Surface morphology of NiO layers on MgO(0 0 1), MgO(1 1 0) and MgO(1 1 1)

Warot, B.; Snoeck, E.; Ousset, J.C.; Casanove, Marie‐José; Dubourg, S.; Bobo, Jean-François

doi:10.1016/s0169-4332(01)00725-5

Cited by 20 publications

(12 citation statements)

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“…29 Nevertheless RHEED patterns obtained from the MgO (111) surface after annealing did not seem to indicate substrate surface reconstruction in our case. This is quite interesting in view of the high instability predicted for this surface but it is also consistent with the findings of Warot et al 30 As stated above the epitaxial growth of Ni films is highly favored when the substrate temperature is 300 o C. RHEED indicates that the Ni growth is characterized by highly strained layers during the early stages that relax to bulk Ni very rapidly indicating that the relaxation of the strain is achieved by a large number of dislocations near the interface. This was confirmed by STM images of the surface, which show many vacancy islands at the center of hexagonal terraces.…”

Section: Discussion Of Structural Resultssupporting

confidence: 93%

Self-assembled NiO nano-wires on epitaxial Ni films

2005

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In-situ annealed epitaxial (001) Ni films MBE grown on MgO substrates exhibit a missing-row (2x1) surface reconstruction due to oxygen adsorption. Thus, the resulting nano-patterning of the surface consists of self-assembled NiO nano-wires. Correlated RHEED, STM, XTEM, PNR and MOKE studies indicate that there is intermixing of the Ni film and the substrate with NiO formation at the interface between film and substrate and also on the surface of the films. This leads to the presence of an additional uniaxial magnetic anisotropy superimposed to the expected 4-fold magneto-crystalline anisotropy as determined with longitudinal MOKE.

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Section: Discussion Of Structural Resultssupporting

confidence: 93%

Self-assembled NiO nano-wires on epitaxial Ni films

2005

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“…The influence of structural effects in the Ni 2p XPS spectra should also be evaluated. For instance, Warot et al 23 found that the surface morphology of the NiO overlayer depends on the surface orientation in different MgO single-crystal substrates. In our case, the AFM images of the MgO substrate shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[16][17][18] In particular, the growth of thin NiO films on MgO has been studied in more detail. 9,[19][20][21][22][23] NiO has been found to grow epitaxially on MgO ͑100͒ single crystal. Studies on the electronic structure by XPS during the growth process of NiO on MgO ͑100͒ show that for a coverage of 1 ML, the main line of the Ni 2p XPS spectra is narrowed and slightly shifted to higher binding energies.…”

Section: Introductionmentioning

confidence: 99%

“…20 Structural studies on NiO grown on MgO ͑001͒ show that, initially, the overlayer NiO lattice grows coherently until a critical thick-ness of 60 nm is reached, at which relaxation of the NiO lattice occurs. 22 On the other hand, the work of Warot et al 23 shows that NiO grows forming different nanostructures depending on the MgO surface orientation, giving wires for MgO ͑110͒ and tetrahedrons for MgO ͑111͒.…”

Section: Introductionmentioning

confidence: 99%

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Interface effects in theNi2px-ray photoelectron spectra of NiO thin films grown on oxide substrates

et al. 2008

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We report the Ni 2p x-ray photoelectron spectra of NiO thin films grown on different oxide substrates, namely, SiO 2 , Al 2 O 3 , and MgO. The main line of the Ni 2p spectra is attributed to the bulk component, and the shoulder at 1.5 eV higher binding energies to the surface component. The spectra of the NiO thin films show strong differences with respect to that of bulk NiO. The energy separation between the main peak and the shoulder increases with the substrate covalence. This indicates the strong covalent interactions between the NiO thin films and the oxide substrates, and reflects changes in the bonding at the interface from a more ionic to a more covalent interaction. These conclusions are supported by cluster model calculations with a reduced O 2p-Ni 3d hybridization.

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“…Successive (1 1 1) sheets are coupled antiparallely. Thus, the NiO {0 0 1} and {1 1 0} planes are spin compensated surfaces with no resulting moment nor electrical charge while NiO{1 1 1} is a polar surface carrying a magnetic moment [8]. The lattice mismatch between NiO and Fe 3 O 4 is to 0.5% (considering half of the spinel cell).…”

Section: Methodsmentioning

confidence: 99%