affiliations:
1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany, ou_persistent22              
2Molecular Physics, Fritz Haber Institute, Max Planck Society, ou_634545              

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Free keywords: graphene; moiré; rhodium; ferromagnet; intercalation; scanning tunneling microscopy; photoemission spectroscopy
 Abstract: We use in situ scanning tunneling microscopy (STM) to investigate intercalation of the ferromagnetic 3d metals Ni and Fe underneath a graphene monolayer on Rh(111). Upon thermal annealing of graphene/Rh(111) with the deposited metal on top, we observe the formation of epitaxial monatomic nanoislands grown pseudomorphically on Rh(111) and covered by graphene. The size and shape of intercalated nanoislands is strongly influenced by the local spatial variation of the graphene–Rh bonding strength. In particular, the side length of the intercalated nanoislands shows maxima around discrete values imposed by the periodicity of the graphene moiré. Intercalation can be performed efficiently and without any visible damage of the graphene overlayer in the studied temperature range between 670 and 870 K. We identify the main intercalation path to be via diffusion through pre-existing lattice defects in graphene, accompanied by the second mechanism which is based on the material diffusion via metal-generated defects followed by the defect healing of the graphene lattice. We deem these graphene-capped and sharply confined ferromagnetic nanoislands interesting in the fields of spintronics and nanomagnetism.

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Language(s): eng - English
 Dates: 2012-01-032012-01-24
 Publication Status: Published in print
 Pages: 8
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/nn203169j
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Title: ACS nano
Source Genre: Journal
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Pages: - Volume / Issue: 6 (1) Sequence Number: - Start / End Page: 151 - 158 Identifier: -