Diffusion processes relevant to the epitaxial growth of Ag on Ag(110)

Hontinfinde, F.; Ferrando, Riccardo; Levi, A.C.

doi:10.1016/0039-6028(96)00820-5

Cited by 56 publications

(29 citation statements)

References 46 publications

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“…MD simulations using many-body tight-binding potentials indicate that the low activation barriers for both the Ag atom as well as the vacancy diffusion along ͓1 10͔ steps may account for the frizziness of the steps. 41 On the other hand, a recent STM investigation 54 of the Ag͑110͒ surface observed tip-assisted atom motion on Ag͑110͒ even for large tunneling resistances (R t ϭ4 G⍀) and, therefore, questions the previous interpretations of the frizziness of steps. Figure 7͑b͒ shows a representative STM picture for samples with 0.3-ML Au.…”

Section: Stm Experimentsmentioning

confidence: 92%

“…12,41 In order to accurately determine atomic distances in the inverted Ag/Au model proposed above ͓see Fig. 4͑c͔͒, calculations have been performed using the SSC formalism.…”

Section: B Xpd Experimentsmentioning

confidence: 99%

“…Indeed, a MD calculation simulating the vapor deposition of Ag on Ag͑110͒ shows that the anisotropic diffusion and sticking probabilities are responsible for the rectangular shape of the Ag islands observed in our experiment. 41 Since the original Ag͑110͒ surface does not exhibit holes, they are definitely the result of the Au deposition. The simul- FIG.…”

Section: Stm Experimentsmentioning

confidence: 99%

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Experimental evidence for kinetically determined intermixed Volmer-Weber growth in thin-film deposition of Au on Ag(110)

et al. 1999

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Au films, from the submonolayer range up to 11 ML, have been deposited in situ at 300 K. The geometrical structures of these films have been investigated combining full-hemispherical x-ray photoelectron diffraction, low-energy electron diffraction ͑LEED͒, low-energy ion-scattering spectroscopy, and scanning tunneling microscopy leading to an intermixed Volmer-Weber growth model. The results demonstrate that below 0.5 ML most Au atoms are buried within the second substrate layer, forming inverted Ag/Au areas on the surface. The ejected Ag atoms and vacancies created during the Au-Ag exchange nucleate into elongated two-dimensional Ag islands and vacancy clusters, respectively, quickly breaking up the surface into smaller terraces. Above about 0.5-ML coverage, the Au-Ag exchange mechanism continues to be active. In addition, due to the reduced mobility of Au atoms deposited on inverted Ag/Au areas, one-dimensional Au stripes as well as elongated three-dimensional ͑1ϫ3͒-symmetric Au islands are observed already at submonolayer coverages on inverted Ag/Au areas. Only after the deposition of more than 8-ML Au is the Ag substrate completely covered, and missing-row reconstructed terraces extend over regions large enough to yield a well-defined 1ϫ2 LEED pattern. The growth model is compared to both, published thermodynamic equilibrium predictions and molecular-dynamics simulations, revealing that the Au/Ag͑110͒ growth system is kinetically determined.

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Section: Stm Experimentsmentioning

confidence: 92%

“…12,41 In order to accurately determine atomic distances in the inverted Ag/Au model proposed above ͓see Fig. 4͑c͔͒, calculations have been performed using the SSC formalism.…”

Section: B Xpd Experimentsmentioning

confidence: 99%

Section: Stm Experimentsmentioning

confidence: 99%

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Experimental evidence for kinetically determined intermixed Volmer-Weber growth in thin-film deposition of Au on Ag(110)

et al. 1999

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“…Homo-and heteronuclear interlayer adatom transport at surface steps has been extensively investigated, both experimentally and theoretically, for metallic systems, including W/Ir(111) [17], Pb/Pb(111) [85], Pb/Cu(111) [18], Ag/Ag(110) [86], Pt/Pt(111) [19,87], and Au/Au(111) [88]. However, determination of descent pathways for ceramic materials such as TM nitrides is considerably more challenging due to the simultaneous presence of metal and nonmetal elements, which present a variety of bonding interactions (ionic, covalent, and metallic [55,89,90]) as well as surface morphology and N/TM stoichiometry that strongly depend on synthesis conditions [51,52,[91][92][93].…”

Section: Ti Adatom Descent From Tin/tin(001) Islandsmentioning

confidence: 99%

Effects of surface vibrations on interlayer mass transport: Ab initio molecular dynamics investigation of Ti adatom descent pathways and rates from TiN/TiN(001) islands

et al. 2018

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We carried out density-functional ab initio molecular dynamics (AIMD) simulations of Ti adatom (Ti ad ) migration on, and descent from, square TiN 100 epitaxial islands on TiN(001) at temperatures (T ) ranging from 1200 to 2400 K. Adatom-descent energy barriers determined via ab initio nudged-elastic-band calculations at 0 Kelvin suggest that Ti interlayer transport on TiN(001) occurs essentially exclusively via direct hopping onto a lower layer. However, AIMD simulations reveal comparable rates for Ti ad descent via direct hopping vs push-out/exchange with a Ti island-edge atom for T 1500 K. We demonstrate that this effect is due to surface vibrations, which yield considerably lower activation energies at finite temperatures by significantly modifying the adatom push-out/exchange reaction pathway.

