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Étude du transport dépendant du spin dans des nanostructures à base de manganite

Abstract : Half-metals due to their high spin polarization play a key role in spintronics. We have chosen to study one of them, the manganite La0.7Sr0.3MnO3 (LSMO). Spin-dependent transport properties were studied using epitaxial LSMO layer. It was required to study also epitaxy and strain relaxation of these films. Induced modifications of magnetic properties of LSMO in these films is also addressed. Magnetotransport properties of heterojunctions formed in oxyde superlattices of LSMO/SrTiO3 (STO) and in hybrid trilayers of LSMO/STO/Co0.88Fe0.12 are studied. Both heterojunctions shows premature decrease of the magnetoresistives effects in temperature. This behavior is linked to premature decrease of magnetism at surfaces of LSMO. Therefore, profile of magnetism and oxygen stoichiometry through the thickness of LSMO films is investigated using polarized neutron reflectometry and X-ray reflectivity.
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https://tel.archives-ouvertes.fr/tel-00005480
Contributor : Emmanuel Favre-Nicolin <>
Submitted on : Monday, March 29, 2004 - 3:22:37 PM
Last modification on : Friday, December 18, 2020 - 1:22:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:44:27 PM

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  • HAL Id : tel-00005480, version 1

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Emmanuel Favre-Nicolin. Étude du transport dépendant du spin dans des nanostructures à base de manganite. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00005480⟩

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