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  • 1
    Electronic Resource
    Electronic Resource
    Experimental evidence of structural evolution in ultrafine cobalt particles stabilized in different polymers—From a polytetrahedral arrangement to the hexagonal structure (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8137-8145 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ultrafine cobalt particles have been reproducibly synthesized by decomposition of an organometallic precursor in the presence of a stabilizing polymer. The size of the stable monodisperse colloids thus obtained is seen to strongly depend on the nature of the polymer: around 4.2 nm diameter in polyphenylenoxide (PPO) and around 1.4 nm diameter in polyvinylpyrrolidone (PVP). Investigations by wide angle x-ray scattering (WAXS) and high-resolution transmission electron microscopy (HRTEM) give evidence for a size dependence of the structural organization, and hence for a close relationship between structure and synthesis conditions. Co/PPO particles exhibit a hexagonal compact structure with the metal–metal bond length of the bulk material while Co/PVP ones display an original structure. We show that the unusual features of the experimental data in Co/PVP clearly point to a nonperiodic polytetrahedral structure. Successful simulations of the HRTEM and WAXS results have been obtained using models built on the basis of a polytetrahedral arrangement. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481414
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  • 2
    Electronic Resource
    Electronic Resource
    Growth and stress relaxation of Co/NiO bilayers on MgO(001) (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5414-5420 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/NiO bilayers have been grown on a MgO(001) surface in an ultrahigh vacuum sputtering chamber under various deposition conditions. Investigations by x-ray diffraction, atomic force microscopy, and high resolution transmission electron microscopy give evidence for a close relationship between structure and deposition conditions for the two different layers. The role of the deposition rate on the oxide layer surface roughness is particularly emphasized. At high deposition rates, surface roughness increases with temperature, whereas the surface remains flat for low deposition rates. Whatever the growth conditions, the NiO layer grows epitaxially on the MgO substrate with the orientation relationship NiO(001)[100]//MgO(001)[100]. The misfit strain (about 1%), elastically accommodated in the thinner layers (3 nm), is fully relaxed in 50-nm-thick layers. A temperature dependence of the cobalt layer structure is observed: at room temperature it grows in its high temperature face-centered cubic structure, whereas it grows in the hexagonal close-packed structure at slightly higher temperatures. The influence of oxygen deficiency in NiO on the growth mode of the cobalt layer is also discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361240
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  • 3
    Electronic Resource
    Electronic Resource
    Structural, magnetic, transport, and magneto-optical properties of single crystal La2/3Sr1/3MnO3 thin films (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6773-6775 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown La0.7Sr0.3MnO3 thin films by reactive facing target radio frequency sputtering on SrTiO3 (001) substrates with the nominal stoichiometry and the perovskite structure down to nanometer-scale film thickness. The films are found to be perfectly expitaxied on SrTiO3, without misfit dislocations. The surfaces of the layers were found to be highly flat with terraces of (approximate)4 Å height corresponding to the manganite unit cell. Magnetic measurements evidence a decrease of the Curie temperature for decreasing thickness. Low temperature magnetoresistance is very small, confirming the absence of grain boundaries in the films but it reaches (approximate)−50% at room temperature. Finally, magneto-optical Kerr effect measurements between 20 and 400 K reveal the onset of ferromagnetic transition via the coercive field increase and the Kerr rotation and ellipticity measurements. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372837
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  • 4
    Electronic Resource
    Electronic Resource
    Composition-structure correlations in strained FexMn1−x/Ir superlattices (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 4605-4611 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural and chemical characteristics of FexMn1−x alloys in [FexMn1−x/Ir(001)] superlattices with iron contents of x=0.3, 0.5 and 0.9 are investigated at the nanometer scale by high resolution transmission electron microscopy and electron energy loss spectroscopy techniques. The transmission electron microscopy experiments show that pseudomorphic growth of the alloy on Ir is only achieved for x≥0.5. Layers with iron content x=0.5 display, however, structural inhomogeneities and a weak Mn segregation effect. Layers with a high iron content, Fe0.9Mn0.1 are seen to present a quasiperiodic lattice modulation. We suggest that this modulation is associated with spinodal decomposition. All these structural investigations indicate that, in epitaxial strained thin layers, the FexMn1−x alloy reproduces almost all of the complex FexMn1−x phase diagram with, however, a marked shift towards the low Fe content regions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311301
