Direct epitaxial growth of subsurfaces Co nanoclusters

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Abstract

A new subsurface growth mode in the Co-Cu system is reported. This mode provides a direct subsurface growth of Co nanoclusters by depositing Co atoms on the Cu(001) surface in a single stage. The resulting subsurface Co nanoclusters are located 2 monolayers (ML) deep below the atomically flat surface of Cu(001). Although these hidden nanoclusters cannot be directly accessed by a scanning tunneling microscopy/spectroscopy (STM/STS) probe, their shape could be deduced using STM/STS via a careful analysis of the local deformation of the Cu(001) surface as well as local variations of surface electron density induced by the subsurface clusters. A strongly asymmetric shape of the nanoclusters is deduced: they are typically 5-10 nm in lateral size but only 2 to 3 ML in thickness. The thickness of the nanoclusters does not evolve significantly under a heat treatment. A simple model is implemented to describe the growth kinetics. The results in this study reveal that intense processes of diffusion, nucleation, and growth take place in a region 1 nm deep, thus defining the near-surface region.
LanguageEnglish
Article number165419
Pages165419-1/9
Number of pages9
JournalPhysical Review B
Volume90
Issue number16
DOIs
StatePublished - 15 Oct 2014

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Nanoclusters
nanoclusters
Epitaxial growth
Scanning tunneling microscopy
scanning tunneling microscopy
Monolayers
Spectroscopy
Growth kinetics
spectroscopy
Carrier concentration
flat surfaces
Nucleation
heat treatment
Heat treatment
nucleation
Atoms
probes
kinetics
atoms

Cite this

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title = "Direct epitaxial growth of subsurfaces Co nanoclusters",
abstract = "A new subsurface growth mode in the Co-Cu system is reported. This mode provides a direct subsurface growth of Co nanoclusters by depositing Co atoms on the Cu(001) surface in a single stage. The resulting subsurface Co nanoclusters are located 2 monolayers (ML) deep below the atomically flat surface of Cu(001). Although these hidden nanoclusters cannot be directly accessed by a scanning tunneling microscopy/spectroscopy (STM/STS) probe, their shape could be deduced using STM/STS via a careful analysis of the local deformation of the Cu(001) surface as well as local variations of surface electron density induced by the subsurface clusters. A strongly asymmetric shape of the nanoclusters is deduced: they are typically 5-10 nm in lateral size but only 2 to 3 ML in thickness. The thickness of the nanoclusters does not evolve significantly under a heat treatment. A simple model is implemented to describe the growth kinetics. The results in this study reveal that intense processes of diffusion, nucleation, and growth take place in a region 1 nm deep, thus defining the near-surface region.",
author = "T. Siahaan and O. Kurnosikov and H.J.M. Swagten and B. Koopmans",
year = "2014",
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doi = "10.1103/PhysRevB.90.165419",
language = "English",
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pages = "165419--1/9",
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Direct epitaxial growth of subsurfaces Co nanoclusters. / Siahaan, T.; Kurnosikov, O.; Swagten, H.J.M.; Koopmans, B.

In: Physical Review B, Vol. 90, No. 16, 165419, 15.10.2014, p. 165419-1/9.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Direct epitaxial growth of subsurfaces Co nanoclusters

AU - Siahaan,T.

AU - Kurnosikov,O.

AU - Swagten,H.J.M.

AU - Koopmans,B.

PY - 2014/10/15

Y1 - 2014/10/15

N2 - A new subsurface growth mode in the Co-Cu system is reported. This mode provides a direct subsurface growth of Co nanoclusters by depositing Co atoms on the Cu(001) surface in a single stage. The resulting subsurface Co nanoclusters are located 2 monolayers (ML) deep below the atomically flat surface of Cu(001). Although these hidden nanoclusters cannot be directly accessed by a scanning tunneling microscopy/spectroscopy (STM/STS) probe, their shape could be deduced using STM/STS via a careful analysis of the local deformation of the Cu(001) surface as well as local variations of surface electron density induced by the subsurface clusters. A strongly asymmetric shape of the nanoclusters is deduced: they are typically 5-10 nm in lateral size but only 2 to 3 ML in thickness. The thickness of the nanoclusters does not evolve significantly under a heat treatment. A simple model is implemented to describe the growth kinetics. The results in this study reveal that intense processes of diffusion, nucleation, and growth take place in a region 1 nm deep, thus defining the near-surface region.

AB - A new subsurface growth mode in the Co-Cu system is reported. This mode provides a direct subsurface growth of Co nanoclusters by depositing Co atoms on the Cu(001) surface in a single stage. The resulting subsurface Co nanoclusters are located 2 monolayers (ML) deep below the atomically flat surface of Cu(001). Although these hidden nanoclusters cannot be directly accessed by a scanning tunneling microscopy/spectroscopy (STM/STS) probe, their shape could be deduced using STM/STS via a careful analysis of the local deformation of the Cu(001) surface as well as local variations of surface electron density induced by the subsurface clusters. A strongly asymmetric shape of the nanoclusters is deduced: they are typically 5-10 nm in lateral size but only 2 to 3 ML in thickness. The thickness of the nanoclusters does not evolve significantly under a heat treatment. A simple model is implemented to describe the growth kinetics. The results in this study reveal that intense processes of diffusion, nucleation, and growth take place in a region 1 nm deep, thus defining the near-surface region.

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DO - 10.1103/PhysRevB.90.165419

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