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Your search keyword '"Angeloni, M."' showing total 3 results
Start Over Author "Angeloni, M." Topic pulsed laser deposition
3 results on '"Angeloni, M."'

1. Preparation and characterization of LaMnO3 thin films grown by pulsed laser deposition.

Author

Aruta, C., Angeloni, M., Balestrino, G., Boggio, N. G., Medaglia, P. G., Tebano, A., Davidson, B., Baldini, M., Di Castro, D., Postorino, P., Dore, P., Sidorenko, A., Allodi, G., and De Renzi, R.

Subjects
*THIN films, *SURFACES (Technology), *PULSED laser deposition, *RAMAN effect, *LIGHT scattering, *NUCLEAR magnetic resonance
Abstract

We have grown LaMnO3 thin films on (001) LaAlO3 substrates by pulsed laser deposition. X-ray diffraction confirms that the films are only slightly relaxed and are oriented “square on square” relative to the substrate. The measured Raman spectra closely resemble that observed in bulk LaMnO3, which indicates no relevant distortions of the MnO6 octahedra induced by the epitaxial strain. Therefore, no detectable changes in the lattice dynamics occurred in our LaMnO3 strained films relative to the bulk case. 55Mn nuclear magnetic resonance identifies the presence of localized Mn4+ states. Superconducting quantum interference device magnetization measures TN=131(3) K and a saturation moment μ=1.09μB/Mn, revealing a small concentration of Mn4+ and placing our films within the antiferromagnetic insulating phase. [ABSTRACT FROM AUTHOR]

Published
2006
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2. Synchrotron X-ray diffraction study of SrRuO3/SrTiO3/SrRuO3 nano-sized heterostructures grown by laser MBE.

Author

Aruta, C., Angeloni, M., Balestrino, G., Medaglia, P. G., Orgiani, P., Tebano, A., and Zegenhagen, J.

Subjects
*SYNCHROTRONS, *X-ray diffraction, *HETEROSTRUCTURES, *SUPERLATTICES, *PULSED laser deposition
Abstract

Structural investigation using X-ray synchrotron radiation has been performed on SrRuO3/SrTiO3/SrRuO3 epitaxial heterostructures, with each constituent layer a few unit cell thick grown on (001) SrTiO3 substrate. Detailed information on the evolution of the in-plane lattice structure has been obtained, in these heterostructures, by grazing incidence diffraction measurements. The samples have been grown by low-pressure pulsed laser deposition. Under our deposition conditions, SrRuO3 layers grow with an elongated cell perpendicular to the substrate surface. The in-plane pseudocubic lattice parameters do not match the in-plane square SrTiO3 structure even in the case of very thin SrRuO3 layers. Such a distortion was found to decrease with increasing the thickness of the SrTiO3 barrier layer. [ABSTRACT FROM AUTHOR]

Published
2005
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3. A correlated study of laser produced plume expansion dynamics and thin film growth of manganates

Author

M. Angeloni, Salvatore Amoruso, Giuseppe Balestrino, M. Vitiello, Antonello Tebano, N. G. Boggio, Riccardo Bruzzese, Xuan Wang, Pier Gianni Medaglia, Amoruso, Salvatore, Angeloni, M, Balestrino, G, N., Boggio, Bruzzese, Riccardo, Medaglia, P. G., Tebano, A, Vitiello, M, and Wang, X.

Subjects
Reflection high-energy electron diffraction, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, manganate, Oxygen, Pulsed laser deposition, law.invention, Settore FIS/03 - Fisica della Materia, chemistry.chemical_compound, Pulsed Laser Deposition, Electrical resistance and conductance, law, Deposition (phase transition), metal-insulator, Thin film, Manganate, Surfaces and Interfaces, General Chemistry, Condensed Matter Physics, Laser, Surfaces, Coatings and Films, laser, plume expansion, chemistry
Abstract

Thin films of La0.67Ba0.33MnO3 were deposited on NdGaO3 by pulsed laser deposition with in situ RHEED diagnostics. A strong dependence of structural and electrical transport properties of the films on the background oxygen pressure was observed. Electrical resistance versus temperature and X-ray diffraction measurements were used to characterise the deposited films. Deposition at low background oxygen pressure (approximate to 10(-1) Pa) resulted in a good structural quality with an atomically flat surface, but poorer transport properties compared to films grown at higher pressure (approximate to 50 Pa). These observations have been correlated with the characteristics of the plume expansion by studying pulsed laser ablation of manganate samples into oxygen background gas by optical emission spectroscopy and ion probe diagnostics. These studies have been carried out using the parent LaMnO3 compound as target material in presence of an oxidizing atmosphere.

Published
2005

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