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Elaboration de couches minces de SmFeO3 et LaNiO3, de structure perovskite, par dépôt laser pulsé
Etudes associées des transitions de phase à haute température par ellipsométrie spectroscopique in situ.

Abstract : This work presents the growth of SmFeO3 (SFO) and LaNiO3 (LNO) thin films by pulsed laser deposition.
First, we have focused on deposition conditions of SFO growth on fused quartz substrate. Thicknesses have been calculated from in situ ellipsometric measurements during the growth. Furthermore, optical indexes and lattice parameters show two transition temperatures in correlation with the Curie (Tc) and spin reorientation (TRS) temperatures. Epitaxial cube on cube growth has been obtained on SrTiO3 (STO) (001). In this case, the easy magnetization axis, as measured by SQUID magnetometry, is perpendicular to the film plane at room temperature whereas it is expected to be along the a direction .
Second, substrate temperatures and oxygen pressures have been varied to determine the optimal deposition conditions for epitaxial cube on cube growth of LNO films on STO (001) substrate. The thermal variation of optical indexes is linear with a change in the slope around [200-300°]. In situ spectroscopic ellipsometry is used, as well, for the detection of the metal-insulator transition associated with the reduction and re-oxygenation of thin films. The kinetics of this last transformation are detailed and we show that it's possible to tune of the oxidation state.
Finally, SFO/LNO/STO and SFOII/LNOII/SFOI/LNOI/STO heterostructures have been made. Again, the growth of SFO on LNO is epitaxial (cube on cube). Transport measurements have revealed an effect of both SFO and LNOII thicknesses at low temperature and are discussed here.
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https://tel.archives-ouvertes.fr/tel-00243093
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Submitted on : Wednesday, February 6, 2008 - 4:31:00 PM
Last modification on : Friday, January 10, 2020 - 3:42:18 PM
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Bruno Berini. Elaboration de couches minces de SmFeO3 et LaNiO3, de structure perovskite, par dépôt laser pulsé
Etudes associées des transitions de phase à haute température par ellipsométrie spectroscopique in situ.. Matière Condensée [cond-mat]. Université de Versailles-Saint Quentin en Yvelines, 2007. Français. ⟨tel-00243093⟩

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