Magnetic-dichroism study of iron silicides formed at the Fe/Si(100) interface

Pronin, I. I.; Gomoyunova, M. V.; Malygin, D. E.; Vyalikh, D. V.; Dedkov, Yuriy; Молодцов, С. Л.

doi:10.1007/s00339-008-4910-7

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…This conclusion agrees well with the results from [9][10][11]. The spectrum recorded after the deposition of iron also agrees with the data reported in [12,13]. Apart from the bulk component, this spectrum has new components induced by the formation of interfacial silicide FeSi (mode I, binding energy of 99.57 eV), sili cide Fe 3 Si (mode C, 98.92 eV), and silicon segregated onto its surface (mode S, 98.65 eV).…”

Section: Resultssupporting

confidence: 95%

“…It should also be noted that components A and S of the spectrum disappear after this annealing, which indicates the disappearance of a cobalt film on the sample surface. Note that the sili cide formation in this system in the temperature range under study proceeds according to the scenario that takes place in the binary Fe/Si(100) system [13]. Thus, this process is localized in the region of reactivity of the Fe/Si interface, and cobalt existing in the system only weakly affects this process.…”

Section: Resultsmentioning

confidence: 95%

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Silicide formation in bilayer ultrathin iron and cobalt films on silicon

2014

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The processes that occur in ultrathin (up to 1 nm) Fe and Co layers during deposition onto the Si(100)2 × 1 surface in various sequences and during annealing of the formed structures to a temperature of 400°C are studied. The elemental and chemical compositions of the films are analyzed by in situ high reso lution X ray photoelectron spectroscopy using synchrotron radiation, and their magnetic properties are determined using the magnetic linear dichroism effect in the angular distribution of Fe 3p and Co 3p elec trons. It is shown that, when iron is first deposited, the formed structure consists of the layers of FeSi, Fe 3 Si, Co-Si solid solution, and metallic cobalt with segregated silicon. The structure formed in the alternative case consists of the layers of CoSi, Co-Si solid solution, Co, Fe-Si solid solution, and Fe partly covered by sili con. All layers (apart from FeSi, CoSi) form general magnetic systems characterized by ferromagnetic order ing. Annealing of the structures at temperatures above 130°C (for the Co/Fe/Si system) and ~200°C (for Fe/Co/Si) leads to the formation of nonmagnetic binary and ternary silicides (Fe x Co 1 -x Si, Fe x Co 2 -x Si).

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Section: Resultssupporting

confidence: 95%

Section: Resultsmentioning

confidence: 95%

Silicide formation in bilayer ultrathin iron and cobalt films on silicon

2014

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“…Each Fe site provides six 3p states, the configuration of which depends, inter alia, on spin‐orbit coupling and spin polarization (see Figure S7, Supporting Information). [ 14–16 ] Thus, the chemical shift of 3p states results from charge redistribution caused by the rearrangement of chemical bonds (reduction of iron oxide). [ 14 ]…”

Section: Resultsmentioning

confidence: 99%

Ostwald Ripening in an Oxide‐on‐Metal System

Michalak

Ossowski

Miłosz

et al. 2022

Adv Materials Inter

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for performing fundamental studies on "inverse" catalysts, [3] as they resemble many structural features of real catalysts, such as oxide species of different size and stoichiometry, low-coordinated transition metal atoms (present at the perimeter of oxide islands and within internal defects), as well as exposed noble metal support regions.Depending on the application, it may be desirable to maximize the number of specific structural features within an oxide-on-metal system, such as certain crystal facets, edge sites, defects or exposed substrate regions. [4] This is usually done by optimizing the oxide's growth method. However, the structure of the system may also evolve under varying environmental conditions, for example, in response to high pressures of gases or elevated temperatures. In this respect, controlling the structure of metal-on-metal and metal-on-oxide systems, and predicting their behavior in different environments, is much more trivial, as the mechanisms governing the growth and structural evolution of metals under oxidizing and reducing conditions are wellunderstood. For example, thermal treatments under reducing conditions are known to lead to supported metal particles sintering and, thus, the change in the ratio between the facet and edge sites. The process usually proceeds through one of the two mechanisms: coalescence, [5] that is, Brownian-like motion of particles and their merging upon collision, or Ostwald Ostwald ripening is a well-known physicochemical phenomenon in which smaller particles, characterized by high surface energy, dissolve and feed the bigger ones that are thermodynamically more stable. The effect is commonly observed in solid and liquid solutions, as well as in systems consisting of supported metal clusters or liquid droplets. Here, evidence is provided for the occurrence of Ostwald ripening in an oxide-on-metal system which, in this case, consists of ultrathin iron monoxide (FeO) islands grown on Ru(0001) single-crystal support. The results reveal that the thermally-driven sintering of islands allows altering their fine structural characteristics, including size, perimeter length, defect density and stoichiometry, which are crucial, for example, from the point of view of heterogeneous catalysis.

