Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

Fournée, V.; Ledieu, J.; Cai, T.; Thiel, Patricia A.

doi:10.1103/physrevb.67.155401

Cited by 24 publications

(18 citation statements)

References 29 publications

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“…31͒ but 3D on Al͑111͒. 32 There is evidence of alloying at very low Ag coverage on the latter two surfaces but overall the results are consistent with the DFT calculations and also with the simple rule-of-thumb.…”

Section: A 2d Vs 3d Growthsupporting

confidence: 80%

Variation of growth morphology with chemical composition of terraces: Ag on a twofold surface of a decagonal Al-Cu-Co quasicrystal

et al. 2010

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Growth of Ag thin films on the twofold surface of a decagonal Al-Cu-Co quasicrystal is characterized by scanning tunneling microscopy, at different temperatures, and for coverages ranging from submonolayer to 11 monolayers. From prior work, three types of clean surface terraces are known to exist. By correlation with a bulk structural model, the major difference between them lies in their transition-metal (TM) content, two being aluminum-rich (0 and 15 at. % TM) and one being TM-rich (40-50 at. % TM). The present article focuses on understanding the difference between Ag film morphologies on these terminations, in terms of their chemical content. Growth is found to be smoother on the TM-rich terraces and rougher on the Al-rich ones. The first Ag atomic layer is even pseudomorphic on the TM-rich terraces. Roughness variation with temperature shows that the equilibrium morphology is two dimensional for TM-rich terraces and three dimensional for Al-rich terraces. The explanation of different growth modes in terms of different terrace compositions is supported by calculations of the adhesion energy of a Ag slab with Ag, Al, Cu, and Co slabs, using density-functional theory. For the Al-rich terraces, the roughness variation with temperature also indicates reentrant growth, i.e., anomalously smooth growth at low temperature due to kinetic effects. Growth of Ag thin films on the twofold surface of a decagonal Al-Cu-Co quasicrystal is characterized by scanning tunneling microscopy, at different temperatures, and for coverages ranging from submonolayer to 11 monolayers. From prior work, three types of clean surface terraces are known to exist. By correlation with a bulk structural model, the major difference between them lies in their transition-metal ͑TM͒ content, two being aluminum-rich ͑0 and 15 at. % TM͒ and one being TM-rich ͑40-50 at. % TM͒. The present article focuses on understanding the difference between Ag film morphologies on these terminations, in terms of their chemical content. Growth is found to be smoother on the TM-rich terraces and rougher on the Al-rich ones. The first Ag atomic layer is even pseudomorphic on the TM-rich terraces. Roughness variation with temperature shows that the equilibrium morphology is two dimensional for TM-rich terraces and three dimensional for Al-rich terraces. The explanation of different growth modes in terms of different terrace compositions is supported by calculations of the adhesion energy of a Ag slab with Ag, Al, Cu, and Co slabs, using density-functional theory. For the Al-rich terraces, the roughness variation with temperature also indicates reentrant growth, i.e., anomalously smooth growth at low temperature due to kinetic effects.

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Section: A 2d Vs 3d Growthsupporting

confidence: 80%

Variation of growth morphology with chemical composition of terraces: Ag on a twofold surface of a decagonal Al-Cu-Co quasicrystal

et al. 2010

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“…We reported earlier a study of Ag thin films grown on the same surface at room temperature [21]. At 300 K, islands nucleate by capture of Ag adatoms at specific quasilattice trap sites and then start growing vertically, appearing as ''needles'' which are up to 4 and 5 atoms high at 1 ML coverage, implying an easy uphill motion of the Ag adatoms.…”

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confidence: 93%

Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

et al. 2005

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“…Alloying occurs in some systems, but only at temperatures of ϳ500 K or above. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] While Ag can insert into surface planes of pure Al substrates, 32 Ag is not known to react with surfaces of alloys containing Al and earlier transition metals such as Ni or Pd at room temperature. 33,34 Presumably, this is because the Al-Ni bond is much stronger than the Al-Ag or Ni-Ag bond, as reflected in the thermody-namic data for the respective alloys.…”

Section: Introductionmentioning

confidence: 99%

Scanning tunneling microscopy and density functional theory study of initial bilayer growth of Ag films on NiAl(110)

et al. 2007

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Scanning tunneling microscopy (STM) studies of the deposition of Ag on bcc NiAl(110) in the temperature range from 200 to 300 K reveal an initial bilayer growth mode. In this regime, which encompasses at least the first two levels of bilayer islands, the film appears to have an fcc Ag(110)-like structure. Selection of this structure reflects an almost perfect lateral match between the Ag(110) and NiAl(110) lattice constants. Density functional theory (DFT) analysis of supported Ag films with an ideal fcc(110) structure on NiAl(110) indicates that the bilayer growth mode is promoted by a quantum size effect. However, the system does not exhibit perfect Ag(110) film growth. STM analysis reveals that the tops of Ag islands are decorated by a ripple structure even in the initial levels of growth and also shows a deviation from Ag(110)-like bilayer growth to Ag(111)-like monolayer growth for thick films. DFT analysis is also applied to provide some insight into the observed deviations from perfect Ag(110) film structure.

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Influence of strain in Ag on Al(111) and Al on Ag(100) thin film growth

Cited by 24 publications

References 29 publications

Variation of growth morphology with chemical composition of terraces: Ag on a twofold surface of a decagonal Al-Cu-Co quasicrystal

Variation of growth morphology with chemical composition of terraces: Ag on a twofold surface of a decagonal Al-Cu-Co quasicrystal

Quantum Size Effects in Metal Thin Films Grown on Quasicrystalline Substrates

Scanning tunneling microscopy and density functional theory study of initial bilayer growth of Ag films on NiAl(110)

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