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<dc:title xml:lang="fr">Dynamique d'aimantation ultra-rapide de nanoparticules magnétiques</dc:title>
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<dc:subject xml:lang="fr">Landau-Lifshitz</dc:subject>
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<dc:subject xml:lang="en">Landau-Lifshitz</dc:subject>
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<dcterms:abstract xml:lang="fr">L’objectif de cette thèse est d’explorer analytiquement et numériquement la dynamique d’aimantation de nanoparticules magnétiques. Nous montrons qu’il est possible de contrôler efficacement le retournement d’aimantation d’une nanoparticule à l’aide d’une excitation autorésonante. Cette étude révèle que l’amortissement de Gilbert et la température altèrent l’efficacité de ce procédé, tandis que les interactions dipolaires peuvent le faciliter. Les propriétés stationnaires d’une monocouche de nanoparticules sont également étudiées en reproduisant numériquement des courbes ZFC. Nous observons ainsi qu’un désordre structurel ne modifie pas la température de blocage. Enfin, nous étudions le comportement d’un ensemble de nanoparticules en interaction dans un fluide à l’aide de simulations de dynamique moléculaire. Nous retrouvons les configurations à l’équilibre en forme de chaînes et d’anneaux, puis nous examinons les aspects dynamiques en mettant en évidence l’existence d’ondes de spins.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The goal of this thesis is to explore analytically and numerically the magnetization dynamics in magnetic nanoparticles. Firstly, we study the Néel dynamics of fixed. We show that one can efficiently control the magnetization reversal of a nanoparticle by using a chirped excitation (autoresonance). This study reveals that the Gilbert damping and the temperature alter the efficiency of the reversal, while dipolar interactions can improve it. The stationary properties of a monolayer of nanoparticles are then examined by computing ZFC curves with a Monte Carlo method. We observe that structural disorder has no effect on the blocking temperature. Finally, we investigate the behavior of an ensemble of interacting nanoparticles moving in a fluid with a molecular dynamics approach. Our numerical simulations reproduce the usual chain and ring-like equilibrium configurations. We then study the dynamics of these structures and show the existence of super-spin waves.</dcterms:abstract>
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