Growth and structural characterization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and NiO thin film

Lind, D. M.; Berry, S.; Chern, G.; Mathias, H.; Testardi, L. R.

doi:10.1103/physrevb.45.1838

Cited by 212 publications

(41 citation statements)

References 20 publications

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“…Fe 3 O 4 (100) films were grown on MgO(100) substrates by MBE in oxygen [165,166]and NO 2 [167] atmospheres, several orientations of Fe 3 O 4 and α-Fe 2 O 3 films were grown on different surface planes of Al 2 O 3 and MgO substrates by oxygen-plasma-assisted MBE [168][169][170]. For studying the coupling between magnetic layers, Fe 3 O 4 /NiO [171] and Fe 3 O 4 /CoO [172] superlattices were grown by MBE.…”

Section: Preparation Of Ordered Metal-oxide Surfacesmentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

579

610

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Metal-oxide based catalysts are used for many important synthesis reactions in the chemical industry. A better understanding of the catalyst operation can be achieved by studying elemantary reaction steps on well-defined model catalyst systems. For the dehydrogenation of ethylbenzene to styrene in the presence of steam both unpromoted and potassium promoted iron-oxide catalysts are active. Here we review the work done over unpromoted single-crystalline FeO(111), Fe 3 O 4 (111) and α-Fe 2 O 3 (0001) films grown epitaxially on Pt(111) substrates. Their geometric and electronic surface structures were characterized by STM, LEED, electron microscopy and electron spectroscopic techniques. In an integrative approach, the interaction of water, ethylbenzene and styrene with these films was investigated mainly by thermal desorption and photoelectron emission spectroscopy. The adsorptiondesorption energetics and kinetics depend on the oxide surface terminations and are correlated to the electronic structures and acid-base properties of the corresponding oxide phases, which reveal insight into the nature of the active sites and into the catalytic function of semiconducting oxides in general. Catalytic studies, using a batch reactor arrangement at high gas pressures and post reaction surface analysis, showed that only α-Fe 2 O 3 (0001) containing surface defects is catalytically active, whereas Fe 3 O 4 (111) is always inactive. This can be related to the elementary adsorption and desorption properties observed in ultrahigh vacuum, which indicates that the surface chemical properties of the iron-oxide films do not change significantly across the "pressure-gap". A model is proposed according to which the active site involves a regular acidic surface sites and a defect site next to it. The results on metal-oxide surface chemistry also have implications for other fields, such as environmental science, biophysics and chemical sensors.-2 -"2kyEi9FYSQjBVrZxIPQ.FHIAC_WRa02_review.doc", Datum: 19.02.03

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Section: Preparation Of Ordered Metal-oxide Surfacesmentioning

confidence: 99%

Surface chemistry and catalysis on well-defined epitaxial iron-oxide layers

Weiß

Ranke

2002

Progress in Surface Science

579

610

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“…[19][20][21] However, lower temperatures than 250 C may lead to polycrystalline 22 and poorly ordered magnetite films. 23 During the preparation of MTJs, the material stacks are usually annealed to improve the crystalline quality of the barrier material and, therefore, increase the TMR. In case of MgO tunnel barriers adjacent to magnetite electrodes, the interdiffusion of the magnesium ions during annealing affects the magnitude and the sign of the TMR.…”

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confidence: 99%

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Schemme

Krampf

Bertram³

et al. 2015

Journal of Applied Physics

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Iron oxide films were reactively grown on iron buffer films, which were deposited before on MgO(001) substrates to analyze the influence of the initial iron buffer layers on the magnetic properties of the magnetite films. X-ray photoelectron spectroscopy and low energy electron diffraction showed that magnetite films of high crystalline quality in the surface near region were formed by this two-step deposition procedure. The underlying iron film, however, was completely oxidized as proved by x-ray reflectometry and diffraction. The structural bulk quality of the iron oxide film is poor compared to magnetite films directly grown on MgO(001). Although the iron film was completely oxidized, we found drastically modified magnetic properties for these films using the magnetooptic Kerr effect. The magnetite films had strongly increased coercive fields, and their magnetic in-plane anisotropy is in-plane rotated by 458 compared to magnetite films formed directly by one step reactive growth on MgO(001). V C 2015 AIP Publishing LLC.

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“…[8][9][10] This raises significant questions about the composition of insulating oxide barrier layers and the coupling of the ferromagnet at the barrier interface. Oxide magnetic/insulator superlattices consisting of Fe 3 O 4 /NiO, [11][12][13] and NiO/CoO 14 -16 have been fabricated but superexchanges appear to be suppressed in the insulating systems and the interlayer coupling is confined primarily to the interface region and therefore sensitive to interface morphology. [8][9][10] Because of the interest in both superconductor-insulating-ferromagnetic 4 and FM-I-FM 1-3 junctions, we have examined the reduction and oxidation reaction that accompanies the deposition of both a superconductor ͑Pb͒ and a transition metal ferromagnet ͑Co͒ on the stable Cr 2 O 3 insulating surface of CrO 2 .…”

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confidence: 99%