Controllable growth of α‐ and β‐FeSi<sub>2</sub> thin films on Si(100) by facing‐target sputtering

Pan, Shanshan; Ye, C.; Teng, X. M.; Fan, Hong-Tao; Li, G. H.

doi:10.1002/pssa.200622438

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…This process is explained based on the established literature of gold-silicon chemistry: Gold and silicon have a relatively low eutectic temperature; at higher temperature, the iron-gold mixture remains as a liquid eutectic alloy. It is reasonable to expect To the best of our knowledge, no complete experimental XRD spectrum of β-FeSi 2 nanoparticles has been presented in the literature (26,(62)(63)(64)(65)(66)(67)(68)(69)(70). When the sample is annealed at 800 °C with triethylsilane, the (023), ( 440), ( 006), (262), and (535) atomic reflections disappear (Figure 7b ii).…”

Section: Resultsmentioning

confidence: 99%

“…However, only 11−12 XRD reflections of β-FeSi 2 are observed on silicon (111) substrate (either from core-shell or alloy nanoparticles). To the best of our knowledge, no complete experimental XRD spectrum of β-FeSi 2 nanoparticles has been presented in the literature ,− . When the sample is annealed at 800 °C with triethylsilane, the (023), (440), (006), (262), and (535) atomic reflections disappear (Figure b ii).…”

Section: Resultsmentioning

confidence: 99%

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Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Dahal

Wright

Willey

et al. 2010

ACS Appl. Mater. Interfaces

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This study describes a strategy to use composite colloidal nanoparticles and triethylsilane as precursors to synthesize nanometer size structures on single-crystal silicon substrate. The concept is demonstrated by depositing gold, iron-gold alloy, and iron-gold core-shell nanoparticles on silicon (111). Upon heating, the nanoparticles form new crystalline phases on the Si (111) surface. Atomic force microscope (AFM) data show the collapse of the iron gold core-shell and alloy nanoparticles at temperatures 100-200 degrees C higher than gold nanoparticles, indicating the efficient tethering of iron containing nanoparticles on silicon (111). Both structural analysis and X-ray spectroscopy show that the iron-gold alloy and iron-gold core-shell nanoparticles successfully form the semiconducting beta-FeSi(2) phase at relatively low temperature. The stabilities of the silicide are assessed at elevated temperatures. Silicon successfully nucleates on the created nanostructures, which suggests strong catalytic activity towards producing further nanostructures on the surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Dahal

Wright

Willey

et al. 2010

ACS Appl. Mater. Interfaces

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“…During cooling, the high temperature stable α-FeSi 2 phase transforms into the β-FeSi 2 phase in terms of an energy-lowering Jahn-Teller-like distortion, accompanied by a spontaneous metal-semiconductor transition [10][11][12]. Although the impure α phase (nonmagnetic) can only be occasionally obtained via facing-target sputtering [13], ion implantation [14], and the annealing of a few monolayer films of Fe on Si(111) [15,16] and Si(001) [17,18] substrates, it already shows interesting applications as electrodes or an interconnecting material, precursors for achieving Si-β heterostructures [15,19]. Physically, the magnetic properties of metastable phases can be drastically different from those of equilibrium phases [20,21].…”

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confidence: 99%

Ferromagnetism and Nonmetallic Transport of Thin-Filmα−FeSi2: A Stabilized Metastable Material

et al. 2015

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A metastable phase α-FeSi_{2} was epitaxially stabilized on a silicon substrate using pulsed laser deposition. Nonmetallic and ferromagnetic behaviors are tailored on α-FeSi_{2} (111) thin films, while the bulk material of α-FeSi_{2} is metallic and nonmagnetic. The transport property of the films renders two different conducting states with a strong crossover at 50 K, which is accompanied by the onset of a ferromagnetic transition as well as a substantial magnetoresistance. These experimental results are discussed in terms of the unusual electronic structure of α-FeSi_{2} obtained within density functional calculations and Boltzmann transport calculations with and without strain. Our finding sheds light on achieving ferromagnetic semiconductors through both their structure and doping tailoring, and provides an example of a tailored material with rich functionalities for both basic research and practical applications.

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“…In Refs. [12], [16]- [19] a successful fabrication of thin films α−F eSi 2 was reported. Also, while the magnetic order is not observed in bulk stoichiometric disilicide α − F eSi 2 , ferromagnetism was found [19] in the metastable phase α − F eSi 2 , which was stabilized in epitaxial-film grown on the silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent mapping: Effect of local environment on formation of magnetic moment in α−FeSi2

et al. 2017

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The Hohenberg-Kohn theorem establishes a basis for mapping of the exact energy functional to a model one provided that their charge densities coincide. We suggest here to use a mapping in a similar spirit: the parameters of the formulated multiorbital model should be determined from the requirement that the self-consistent charge and spin densities found from the ab initio and model calculations have to be as close to each other as possible. The analysis of the model allows for detailed understanding of the role played by different parameters of the model in the physics of interest. After finding the areas of interest in the phase diagram of the model we return to the ab initio calculations and check if the effects discovered are confirmed or not. Because of the last controlling step we call this approach as hybrid self-consistent mapping approach (HSCMA). As an example of the approach we present the study of the effect of silicon atoms substitution by the iron atoms and vice versa on the magnetic properties in the iron silicide α − F eSi2. The DFT+GGA calculations are mapped to the model with intraatomic Coulomb and exchange interactions, hoppings to nearest and next nearest atoms and exchange of the delocalized electrons between iron atoms; the magnetic moments on atoms and charge densities of the material are found self-consistently within the Hartree-Fock approximation.We find that while the stoichiometric α − F eSi2 is nonmagnetic, the substitutions generate different magnetic structures. For example, the substitution of three Si atoms by the F e atoms results in the ferrimagnetic structure whereas the substitution of four Si atoms by F e atoms gives rise to either the nonmagnetic or the ferromagnetic state depending on the type of local enviroment of the substitutional F e atoms. Besides, contrary to the commonly accepted statement that the destruction of the magnetic moment is controlled only by the number of F e − Si nearest neighbors, we find that actually it is controlled by the F e − F e next-nearest-neighbors' hopping parameter. This finding led us to the counterintuitive conclusion: an increase of Si concentration in F e1−xSi2+x ordered alloys may lead to a ferromagnetism. This conclusion is confirmed by the calculation within GGA-to-DFT.

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Controllable growth of α‐ and β‐FeSi₂ thin films on Si(100) by facing‐target sputtering

Cited by 8 publications

References 25 publications

Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Ferromagnetism and Nonmetallic Transport of Thin-Filmα−FeSi2: A Stabilized Metastable Material

Self-consistent mapping: Effect of local environment on formation of magnetic moment in α−FeSi2

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Controllable growth of α‐ and β‐FeSi2 thin films on Si(100) by facing‐target sputtering

Cited by 8 publications

References 25 publications

Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Preparation of Iron and Gold Silicide Nanodomains on Silicon (111) by the Reaction of Gold, Iron−Gold Core−Shell, and Alloy Nanoparticles with Triethylsilane

Ferromagnetism and Nonmetallic Transport of Thin-Filmα−FeSi2: A Stabilized Metastable Material

Self-consistent mapping: Effect of local environment on formation of magnetic moment in α−FeSi2

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Controllable growth of α‐ and β‐FeSi₂ thin films on Si(100) by facing‐target sputtering