Inversion of growth speed anisotropy in two dimensions

Michely, Thomas; Hohage, M.; Bott, Michael; Comşa, George

doi:10.1103/physrevlett.70.3943

Cited by 327 publications

(189 citation statements)

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“…The (111) surface of FCC metals is particularly interesting due to the observation of fractal as well as two (2D) or three (3D) dimensional compact adislands depending on the temperature [5,6,19]. Actually, the adisland morphology and its evolution with temperature result from a competition between thermodynamics and kinetic phenomena depending on the activation (or not) of various diffusion processes.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion rates of Cu adatoms on Cu(111) in the presence of an adisland nucleated at fcc or hcp sites

et al. 2005

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The surface diffusion of Cu adatoms in the presence of an adisland at FCC or HCP sites on Cu(111) is studied using the EAM potential derived by Mishin et al. [Phys. Rev. B 63 224106 (2001)]. The diffusion rates along straight (with close-packed edges) steps with (100) and (111)-type microfacets (resp. step A and step B) are first investigated using the transition state theory in the harmonic approximation. It is found that the classical limit beyond which the diffusion rates follow

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Section: Introductionmentioning

confidence: 99%

“…A large number of theoretical and experimental works has been devoted to homoepitaxial growth, e.g., on Pt [3,4,5,6,7], Cu [8,9,10], Ag [11,12], Rh [13,14,15], Al [16,17,18]... In this respect, the understanding of adisland shapes is of fundamental importance since they can indirectly influence the growth mode.…”

Section: Introductionmentioning

confidence: 99%

Diffusion rates of Cu adatoms on Cu(111) in the presence of an adisland nucleated at fcc or hcp sites

et al. 2005

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“…In a seminal scanning-tunneling-microscopy (STM) study of homoepitaxial growth of Pt (1 11), Michely and coworkers [6] observed several beautiful transitions in surface morphology upon increasing the substrate temperature T. Focusing on compact island shapes, triangular islands bounded by A-steps at 400 K were observed to become inverted at 640 K, bounded by B-steps (see Fig. 1 for clarification of step types).…”

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confidence: 99%

“…Density-functional calculations for A1/Al(ll 1) by Stumpf and Scheffler [71indeed do show anisotropic edge diffusion, with barriers for diffusion along A-and B-steps of 0.32 and 0.39-0.42 eV, respectively. With the additional (and vaguely motivated) assumption of a 100 times larger prefactor for edge diffusion along B-steps, the shape transition, experiment ally observed for Pt/Pt(111) [6], could be qualitatively reproduced in kinetic Monte Carlo (KMC) simulations of Al(lll) growth [8].…”

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Origin of Compact Triangular Islands in Metal-on-Metal Growth

1999

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The microscopic origin of compact triangular islands on close-packed surfaces is identified using kinetic Monte Carlo simulations with energy barriers obtained from density-functional calculations. In contrast to earlier accounts, corner diffusion anisotropy is found to control the shape of compac$ĩ slands at intermediate temperatures.-CEIVEE We rationalize the correlation between the orientation 6P L dendrites grown at low temperatures and triangular islands grown at higher temperatures, and explain why in some systems dendrites grow fat before turning compact. 66~30.Fq, 68.35.Fx, Epitaxial growth of metals is governed by a handful of elementary atomic diffusion processes, where motion of atoms along and across clusters of adsorbed atoms is inherently different from diffusion on plain terraces [1,2]. In particular, sites of low coordination and symmetry do not only always influence growth, but very often directly control it [3]. For example, diffusion processes at kinks and corners define the shape of atomic aggregates [3], the mechanism by which these migrate across the surface [3,4], and the very growth mode itself [5]. Here low-symmetry diffusion processes are shown to have additional important roles, and three outstanding morphology issues in epit axial growth are resolved. JUL 2 \ t$lgIn a seminal scanning-tunneling-microscopy (STM) study of homoepitaxial growth of Pt (1 11), Michely and coworkers [6] observed several beautiful transitions in surface morphology upon increasing the substrate temperature T. Focusing on compact island shapes, triangular islands bounded by A-steps at 400 K were observed to become inverted at 640 K, bounded by B-steps (see Fig. 1 for clarification of step types). A simple explanation fon triangular islands was proposed by Michely et at. [6]: growing islands should advance faster perpendicular to steps with lower adatom mobility. Accordingly, islands would tend to become triangular, with the faster growing steps disappearing. The shape transition from A-to Bstep-bounded islands was attributed to a cross-over in the rate for diffusion of atoms along the two types of steps. Specifically, an anisotropy in both activation barriers and prefactors for edge diffusion was proposed to induce a cross-over in the relative growth speed of these steps, inverting the triangular islands. Density-functional calculations for A1/Al(ll 1) by Stumpf and Scheffler [71indeed do show anisotropic edge diffusion, with barriers for diffusion along A-and B-steps of 0.32 and 0.39-0.42 eV, respectively. With the additional (and vaguely motivated) assumption of a 100 times larger prefactor for edge diffusion along B-steps, the shape transition, experiment ally observed for Pt/Pt (111) [6], could be qualitatively reproduced in kinetic Monte Carlo (KMC) simulations of Al(lll) growth [8].By resealing semi-empirically calculated energy barriers for Pt/Pt(111), Jacobsen and coworkers [9] have been able to find a parameter set that reproduces the experimentally observed transitions, but with the governing aniso...

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Self‐Organized Clusters and Nanosize Islands on Metal Surfaces

Bucher

Scheurer

2001

Magnetism: Molecules to Materials III

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Inversion of growth speed anisotropy in two dimensions

Cited by 327 publications

References 13 publications

Diffusion rates of Cu adatoms on Cu(111) in the presence of an adisland nucleated at fcc or hcp sites

Diffusion rates of Cu adatoms on Cu(111) in the presence of an adisland nucleated at fcc or hcp sites

Origin of Compact Triangular Islands in Metal-on-Metal Growth

Self‐Organized Clusters and Nanosize Islands on Metal Surfaces

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