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  • 5
    Electronic Resource
    Electronic Resource
    Transport, Magnetic and Time Dependent Effects in Metal-Insulator Granular Layered Films (2001)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 373-376 (Aug. 2001), p. 81-86 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/05/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.373-376.81.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic behavior and role of the antiphase boundaries in Fe3O4 epitaxial films sputtered on MgO (001) (2001)
    Springer
    The European physical journal 24 (2001), S. 43-49 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.70.-i Magnetic properties of thin films, surfaces, and interfaces – 75.60.-d Domain effects, magnetization curves, and hysteresis – 78.20.Ls Magnetooptical effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Magnetite Fe3O4 films were grown on single crystal MgO (001) substrates using facing target sputtering technique. Conversion Electron Mössbauer Spectroscopy and magneto optical polar Kerr spectra have confirmed the stoichiometric repartition of Fe cations corresponding to the inverse spinel structure and the electronic structure characteristic of bulk Fe3O4. Hysteresis loops carried out at room temperature show that, in a 1 T applied magnetic field, only 60% of the saturation magnetization is detected. This behavior is discussed in correlation to the antiphase boundaries (APBs) observed by electron microscopy. Magnetic force microscopy studies show that magnetic domains are larger than the mean distance between APBs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170020
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence of bcc Mn epitaxial growth in Mn/M V (001) (M = Fe, Nb) superlattices (2000)
    Springer
    The European physical journal 15 (2000), S. 41-50 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 68.55.-a Thin film structure and morphology - 68.65.+g Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties - 75.70.-i Magnetic films and multilayers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: This study is dedicated to the growth of bcc Mn by molecular beam epitaxy, in order to look at the magnetic properties of bcc Mn near room temperature. For this purpose, Mn is deposited on bcc MxV1-x(001) alloy lattices (M = Fe or Nb) for which the lattice spacing is tunable by varying the concentration x. We first show that the parameter of the MxV1-x alloy's buffer layers can be adjusted from 2.95 Å to 3.3 Å depending on x and M. Three different structures in Mn films grown on these buffer layers are observed depending on the in-plane spacing of the initial MxV1-x lattice. Thick Mn films are always found to grow epitaxially in the Mn structure. For moderate thicknesses larger than 4 atomic planes, Mn grows in an unidentified structure. Finally, up to four deposited atomic planes, Mn is found to grow in a tetragonal structure close to a bcc one on Fe(001), FexV1-x(001) and NbxV1-x(001) for . This tetragonal structure is shown to be a distorsion of a Mn bcc structure with . Except for ultra-thin Mn films deposited on Fe(001), no macroscopic magnetization is detected in our strained bcc Mn samples. These results are compared to theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011035
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  • 8
    Electronic Resource
    Electronic Resource
    Structural characterisation of Ni clusters in AlN via X-ray absorption, X-ray diffraction and transmission electron microscopy (2000)
    Springer
    The European physical journal 12 (2000), S. 171-179 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 61.46.+w Clusters, nanoparticles, and nanocrystalline materials – 61.10.Ht X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc. – 61.10.-i X-ray diffraction and scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Ni ions were implanted in bulk AlN with the goal to form embedded metallic clusters. Combining several characterisation techniques such as X-ray absorption spectroscopy, X-ray diffraction and high resolution transmission electron microscopy, we determined the lattice parameter of the Ni clusters that display a fcc crystalline structure. The average size increases when the ion fluence is increased or after a thermal treatment. Thanks to moiré fringes observed by high resolution transmission electron microscopy and to satellite peaks seen on the diffraction patterns, we concluded that the annealed Ni clusters orientate their (002) planes on the (101) of AlN. Moreover, the satellite positions allowed us to calculate Ni cluster average diameters, that are in agreement with average sizes deduced by X-ray absorption spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530070054
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