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Kim, H.-J.; Park, J.-H.; Vescovo, E.

doi:10.1103/physrevb.61.15284

Cited by 87 publications

(67 citation statements)

References 9 publications

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“…The growth of the shoulder peak at 707.8 is similar, indicative of an increase in the Fe þ2 state in the octahedral coordination (B-site). 12,13 This means that as the Ga substitutes into the spinel structure, it is not displacing the Fe 2þ in the octahedral configuration so that the relative percentage of iron in this configuration is increasing. Given that the Ga XAS spectra is consistent with Ga in a 3þ valence (and in a tetrahedral coordination) and the Fe XAS data evidence that the iron is not removed from the octahedral 2þ coordination, the gallium appears to preferentially substitute into the tetrahedral Fe 3þ A-site.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced magnetism of Fe3O4 nanoparticles with Ga doping

Pool¹,

Klem²,

Chorney³

et al. 2011

Journal of Applied Physics

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Magnetic (Ga x Fe 1Àx ) 3 O 4 nanoparticles with 5%-33% gallium doping (x ¼ 0.05-0.33) were measured using x-ray absorption spectroscopy and x-ray magnetic circular dichroism to determine that the Ga dopant is substituting for Fe 3þ as Ga 3þ in the tetrahedral A-site of the spinel structure, resulting in an overall increase in the total moment of the material. Frequency-dependent alternating-current magnetic susceptibility measurements showed these particles to be weakly interacting with a reduction of the cubic anisotropy energy term with Ga concentration. The element-specific dichroism spectra show that the average Fe moment is observed to increase with Ga concentration, a result consistent with the replacement of A-site Fe by Ga.

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Section: Resultsmentioning

confidence: 99%

“…2, the spectra for 0% gallium looks as expected for pure Fe 3 O 4 . 12 The primary peak at 709.25 dominates and the pre-edge is appropriately small. As the amount of gallium increases the shoulder peak at 707.8 grows with respect to the primary peak.…”

Section: Resultsmentioning

confidence: 99%

Enhanced magnetism of Fe3O4 nanoparticles with Ga doping

Pool¹,

Klem²,

Chorney³

et al. 2011

Journal of Applied Physics

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“…Studies performed on polycrystalline [4] as well as on single crystalline [5] surfaces have shown that the oxidation of iron can be understood in the framework of the coupled current mechanism introduced by Fromhold and Cook more than 50 years ago [6]. While those experiments explain very well the observed growth kinetics, the actual composition of the native oxide is still a matter of debate and is obviously highly dependent on preparation parameters like temperature and surface orientation ( [7][8][9][10][11] and references therein). X-ray absorption spectroscopy at the L edges was recently used to characterize the extent of oxidation or reduction processes arising at the interface between Fe and other transition metal oxides (CoO and NiO) [12].…”

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confidence: 99%

“…The sensitivity of the XAS signal to the oxidation state and the local environment of the absorbing atom is used to follow the evolution of the oxide's structure in a quantitative and site specific manner. The use of ultrathin layers (in contrast to other studies which used thick substrates [4,5,[7][8][9]) allows one to directly resolve the intrinsic composition of the growing oxide and disentangle the influence of the substrate.The experiment was performed in situ in a compact UHV deposition chamber (base pressure 1 10 ÿ9 mbar) mounted on the A1 beam line of the DORIS III storage ring (DESY, Hamburg). The Fe K-edge absorption signal was recorded by measure of the total electron yield and fluorescence yield.…”

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confidence: 99%

How Metallic Fe Controls the Composition of its Native Oxide

et al. 2008

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We have studied in situ the oxidation of ultrathin iron layers and monitored the chemical changes induced by subsequent deposition of Fe metal using hard x-ray absorption spectroscopy. The site sensitivity of the technique allows us to quantify the composition of the layer throughout the oxidation or deposition process. It is found that the thin native oxide incorporates a significant fraction of Fe atoms remaining in a metallic configuration even in the saturated state. Subsequent deposition of Fe leads to a complete reduction of the oxide that adopts an FeO-like structure containing Fe 2 sites only. DOI: 10.1103/PhysRevLett.101.056101 PACS numbers: 81.15.ÿz, 61.05.cj, 81.16.Pr In recent years, intensive research has been conducted on transition metal oxide compounds, thin films, and multilayers due to their potential use as building blocks in magnetic structures like spin valves and magnetic tunnel junctions (for a review, see [1] and references therein). Recently, metal -native-oxide multilayers (MNOM, produced by metal deposition and subsequent oxygen exposure) have been proposed as new compounds combining high magnetization and low conductivity [2]. In these systems, the buried oxide possesses magnetic properties that strongly deviate from any bulk iron oxide phase [2,3]. However, the influence of the surrounding metal on the structure of the oxide is not yet identified and prevents clear understanding of the observed magnetic properties of MNOM systems.The oxidation of iron itself has been extensively studied in the past decades. Studies performed on polycrystalline [4] as well as on single crystalline [5] surfaces have shown that the oxidation of iron can be understood in the framework of the coupled current mechanism introduced by Fromhold and Cook more than 50 years ago [6]. While those experiments explain very well the observed growth kinetics, the actual composition of the native oxide is still a matter of debate and is obviously highly dependent on preparation parameters like temperature and surface orientation ([7-11] and references therein). X-ray absorption spectroscopy at the L edges was recently used to characterize the extent of oxidation or reduction processes arising at the interface between Fe and other transition metal oxides (CoO and NiO) [12]. Remarkably, the interaction of Fe with its own oxide phases was never quantitatively studied before.In this Letter, we present a quantitative x-ray absorption spectroscopy (XAS) study of the oxidation of ultrathin iron layers and the changes induced by subsequent coverage with Fe. The sensitivity of the XAS signal to the oxidation state and the local environment of the absorbing atom is used to follow the evolution of the oxide's structure in a quantitative and site specific manner. The use of ultrathin layers (in contrast to other studies which used thick substrates [4,5,[7][8][9]) allows one to directly resolve the intrinsic composition of the growing oxide and disentangle the influence of the substrate.The experiment was performed in situ in...

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“…4 highlight the anisotropy of the hybridization between orbitals. First resonant feature is larger in width compared to the pure metal L-edge spectra 53 but π* and σ* antibonding states are not seen…”

Section: Discussionmentioning

confidence: 99%

Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

et al. 2013

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The electronic properties of the FeO and CoO single layer thin films on Pt(111) were examined by core level soft X-ray spectroscopy. These oxygen terminated films are bilayer-thick and isostructural, Pt, Fe-Co, and O atoms stacked with small lateral shifts due to incommensurate relation with Pt(111). Probing occupied and unoccupied states projected on the oxygen atoms revealed states at the Fermi level suggesting orbital mixing with the metal substrate and also indicated an anisotropy in transition metal-oxygen bonding geometry. The differences in the core level spectral features were attributed to the substrate induced modification of the charge transfer energy and with an additional valence electron on Co.

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Oxidation of the Fe(110) surface: AnFe3O4(111)/F

Cited by 87 publications

References 9 publications

Enhanced magnetism of Fe3O4 nanoparticles with Ga doping

Enhanced magnetism of Fe3O4 nanoparticles with Ga doping

How Metallic Fe Controls the Composition of its Native Oxide

Identification of the electronic structure differences between polar isostructural FeO and CoO films by core-level soft x-ray spectroscopy

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