Unusual Strain Relaxation in Cu Thin Films on Ni(001)

Rasmussen, F.B.; Baker, Jenifer M.; Nielsen, M.; Feidenhans’l, R.; Johnson, Robert L.

doi:10.1103/physrevlett.79.4413

Cited by 20 publications

(8 citation statements)

References 9 publications

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“…10,11 By increasing the number of Cu overlayers, this protrusive stripe grew in width forming ͕111͖ internal facets in the Cu film, in agreement with Auger-electron diffraction ͑AED͒, 12 x-ray photoelectron diffraction ͑XPD͒, [13][14][15] and surface x-ray diffraction. 16 For these studies, there was no indication of intermixing or roughening at the interface between the Ni substrate and Cu overlayers, therefore, the Ni͑001͒ substrate was assumed to be intact even after Ni overlayer formation. For the Cu/Ni͑111͒ surface, the perturbed ␥␥ angular correlation ͑PAC͒ of 111 In ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

Mixed layer formation on the copper-deposited Ni(110) surface

et al. 2008

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We studied initial Cu overlayer formation on the Ni͑110͒ surface by scanning tunneling microscopy ͑STM͒ in an ultrahigh vacuum. Initially, deposited Cu displaces the top Ni layer, forming two-dimensional Cu-Ni alloy on the substrate. The Cu atom embedded into the top layer was depressed in the STM image. The depression due to the lack of Ni 3d-derived surface local density of states was confirmed by the first-principles calculation. Ni atoms squeezed out from the top substrate layer agglomerated in the anisotropic Ni island along the close-packed ͓110͔ direction. Further Cu deposition resulted in a Cu-Ni mixed island. Quantitative measurement of the Cu fraction on the substrate showed that 0.71Ϯ 0.04 of deposited Cu was embedded in the top Ni layer, whereas significant Cu enrichment was seen on the island.

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Section: Introductionmentioning

confidence: 99%

Mixed layer formation on the copper-deposited Ni(110) surface

et al. 2008

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“…These studies confirm the internal faceting model for copper on Ni(100) and give a detailed insight into the relaxation behavior of the copper film. Rasmussen et al [117][118][119] have proved not only the occurrence of internal {111} facets but also the shift of the stripe atoms by half a nearest neighbor distance. Their measurement of the constant stripe height (0.05 nm) agrees well with the STM and spot profile analysis of low energy electron diffraction 116 as well as with the hard sphere model.…”

Section: Concurring Model For Misfit Accommodation: Inclined Stackingmentioning

confidence: 99%

“…Their measurement of the constant stripe height (0.05 nm) agrees well with the STM and spot profile analysis of low energy electron diffraction 116 as well as with the hard sphere model. 114 Since synchrotron Xray diffraction also yields information about deeper film layers, Rasmussen et al 118,119 were able to detect the suggested lateral relaxation of the copper atoms within the stripe as well as the formation of pseudomorphic copper in between. Furthermore, the vertical lattice spacing of copper in the wedges as well as between them can be extracted using an appropriate model.…”

Section: Concurring Model For Misfit Accommodation: Inclined Stackingmentioning

confidence: 99%

“…118 Away from the interface the relaxation becomes smaller and smaller, so that for coverages of about 20 monolayers the topmost layer shows the lattice constant of bulk nickel, although usually the copper film should tend to its natural spacing. In that way the strain relaxation of copper on Ni (100) is unusual.…”

Section: Concurring Model For Misfit Accommodation: Inclined Stackingmentioning

confidence: 99%

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Natural Formation of Nanostructures: From Fundamentals in Metal Heteroepitaxy to Applications in Optics and Biomaterials Science

Müller

2001

Surf. Rev. Lett.

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The tailoring of nanostructures by the use of vapor deposition techniques opens up new opportunities to engineer innovative materials and devices in different fields, including optoelectronics and biomaterials. This review elucidates recent advances in the understanding of heteroepitaxy exemplifying the growth of copper on Ni(100) and the growth of para-hexaphenyl on GaAs. Although copper on nickel belongs to the simplest systems, unprecedented morphologies arise, such as ramified islands on a square lattice and strain relief by internal faceting. The elongated para-hexaphenyl crystallites formed on GaAs(001) exhibit a polarized blue light emission, which is a basis for developing organic diode lasers. Anisotropic thin film morphologies are also realized by oblique incidence deposition of noncentrosymmetric organic molecules onto amorphous substrates. Using the frequency doubling of light, it has been demonstrated for the first time that the films not only are anisotropic but also exhibit a preferential orientation of the molecules. Germanium nanopyramids epitaxially grown on Si(001) provide evidence that a well-defined nanopatterned substrate alters the contact angles of water, the protein adsorption and activity, as well as the cell behavior. These results are a milestone in structural biocompatibility on the nanometer scale. Surf. Rev. Lett. 2001.08:169-228. Downloaded from www.worldscientific.com by MONASH UNIVERSITY on 12/08/14. For personal use only.

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“…Following the development of Ge hut clusters on Si(100) (Mo et al, 1990), several types of islands have been observed in different systems (Legoues et al, 1994;Leonard et al, 1993 andRasmussen et al, 1997). For better device performance of quantum-dot structures, the objective now is to obtain islands of the same size, shape and strain-state, and to find a mechanism for self-organized ordering (Tersoff et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Grazing incidence small-angle X-ray scattering from laterally ordered triangular pyramidal Ge islands on Si(111)

Paniago¹,

Metzger²,

Rauscher³

et al. 2000

J Appl Cryst

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We present a structural study of nearly perfect triangular pyramidal Ge islands grown on Boron-terminated Si(111). Using atomic force microscopy we show that these islands are strongly ordered in the direction perpendicular to the miscut induced terrace steps of the substrate. We use grazing incidence small-angle X-ray scattering to assess the island shape and size distribution. In this geometry the scattered wave amplitude is composed of four terms, including all combinations of scattering from the islands and reflection from the substrate. We finally show that this technique is able to determine the complete symmetry of arbitrary shaped objects on a substrate.

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Unusual Strain Relaxation in Cu Thin Films on Ni(001)

Cited by 20 publications

References 9 publications

Mixed layer formation on the copper-deposited Ni(110) surface

Mixed layer formation on the copper-deposited Ni(110) surface

Natural Formation of Nanostructures: From Fundamentals in Metal Heteroepitaxy to Applications in Optics and Biomaterials Science

Grazing incidence small-angle X-ray scattering from laterally ordered triangular pyramidal Ge islands on Si(111)

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