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“…case of the ͑110͒ surfaces of fcc metals this leads to an ''easy'' in-channel diffusion along the ͗110͘ ͑x͒ direction and a ''difficult'' cross channel diffusion in the orthogonal ͗100͘ ͑y͒ direction. 16 The decay of such an island is inherently coupled to a mass flow from the island to the surrounding environment. Three successive atomic processes are involved: ͑i͒ the interface transfer of atoms at the island edge, i.e., detachment and attachment events, ͑ii͒ the adatom diffusion on the surface, and ͑iii͒ the incorporation of the adatoms into the environment at the outer boundary, i.e., at sinks.…”

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confidence: 99%

Decay characteristics of two-dimensional islands on strongly anisotropic surfaces

Yao

Ebert

et al. 2002

Phys. Rev. B

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We investigate analytically the decay characteristics of two-dimensional islands on strongly anisotropic surfaces. We show that a generic scaling law can always be established in describing the dynamical evolution of such islands, given by Lϰ(t 0 Ϫt) ␤ , where L is the island width, and t 0 is the lifetime of the islands. The value of the scaling exponent ␤ in the fast-decay direction is always 1/2 in the low-temperature regime where the decay is quasi-one-directional, irrespective of the specific dominant decaying mechanism involved. At higher temperatures where the decay proceeds effectively in both directions, ␤ is again a good measure of the dominant microscopic decaying mechanism involved, just like the isotropic case. We discuss these results in connection with recent experiments. There has been an overwhelming wealth of research activity on fabricating various nanostructures that may possess unique physical properties. Nevertheless, the stability of nanostructures, once formed, often poses a limiting factor for their practical applications. 1,2 Therefore, understanding the physical mechanisms involved in the stability and the dynamical evolution of nanostructures after their formation is both scientifically intriguing and technologically significant, and has been receiving increasing attention in recent years. One of the widely used model systems for such investigations is the decay of two-dimensional ͑2D͒ metal islands on metal substrates. [2][3][4][5][6][7][8][9][10][11] The thermal decay of such islands was found to reduce the island area with time t proportional to (t 0 Ϫt) 2␤ , where t 0 is the time at which the island is fully dissolved. 12 The value of the exponent ␤ is a signature of the dominant microscopic mechanism governing the rate of decay. In the case where attachment and detachment of atoms from the island edges dominate the rate of decay, ␤ equals 1/2 whereas for the diffusion-limited case, i.e., where diffusion of adatoms on the terrace limits the decay rate, ␤ is 1/3. These results very well describe the decay of islands on isotropic surfaces, which in fact has attracted most of the attention so far. However, the decay of islands on anisotropic substrates, i.e., surfaces with different energy barriers along the nonequivalent crystallographic directions, is expected to be more complex and may provide additional insight into the physical nature of island dissolution. Indeed the larger complexity was substantiated by the observation of a transition from a 2D decay mode at high temperatures to a quasi-onedimensional ͑1D͒ decay mode at low temperatures for the anisotropic system of Ag islands on Ag͑110͒. 11 Several more recent studies have also studied the evolution of islands and voids on other metal ͑110͒ surfaces, 13-15 but to date, the theoretical basis for description of island decay on anisotropic substrates is still lacking.In this paper we develop a comprehensive analytical description of the decay of two dimensional islands on highly anisotropic surfaces. We find that even for highl...

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Diffusion processes relevant to the epitaxial growth of Ag on Ag(110)

Cited by 56 publications

References 46 publications

Experimental evidence for kinetically determined intermixed Volmer-Weber growth in thin-film deposition of Au on Ag(110)

Experimental evidence for kinetically determined intermixed Volmer-Weber growth in thin-film deposition of Au on Ag(110)

Effects of surface vibrations on interlayer mass transport: Ab initio molecular dynamics investigation of Ti adatom descent pathways and rates from TiN/TiN(001) islands

Decay characteristics of two-dimensional islands on strongly anisotropic surfaces

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