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“…41,42 Ordered iron silicides, including Fe 3 Si, are known to form on silicon substrates when a thin Fe layer is deposited on a Si(100) surface. 43,44 Si segregation in Fe-Si alloys has been observed, which can result in ordered Fe 3 Si or FeSi at the surface. 45 DFT-GGA calculations also predicted Si segregation to Fe 3 Si surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Iron silicides have a wide range of potential applications due to a diverse set of unusual properties: optical properties of FeSi 2 conducive to thin-film electronic devices, high hardness and corrosion resistance of Fe 3 Si, and giant magnetoresistance exhibited in Fe 3 Si/FeSi multilayers. , Ordered iron silicides, including Fe 3 Si, are known to form on silicon substrates when a thin Fe layer is deposited on a Si(100) surface. , Si segregation in Fe−Si alloys has been observed, which can result in ordered Fe 3 Si or FeSi at the surface . DFT-GGA calculations also predicted Si segregation to Fe 3 Si surfaces .…”

Section: Introductionmentioning

confidence: 99%

First Principles Assessment of Carbon Absorption into FeAl and Fe₃Si: Toward Prevention of Cementite Formation and Metal Dusting of Steels

Johnson¹,

Carter²

2010

J. Phys. Chem. C

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We assess two alloys, FeAl and Fe3Si, in terms of their ability to inhibit ingress of carbon into steels using periodic density functional theory to model alloy thin films. Absorption of carbon into Fe3Si via its (100) and (110) surfaces is predicted to be considerably more endothermic compared to absorption into FeAl or pure Fe. Predicted energy barriers for surface to subsurface diffusion are ∼1 eV or larger for all four surfaces studied. A very endothermic dissolution enthalpy (1.65 eV) and large diffusion activation energies (e.g., 1.29 eV) suggest Fe3Si should inhibit carbon uptake into bulk steel and slow bulk diffusion. Combined with the results of other recent work [Johnson, D. F.; Carter, E. A. Acta Mater. 2010, 58, 638], we expect that a protective coating of Fe3Si should be effective at preventing steel degradation by hydrogen and carbon containing gases.

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Magnetic-dichroism study of iron silicides formed at the Fe/Si(100) interface

Cited by 8 publications

References 30 publications

Silicide formation in bilayer ultrathin iron and cobalt films on silicon

Silicide formation in bilayer ultrathin iron and cobalt films on silicon

Ostwald Ripening in an Oxide‐on‐Metal System

First Principles Assessment of Carbon Absorption into FeAl and Fe₃Si: Toward Prevention of Cementite Formation and Metal Dusting of Steels

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Magnetic-dichroism study of iron silicides formed at the Fe/Si(100) interface

Cited by 8 publications

References 30 publications

Silicide formation in bilayer ultrathin iron and cobalt films on silicon

Silicide formation in bilayer ultrathin iron and cobalt films on silicon

Ostwald Ripening in an Oxide‐on‐Metal System

First Principles Assessment of Carbon Absorption into FeAl and Fe3Si: Toward Prevention of Cementite Formation and Metal Dusting of Steels

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First Principles Assessment of Carbon Absorption into FeAl and Fe₃Si: Toward Prevention of Cementite Formation and Metal Dusting of Steels