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<dc:title xml:lang="en">Modifying magnetic properties by ion irradiation or light-matter coupling : towards innovative magnetic memory devices</dc:title>
<dcterms:alternative xml:lang="fr">Modification des propriétés magnétiques par ion irradiation ou couplage lumière-matière : vers dispositifs de mémoire magnétique innovants</dcterms:alternative>
<dc:subject xml:lang="fr">Films minces</dc:subject>
<dc:subject xml:lang="fr">Nanomagnétisme</dc:subject>
<dc:subject xml:lang="fr">Anisotropie magnétique perpendiculaire</dc:subject>
<dc:subject xml:lang="fr">Couple spin-orbite</dc:subject>
<dc:subject xml:lang="fr">Irradiation par ions He+</dc:subject>
<dc:subject xml:lang="fr">Commutation multiniveau</dc:subject>
<dc:subject xml:lang="fr">Nucléation de domaine</dc:subject>
<dc:subject xml:lang="fr">Mouvement de paroi de domaine</dc:subject>
<dc:subject xml:lang="en">Thin film</dc:subject>
<dc:subject xml:lang="en">Nanomagnetism</dc:subject>
<dc:subject xml:lang="en">Perpendicular magnetic anisotropy</dc:subject>
<dc:subject xml:lang="en">Spin-orbit torque</dc:subject>
<dc:subject xml:lang="en">He+ ion irradiation</dc:subject>
<dc:subject xml:lang="en">Multi-level switching</dc:subject>
<dc:subject xml:lang="en">Domain nucleation</dc:subject>
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<dcterms:abstract xml:lang="fr">Cette thèse est consacrée à la manipulation des propriétés magnétiques dans les composites de particules et les films minces. La première partie explore la manipulation de l'anisotropie magnétique de dispositifs magnétiques couches minces en utilisant l'irradiation par ions He+. Les effets induits par irradiation sur des films minces à anisotropie magnétique perpendiculaire sont caractérisés pour leurs propriétés magnétiques et de commutation de l'aimantation induite par le couplage spin-orbite. Le faisceau d'ions focalisés est utilisé comme outil pour définir la configuration d'anisotropie des dispositifs. Nous montrons qu'avec design approprié, nous obtenons des dispositifs de commutation multi-niveaux et créons des centres de nucléation de domaines contrôlés dans les échantillons, illustrant le potentiel d'une approche d’irradiation ‘sur mesure’ pour atteindre les résultats souhaités.La deuxième partie de la thèse se concentre sur nos recherches sur le couplage fort lumière-matière, une technique prometteuse pour la modification des propriétés intrinsèques. Dans le domaine du couplage fort, nous explorons l'interaction des matériaux magnétiques inorganiques et organiques fabriqués sous forme de nanoparticules et de microparticules.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This thesis is dedicated to the manipulation of magnetic properties in nanoparticles and thin films. The initial section explores the magnetic anisotropy manipulation of thin film devices using He+ ion irradiation. Irradiation-induced effects on thin films engineered for perpendicular magnetic anisotropy are characterized by magnetic properties and spin-orbit torque-driven magnetization switching studies. The focused ion beam is used as a tool to pattern appropriate anisotropy landscapes on devices. We show that with careful design, multi-level switching devices and controlled domain nucleation centers in samples are obtained, highlighting the potential for tailored irradiation patterns enable the desired outcomes.The second part of the thesis focuses on our investigations of light-matter strong coupling—a promising technique for intrinsic property modifications. Delving into the realm of strong coupling, we explore the interplay of inorganic and organic magnetic materials fabricated as nano and microparticles.</dcterms:abstract>
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