Pinning of size-selected Co clusters on highly ordered pyrolytic graphite

Sasa Vuckovic, Juha Samela, Kai Nordlund, Vladimir Popok

Research output: Contribution to journalJournal articleResearchpeer-review

8 Citations (Scopus)

Abstract

Deposition and implantation of size-selected Co50±5 cluster ions on/in highly ordered pyrolytic graphite (HOPG) have been performed. Cobalt clusters were produced by laser ablation using the second harmonic (532 nm) of a Nd:YAG laser. They were deposited/implanted with energies of 250–4850 eV/cluster and examined using scanning tunneling microscopy (STM). For the highest energies the clusters created craters and wells with residual clusters at the bottom of the wells. Decrease of the impact energy led to formation of bumps which consist of damaged graphite areas mixed with fragmented cobalt clusters. Further decrease of the impact energy to 250–450 eV/cluster probably corresponds to the so-called pinning regime, when the impacting cluster creates defects in the surface layer and becomes bound to them. The transition from implantation to pinning with a decrease of impact energy was confirmed by
etching experiments showing the depth of the damage introduced by the cluster collisions with HOPG.
Original languageEnglish
JournalThe European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Volume52
Pages (from-to)107-110
Number of pages4
ISSN1434-6060
DOIs
Publication statusPublished - 6 Mar 2009
Externally publishedYes

Fingerprint

pyrolytic graphite
implantation
cobalt
energy
craters
laser ablation
YAG lasers
scanning tunneling microscopy
surface layers
graphite
damage
harmonics
collisions
defects

Keywords

  • Structure of clusters
  • Ion radiation effects
  • Scanning tunneling microscopy
  • Theory of impact phenomena; numerical simulation

Cite this

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title = "Pinning of size-selected Co clusters on highly ordered pyrolytic graphite",
abstract = "Deposition and implantation of size-selected Co50±5 cluster ions on/in highly ordered pyrolytic graphite (HOPG) have been performed. Cobalt clusters were produced by laser ablation using the second harmonic (532 nm) of a Nd:YAG laser. They were deposited/implanted with energies of 250–4850 eV/cluster and examined using scanning tunneling microscopy (STM). For the highest energies the clusters created craters and wells with residual clusters at the bottom of the wells. Decrease of the impact energy led to formation of bumps which consist of damaged graphite areas mixed with fragmented cobalt clusters. Further decrease of the impact energy to 250–450 eV/cluster probably corresponds to the so-called pinning regime, when the impacting cluster creates defects in the surface layer and becomes bound to them. The transition from implantation to pinning with a decrease of impact energy was confirmed byetching experiments showing the depth of the damage introduced by the cluster collisions with HOPG.",
keywords = "Structure of clusters, Ion radiation effects, Scanning tunneling microscopy, Theory of impact phenomena; numerical simulation",
author = "Sasa Vuckovic and Juha Samela and Kai Nordlund and Vladimir Popok",
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journal = "The European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics",
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Pinning of size-selected Co clusters on highly ordered pyrolytic graphite. / Vuckovic, Sasa; Samela, Juha; Nordlund, Kai; Popok, Vladimir.

In: The European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics, Vol. 52, 06.03.2009, p. 107-110.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Pinning of size-selected Co clusters on highly ordered pyrolytic graphite

AU - Vuckovic, Sasa

AU - Samela, Juha

AU - Nordlund, Kai

AU - Popok, Vladimir

PY - 2009/3/6

Y1 - 2009/3/6

N2 - Deposition and implantation of size-selected Co50±5 cluster ions on/in highly ordered pyrolytic graphite (HOPG) have been performed. Cobalt clusters were produced by laser ablation using the second harmonic (532 nm) of a Nd:YAG laser. They were deposited/implanted with energies of 250–4850 eV/cluster and examined using scanning tunneling microscopy (STM). For the highest energies the clusters created craters and wells with residual clusters at the bottom of the wells. Decrease of the impact energy led to formation of bumps which consist of damaged graphite areas mixed with fragmented cobalt clusters. Further decrease of the impact energy to 250–450 eV/cluster probably corresponds to the so-called pinning regime, when the impacting cluster creates defects in the surface layer and becomes bound to them. The transition from implantation to pinning with a decrease of impact energy was confirmed byetching experiments showing the depth of the damage introduced by the cluster collisions with HOPG.

AB - Deposition and implantation of size-selected Co50±5 cluster ions on/in highly ordered pyrolytic graphite (HOPG) have been performed. Cobalt clusters were produced by laser ablation using the second harmonic (532 nm) of a Nd:YAG laser. They were deposited/implanted with energies of 250–4850 eV/cluster and examined using scanning tunneling microscopy (STM). For the highest energies the clusters created craters and wells with residual clusters at the bottom of the wells. Decrease of the impact energy led to formation of bumps which consist of damaged graphite areas mixed with fragmented cobalt clusters. Further decrease of the impact energy to 250–450 eV/cluster probably corresponds to the so-called pinning regime, when the impacting cluster creates defects in the surface layer and becomes bound to them. The transition from implantation to pinning with a decrease of impact energy was confirmed byetching experiments showing the depth of the damage introduced by the cluster collisions with HOPG.

KW - Structure of clusters

KW - Ion radiation effects

KW - Scanning tunneling microscopy

KW - Theory of impact phenomena; numerical simulation

U2 - 10.1140/epjd/e2009-00065-1

DO - 10.1140/epjd/e2009-00065-1

M3 - Journal article

VL - 52

SP - 107

EP - 110

JO - The European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics

JF - The European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics

SN - 1434-6060

ER -