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Dynamique d'aimantation ultra-rapide de nanoparticules magnétiques

Abstract : 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.
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Submitted on : Thursday, December 8, 2016 - 4:05:05 PM
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Guillaume Klughertz. Dynamique d'aimantation ultra-rapide de nanoparticules magnétiques. Matière Condensée [cond-mat]. Université de Strasbourg, 2016. Français. ⟨NNT : 2016STRAE004⟩. ⟨tel-01412680⟩

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