Temporal step fluctuations on a conductor surface: electromigration force, surface resistivity and low-frequency noise

Williams, Ellen D.; Bondarchuk, Oleksandr; Chen, Tao; Yan, W.; Cullen, William; Rous, P.J.; Bole, T.

doi:10.1088/1367-2630/9/10/387

Cited by 13 publications

(3 citation statements)

References 83 publications

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“…For the ACA thin films, the signature of this time dependence will be a noise component with frequency dependence f !1/ 2 (46,47), with the largest frequency limited by the underlying molecular exchange times τ a . For the edge boundaries of ACA, the upper limit of the frequency contribution will thus be in the range of 30-100Hz.…”

Section: Discussionmentioning

confidence: 99%

Dynamic interfaces in an organic thin film

Chen¹,

Liu²,

Riddick³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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Low-dimensional boundaries between phases and domains in organic thin films are important in charge transport and recombination. Here, fluctuations of interfacial boundaries in an organic thin film, acridine-9-carboxylic acid (ACA) on Ag(111), have been visualized in real time, and measured quantitatively, using Scanning Tunneling Microscopy. The boundaries fluctuate via molecular exchange with exchange time constants of 10-30 ms at room temperature, yielding length mode fluctuations that should yield characteristic f-1/2 signatures for frequencies less than ~100 Hz. Although ACA has highly anisotropic intermolecular interactions, it forms islands that are compact in shape with crystallographically distinct boundaries that have essentially identical thermodynamic and kinetic properties . The physical basis of the modified symmetry is shown to arise from significantly different substrate interactions induced by alternating orientations of successive molecules in the condensed phase. Incorporating this additional set of interactions in a lattice gas model leads to effective multi-component behavior, as in the Blume-Emery-Griffiths (BEG) model, and can straightforwardly reproduce the experimentally observed isotropic behavior. The general multi-component description allows the domain shapes and boundary fluctuations to be tuned from isotropic to highly anisotropic in terms of the balance between intermolecular interactions and molecule-substrate interactions. Key words: Organic thin film, fluctuations, STM, molecular interactions, diffusion kinetics, phase coexistenceComment: 32 pages, 7 figure

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Section: Discussionmentioning

confidence: 99%

Dynamic interfaces in an organic thin film

Chen¹,

Liu²,

Riddick³

et al. 2008

Proc. Natl. Acad. Sci. U.S.A.

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“…Furthermore, since we generically expect w ⊥ ∼ h, the dependence on the particle size must be weak. Using typical orders of magnitudeF c ∼ 1, Z = 10 to 20 [25][26][27], ρ ∼ 10 −8 to 10 −7 m −1 , and γ 100 ∼ 0.1 eVÅ −2 , we find that for the largest electric currents usually available in STM or AFM are I ∼ 1 μA [28,29], F /F c ∼ 10 −1 − 10 −2 . Hence, the observation of transitions would require higher electric currents, at least 10 μA to reach the threshold.…”

Section: Discussionmentioning

confidence: 82%

Controlling the wetting transitions of nanoparticles on nanopatterned substrates using an electric current

Ignacio

Pierre-Louis

2015

Phys. Rev. E

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We study the behavior of a nanoparticle under electromigration on a nanopatterned surface. We show that electromigration allows one to control the wetting transitions of the nanoparticle. Suitable surface electromigration conditions to observe these transitions can be achieved with electric currents larger than 1 μA. Using kinetic Monte Carlo simulations and analytical modeling, we determine the phase diagram of the wetting states, showing how wetting multistability is affected by electromigration. In addition, we show that the dynamics of the transitions is controlled by surface diffusion in our simulations, and we provide a quantitative expression for the transition time.

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“…So far, a very limited number of publications are available investigating EM down to the atomic scale, e.g. using scanning tunnelling microscopy [9][10][11][12] or other microscopic techniques [13,14]. For a micrometre length scale only a few in situ experiments have been performed [15][16][17], i.e.…”

Section: Introductionmentioning

confidence: 99%

Current induced surface diffusion on a single-crystalline silver nanowire

Kaspers¹,

Bernhart²,

Bobisch³

et al. 2012

Nanotechnology

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Scanning tunnelling microscopy was used to study the morphological changes of the surface of a single-crystalline silver nanowire caused by a lateral electron current. At current densities of about 1.5 × 10(7) A cm(-2), surface atoms are extracted from step edges, resulting in the motion of surface steps, islands and holes with a thickness or depth of one monolayer. Upon current reversal the direction of the material transport can be altered. The findings are interpreted in terms of the wind force.

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Temporal step fluctuations on a conductor surface: electromigration force, surface resistivity and low-frequency noise

Cited by 13 publications

References 83 publications

Dynamic interfaces in an organic thin film

Dynamic interfaces in an organic thin film

Controlling the wetting transitions of nanoparticles on nanopatterned substrates using an electric current

Current induced surface diffusion on a single-crystalline silver nanowire

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