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Transport électronique et transport dépendant du spin dans Fe3O4 et à ses interfaces.

Abstract : Fe3O4, or magnetite, the oldest known magnetic material, is still the subject of open questions relevant to today's physics. Since the 1990s, the developpement of spin electronics has lead to revisiting this material. It has indeed be predicted to be a half metallic ferromagnet, which associated to its high magnetic order temperature (850~K), could produce large magnetoresistance effects at room temperature. Magnetite also has interesting electric properties, such as a hopping transport mechanism, a high resistivity at low temperature and a metal-insulator transition. We have studied epitaxial thin films of magnetite made by pulsed laser deposition. Their magnetism has unexpected features related to a heterogenous composition or structural defects characteristic of such films (antiphase boundaries). We have then prepared multilayer structures, which show evidence of novel magnetoresistive effects specific to oxides, such as a specular giant magnetoresistance, and a spacerless magnetoresistance mechanism.
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Contributor : Baptiste Carvello <>
Submitted on : Tuesday, December 18, 2007 - 2:13:37 PM
Last modification on : Friday, December 18, 2020 - 1:22:02 PM
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  • HAL Id : tel-00199075, version 1




Baptiste Carvello. Transport électronique et transport dépendant du spin dans Fe3O4 et à ses interfaces.. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00199075⟩



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