Periodic surface modulation on thin epitaxial FeSi2 layers on Si(001)

Hajjar, S.; Garreau, G.; Pelletier, S.; Bertoncini, Patricia; Wetzel, P.; Gewinner, G.; Imhoff, M.; Pirri, Candido Fabrizio

doi:10.1016/s0039-6028(03)00142-0

Cited by 17 publications

(15 citation statements)

References 13 publications

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“…1, where observed One of the typical silicides which has been studied [5,6] is the c(2×2) island. It was observed at θ F e = 2 and 4 ML and T a ≥≈500 • C (region A in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…STM results have been reported for many studies of silicides grown by SPE on Si(111), but in restricted preparation conditions, and recently, progress has been made in establishing a schematic phase diagram [4]. For silicides on Si(001) there are few STM works [5][6][7] which have reported in very restricted conditions, and there is no detailed phase diagram, even though works using averaged structure analysis [8,9] have suggested rough phase diagrams.…”

Section: Introductionmentioning

confidence: 99%

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Variety of iron silicides grown on Si(001) surfaces by solid phase epitaxy: Schematic phase diagram

et al. 2007

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“…1, where observed One of the typical silicides which has been studied [5,6] is the c(2×2) island. It was observed at θ F e = 2 and 4 ML and T a ≥≈500 • C (region A in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variety of iron silicides grown on Si(001) surfaces by solid phase epitaxy: Schematic phase diagram

et al. 2007

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“…It was reported that the β-FeSi 2 [010] Si 110 surface is terminated by c(2 × 2)-like [21] or p(2 × 2) reconstructions [21,24]. SPE-grown two-dimensional iron-silicide islands on Si(001) were observed with scanning tunneling microscopy (STM) [11,25,26]. Iron-silicide islands terminated by c(2 × 2)-like protrusions were surrounded by Si(001)-(2 × 1) dimers.…”

Section: Introductionmentioning

confidence: 99%

Surface structure and electronic states of epitaxialβ−FeSi2(100)/Si(001) thin films: Combined quantitative LEED,ab initioDFT, and STM study

et al. 2014

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The surface structure of epitaxial β-FeSi 2 (100) thin film grown on Si(001) was analyzed using the quantitative low-energy electron diffraction intensity-voltage (LEED I-V) method, ab initio density functional theory (DFT) calculations, and scanning tunneling microscopy (STM). LEED patterns measured on the β-FeSi 2 (100) surface reveal two domains of a p(2 × 2) reconstruction with p2gg diffraction symmetry. The iron-silicide film truncation and atomic surface structure were determined by LEED I-V method: The smallest Pendry's reliability factor R P = 0.22 ± 0.02 was achieved for the bare β-FeSi 2 film truncated by an Si layer, whereas Si and Fe ad-atom structures were excluded. Significant atomic relaxations within the topmost surface layers were revealed by the LEED I-V method and confirmed by DFT. The simulated STM patterns from the best-fit model agree well with the measured STM images on the β-FeSi 2 (100)/Si(001)-p(2 × 2) surface: Four Si atoms on a surface form one bright protrusion on STM patterns. Electronic band structure analysis of the bulk and epitaxial β-FeSi 2 (100) was carried out. A bare truncated epitaxial film was found to be metallic. Surface electronic states were identified by a partial k-resolved atomic-orbital based local density-of-state analysis.

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“…It was observed in Refs. 19,22,30,38, and 69 during the deposition of Fe films up to the thickness of 200 Å ͑Ref. 43͒ and interpreted as resulting from a low free energy of the Si surface.…”

Section: A Solid-phase Synthesis Of Iron Silicidesmentioning

confidence: 99%

“…50,51 The interaction between Fe atoms and Si produces a number of stable ͓Fe 3 Si, 6,21,26,27,45 -FeSi, [5][6][7]9,12,20,21,25,45 and ␤-FeSi 2 ͑Refs. 5-7, 9, 12, 20, 21, 25, and 45͔͒ and metastable silicides ͑FeSi with the CsCl-type of structure, 9,18,20,21,25,27,29,40,45 ␥-FeSi 2 with the CaF 2 structure, [5][6][7]10,11,16,18,29,40,44 ␣-FeSi 2 at temperatures below 920°C, 16,17,19,24,38,45 etc.͒. The formation of metastable silicides is due to the fact that their lattice mismatch with the Si substrate is much smaller than that for stable silicides.…”

Section: Introductionmentioning

confidence: 99%

Magnetic ordering of the Fe/Si interface and its initial formation

Pronin

Gomoyunova

Malygin

et al. 2008

Journal of Applied Physics

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High-resolution photoelectron spectroscopy with synchrotron radiation and magnetic linear dichroism in Fe 3p core-level photoemission has been used to study both the initial stages of Fe/Si(111)7×7 and Fe/Si(100)2×1 interface formation and their ferromagnetic ordering. The correlation between the phase composition, electronic structure, and magnetic behavior of the interfaces has been established. It is shown that in-plane ferromagnetic ordering of the interfaces has a threshold nature and arises after the deposition of ∼7 Å Fe in both systems. However, the remanent magnetization of Fe/Si(111) is greater than that of Fe/Si(100) due to the difference in the chemistry of the phases being formed. In the former case, it was found that at room temperature an ultrathin metastable FeSi film with the CsCl structure grows at the first stage of Fe deposition on Si. At higher Fe coverages, a Si solid solution in iron, and later an Fe film, is found to develop on FeSi. The magnetic properties of the solid solution and the Fe film of ∼15 Å thick are quite similar. At the Fe/Si(100) interface, we observe the formation of iron-rich Fe3Si, in which the average magnetic moment of Fe atoms is markedly lower than that of the Fe film. Solid-phase reactions, starting at ∼100 °C in both systems, lead to a gradual conversion of ferromagnetic phases to the nonmagnetic ε-FeSi phase, which transforms to β-FeSi2 at temperatures above 600 °C.

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Periodic surface modulation on thin epitaxial FeSi2 layers on Si(001)

Cited by 17 publications

References 13 publications

Variety of iron silicides grown on Si(001) surfaces by solid phase epitaxy: Schematic phase diagram

Variety of iron silicides grown on Si(001) surfaces by solid phase epitaxy: Schematic phase diagram

Surface structure and electronic states of epitaxialβ−FeSi2(100)/Si(001) thin films: Combined quantitative LEED,ab initioDFT, and STM study

Magnetic ordering of the Fe/Si interface and its initial formation

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