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<dc:title xml:lang="en">Spintronics under stress</dc:title>
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<dc:subject xml:lang="fr">Matériaux multiferroïques</dc:subject>
<dc:subject xml:lang="en">Ferroelectricity</dc:subject>
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<dc:subject xml:lang="en">Multiferroicity</dc:subject>
<dc:subject xml:lang="en">Magnetostriction</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, les interactions magnétoélectriques et optomagnétiques transmises par les contraintes dans les structures ferroélectriques/ferromagnétiques sont étudiées. Nous montrons que la dynamique des déformations du Pb(ZrxTi1-x)O3 aboutit à la manipulation électrique sous-coercitive de multi-états ferroélastiques rémanents. La mesure par une jauge résistive de ces états, ainsi que l'écriture et l'effacement électriques et le stockage ferroélastique, sont démontrés. La configuration des contraintes de matériaux ferroélectriques créée électriquement, permet de modifier l'anisotropie magnétique d'une couche ferromagnétique. Ce phénomène est utilisé pour contrôler le champ magnétique coercitif des composants magnétostrictifs des vannes de spin au moyen des déformations. L’irradiation lumineuse est également utilisée pour entraîner une photostriction rémanente dans le BiFeO3. Cette déformation rémanente est transférée à une couche ferromagnétique et permet un contrôle optique de la coercivité magnétique. Nous montrons comment les états magnétiques peuvent être écrits au moyen de la lumière et effacés par un champ électrique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, the strain-mediated magnetoelectric and optomagnetic interactions in ferroelectric/ferromagnetic structures are studied. The strain dynamics in Pb(ZrxTi1-x)O3 is shown to result in the sub-coercive electrical manipulation of its remanent ferroelastic multi-states. The resistive readout of these states provided by the strain gauge layers, together with the electrically-triggered ferroelastic writing, storage, and erasing, are demonstrated. These strain configurations created by electric fields in ferroelectrics can effectively impact the magnetic anisotropy of a ferromagnetic adlayer. This phenomenon is shown to control the magnetic coercive field of the magnetostrictive components of spin valves via the strain. Light irradiation is shown to result in remanent photostriction effect (photo-driven deformation) in BiFeO3. Such optically-induced remanent deformations can be transferred to a ferromagnetic adlayer and result in the optical control of the magnetic coercive force. It is shown here how magnetic states can be written by light and erased by an electric field.</dcterms:abstract>
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