Publisher’s Note: Self-Limiting Size Distribution of Supported Cobalt Nanoclusters at Room Temperature [Phys. Rev. Lett.<b>90</b>, 185506 (2003)]

Gwo, Shangjr; Chou, Chung Pin; Wu, Chi Jung; Ye, Yi Jen; Tsai, Shu Ju; Lin, Wen Chin; Lin, Minn-Tsong

doi:10.1103/physrevlett.90.249901

Cited by 9 publications

(19 citation statements)

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“…16 This mechanism was recently used to explain the nucleation of Co nanodots on a Si 3 N 4 buffer layer. 7 This mechanism cannot be ruled out for the system studied here; however, as a clear dot-substrate interaction is present one would expect quantum confinement effects to be inhibited. Also, the existence of some variant cluster sizes suggests that sizes other than the dominant ones are energetically unfavorable, as opposed to forbidden by a magic rule.…”

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confidence: 87%

“…5,6 Dot arrays of magnetic materials are of added interest, offering the possibility of extremely high density magnetic data storage. [7][8][9][10] In this letter we present the growth of ordered, uniformly sized, 2D Fe dots on the ͑2 ϫ 1͒ reconstructed Ge͑001͒ surface and demonstrate current rectifying properties of the contact, using scanning tunneling spectroscopy ͑STS͒. Experiments were performed in a UHV system with a base pressure of 1 ϫ 10 −10 Torr.…”

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confidence: 99%

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Self-assembled Fe nanodots on Ge(001)

Jordan

Shvets

2006

Applied Physics Letters

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The initial nucleation of Fe onto the ͑2 ϫ 1͒ reconstructed Ge͑001͒ surface is studied. Uniformly sized two-dimensional Fe dots are shown to nucleate. They have an apparent corrugation height ϳ1.1 Å and lateral dimensions ϳ12ϫ 8 Å 2 . Further to their uniform size, due to their registry with respect to the substrate, they are shown to nucleate on a single equivalent surface site. It is suggested that their stability is due to either a "magic" number effect or adsorbate-substrate interactions. Tunneling I͑V͒ spectra show the dot/Ge͑001͒ contact to exhibit marked current rectifying behavior, which is extremely well confined to the contact area. © 2006 American Institute of Physics. ͓DOI: 10.1063/1.2201861͔ Fabrication of ordered, size selected, nanoscale wires and dots is an area of great interest. Due to their low dimensionality, they can exhibit quantum effects and may find use in future electronic and high density storage devices. Many methods have been put forward for the growth of such structures including pulsing scanning tunneling microscopy ͑STM͒ probes, 1 deposition of preformed clusters from the liquid or gas phase, 2 and thermal evaporation onto nanopatterned substrates, e.g., surfaces with strain relief patterns. 3,4 Substrates with well defined surface reconstructions have also been studied, such as the deposition of alkali metals onto the ͑7 ϫ 7͒ reconstructed Si͑111͒ surface, to form socalled ͑2D͒ "magic" dots. 5,6 Dot arrays of magnetic materials are of added interest, offering the possibility of extremely high density magnetic data storage. [7][8][9][10] In this letter we present the growth of ordered, uniformly sized, 2D Fe dots on the ͑2 ϫ 1͒ reconstructed Ge͑001͒ surface and demonstrate current rectifying properties of the contact, using scanning tunneling spectroscopy ͑STS͒. Experiments were performed in a UHV system with a base pressure of 1 ϫ 10 −10 Torr. Samples were cut from a 2 in., Sb-doped ͑0.05 ⍀ cm͒, Ge wafer. Fe was evaporated from an ultrapure rod, using an e-beam evaporator. Depositions were performed at room temperature. Nominal film thickness was measured using a quartz crystal balance. Auger electron spectroscopy ͑AES͒ was employed routinely to ensure surface cleanliness. STM was performed, at room temperature, using a home built instrument with an Omicron SCALA controller.Ge͑001͒ samples were outgassed at 800 K for 24 h in UHV. The surface was then subjected to repeated cycles of Ar + ion etching and UHV annealing, at temperatures in the 850-950 K range. 11,12 AES shows a contaminant-free surface and the well known ͑2 ϫ 1͒ low energy electron diffraction ͑LEED͒ mesh is observed ͓Fig. 1͑a͔͒. STM images large terraces with Ge dimer rows oriented along the ͓110͔ direction, in agreement with earlier studies. 11,12 The dimer row direction rotates by 90°from one terrace to the next. The dimer formation results in the ͑2 ϫ 1͒ reconstruction, with a 4 Å periodicity along the dimer rows and an 8 Å periodicity across, as shown schematically in Fig. 1͑b͒. At room temperature the Ge dime...

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confidence: 87%

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confidence: 99%

Self-assembled Fe nanodots on Ge(001)

Jordan

Shvets

2006

Applied Physics Letters

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“…Three recent studies have reported self-limiting size distributions of Co clusters on Si 3 N 4 , Al 2 O 3 / NiAl͑100͒ and 6H-SiC͑0001͒ templates. 1, 22,23 Figure 1͑e͒ also reveals some clusters on the terraces although 75± 3% of them remain at the terrace edges. This surface was further annealed at 550°C for 5 min.…”

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confidence: 89%

Terrace width dependence of cobalt silicide nucleation on Si(111)-(7×7)

Zilani

Wang

et al. 2006

Applied Physics Letters

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“…In some heteroepitaxial systems the deposited atoms selfassemble into nanoparticles ͑or islands͒ with quite narrow distribution of their sizes [1][2][3][4][5] in contrast to the broad distributions usually observed both at the early stages of growth 6 as well as during the late stage ripening. 7,8 The phenomenon of size calibration ͑SC͒ attracted much attention recently because of its potentially rich technological applications in such fields as microelectronics 9,10 and catalysis.…”

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confidence: 99%

Size calibration of self-assembled nanoparticles in a model of strained epitaxy with passive substrate

Tokar

2005

Phys. Rev. B

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We argue that a transient size calibration of self-assembled nanoparticles during strained epitaxy can be caused by forces interior to the growing islands without substrate-propagated interparticle interactions or intermixing with the substrate. The role of substrate in our mechanism is only to provide the intraparticle elastic strain. Our arguments are based on kinetic Monte Carlo simulations of the ͑1+1͒-dimensional model of strained epitaxy of Ratsch and Zangwill ͑RZ͒ ͓Surf. Sci. 293, 123 ͑1993͔͒. It has been found that while the energetics of the RZ model predicts indefinite ripening of the islands, in the simulations their linear dimensions saturated at intermediate times near some finite coverage-dependent values. Simultaneously statistical distributions of their widths and heights narrowed, thus providing improved size calibration. The size distributions obtained are qualitatively similar to those observed experimentally in the growth of ultrasmall supported metallic clusters. The applicability of the model to such systems is briefly discussed.

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Publisher’s Note: Self-Limiting Size Distribution of Supported Cobalt Nanoclusters at Room Temperature [Phys. Rev. Lett.90, 185506 (2003)]

Cited by 9 publications

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Self-assembled Fe nanodots on Ge(001)

Self-assembled Fe nanodots on Ge(001)

Terrace width dependence of cobalt silicide nucleation on Si(111)-(7×7)

Size calibration of self-assembled nanoparticles in a model of strained epitaxy with passive substrate

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