Epitaxial growth of ultrathin Fe films on Ni(001): a structural study

Luches, Paola; Gazzadi, G. C.; Bona, A. di; Marassi, L; Pasquali, Luca; Valeri, Sergio; Nannarone, Stefano

doi:10.1016/s0039-6028(98)00792-4

Cited by 23 publications

(8 citation statements)

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“…In our previous study on the same system we concluded for intermixing. 15 In that case, best fit of Fe-to-Ni Auger intensity ratio occurred assuming an Fe/Ni intermixing extended over 3 layers and the ͓112͔ peak position in the Fe IAD's kept aligned with that of the Ni substrate up to 3 ML, as expected for Fe atoms embedded in a Ni matrix. In the present case, on the contrary, we notice that: ͑i͒ the ͓112͔ feature is shifted by Ϫ1.4°already at 1 ML and ͑ii͒ the Ni3p IAD's collected at low-Fe coverage ͑not shown here͒ do not show any appreciable angular shift of the main off-normal features.…”

Section: Pd Experimental Resultsmentioning

confidence: 55%

“…Similar results were found by Kuch and Parkin 14 in studying Fe/Ni multilayers by x-ray Diffraction and Superconducting Quantum Interference Device. In a recent work, 15 we have analyzed Fe/Ni͑001͒ films from the structural point of view, employing the primary-beam diffraction modulated electron emission ͑PDMEE͒ technique, 16 a powerful approach which provides quick qualitative analysis of thin films structure and it is easily feasible on most electron spectroscopy equipment. Fcc phase, tetragonally distorted along the growth direction, was observed up to 5 ML, followed by a transition to the bcc ͑110͒ phase which completed at 14 ML.…”

Section: Introductionmentioning

confidence: 99%

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Structural analysis of Fe/Ni(001) films by photoelectron diffraction

et al. 2000

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The structure of Fe films, epitaxially grown on Ni͑001͒, has been studied in the 0-14 ML coverage range by means of photoelectron diffraction ͑PD͒ in the forward scattering regime. Quantitative analysis by a multiple scattering approach has been performed on Fe films at a coverage of 3 and 7 ML. Analysis of the 3-ML data showed that growth was not layer-by-layer but rather occurred through islands nucleation and that transition from the pseudomorphic fcc to the bcc phase was located in this early stage of growth. In fact, best fit was obtained by calculations on a 2 ML bcc͑110͒/3 ML fcc͑001͒ Fe film with the bcc͗111͘ʈfcc͗110͘ in-plane orientation. Interlayer spacings of 2.05Ϯ0.06 Å, 2.01Ϯ0.03 Å, and 1.85Ϯ0.03 Å were found in the bcc region, between bcc and fcc layers and in the fcc region, respectively. Best-fit in-plane nearest-neighbors ͑n-n͒ distance was 2.49Ϯ0.02 Å, in registry with that of the Ni substrate. To analyze the 7-ML data a 4 ML bcc͑110͒/3 ML fcc͑001͒ film was employed, varying the fitting parameters in the bcc region only. Best fit was obtained for an interlayer spacing of 2.04Ϯ0.04 Å and in plane n-n distance of 2.47Ϯ0.01 Å. At 14 ML the PD pattern collected over a 94°azimuthal range displayed symmetry around the ͓110͔ substrate direction, which was explained by the equipopulation of the 4 bcc͑110͒ domains satisfying the bcc͗111͘ʈfcc͗110͘ alignment.

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Section: Pd Experimental Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Structural analysis of Fe/Ni(001) films by photoelectron diffraction

et al. 2000

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“…At the same time, a match between the fcc lattices (a Ni = 0.352 nm) requires a compression as small as 2%. The formation of a pseudomorphous fcc Fe phase on (001) Ni and the subsequent transition to the bcc structure were also observed in later studies [43,44]. At a small mismatch between dissimilar lattices, e.g., in the Fe/Au(001) and Fe/Ir(001) systems [45], the body-centered pseudomorphous phase persists.…”

Section: Single-phase Nanostructuressupporting

confidence: 55%

“…At a small mismatch between dissimilar lattices, e.g., in the Fe/Au(001) and Fe/Ir(001) systems [45], the body-centered pseudomorphous phase persists. According to LEED and electron emission results for Fe films with Θ ≤ 25 on (001) Ni [44], the films with Θ ≤ 5 have a pseudomorphous, strained fcc structure, with intermixing of Fe and Ni atoms at Θ ≤ 3. At Θ > 5, a transition to the bcc structure occurs, reaching completion at Θ = 14, with orientations (2).…”

Section: Single-phase Nanostructuresmentioning

confidence: 99%

Thin-film nanostructures: Substructural aspects

Иевлев

2004

Inorg Mater

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A classification of thin-film nanostructures grown by vacuum deposition processes is presented. Particular attention is given to the formation of multioriented epitaxial nanostructures. Multioriented epitaxial growth is shown to depend on the interfacial energy. The size effect in the growth of oriented nanostructures is discussed. The possibility of grain refining in fcc/bcc and hcp/bcc metallic multilayers is examined. The interrelated issues pertaining to the formation of multilayer heterostructures are systematized. S72

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“…Such a superposition model has been already proved to be successful in describing multilayered systems. 20,32,33 An IAD from 10-ML(40-ML)-thick Co film was used as reference bct (hcp) IAD, to synthetize IADs from bilayers with different thickness of the bct and hcp components. The relative weight of bct and hcp contribution to each IAD at intermediate coverage has been obtained by minimizing the R factor between the measured and synthetized IADs.…”

Section: Resultsmentioning

confidence: 99%

GROWTH MODE OF ULTRATHIN Co FILMS ON Fe(001) PREPARED BY LOW ENERGY ION-ASSISTED DEPOSITION

et al. 1999

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Co films were epitaxially grown on Fe(001) by simultaneous thermal evaporation of Co atoms and ion bombardment with low-energy (300-1000 eV) Ar ions in a wide range of ion-to-atom flux ratio (0.02-0.5). The 0-50 ML coverage range was investigated. Transition from island growth to a continuous layer growth occurs on passing from purely thermal to ion-assisted deposition procedure. Structural characterization was performed by Primary-beam Diffraction Modulated Electron Emission (PDMEE). For purely thermal deposition, transition from the bcc phase to the equilibrium, hcp phase has been observed at a critical coverage of about 15 ML, both structures showing a significant strain (7% contraction and 5% expansion with respect to the ideal bcc and hcp phase, respectively). Ion assistance has proved to be effective in lowering both the strains in the Co film and the critical thickness of the bcc phase.

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Epitaxial growth of ultrathin Fe films on Ni(001): a structural study

Cited by 23 publications

References 23 publications

Structural analysis of Fe/Ni(001) films by photoelectron diffraction

Structural analysis of Fe/Ni(001) films by photoelectron diffraction

Thin-film nanostructures: Substructural aspects

GROWTH MODE OF ULTRATHIN Co FILMS ON Fe(001) PREPARED BY LOW ENERGY ION-ASSISTED DEPOSITION

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