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Dynamique d'aimantation dans les assemblées d'agrégats ferromagnétiques : effets des interactions

Abstract : In our work, we used Monte Carlo technique to simulate the effect of dipolar interactions on the magnetization reversal of a ferromagnetic nanoparticles assembly. In our model, we considered nanoparticles with uniaxial anisotropy and specifically the Cobalt. With the condition KV/kBT >> 1, the magnetic moment of each nanoparticle is fixed in its equilibrium positions and it can not fluctuate around. We chose to our investigation the ac susceptibility because it provides the advantage of making the study with a wide frequency range without changing measurement technique, because the measurement time is equal to the inverse of the frequency of the alternating magnetic field applied. We studied twelve types of assemblies each one differs from the other by some properties : The shape of the assembly, the spatial distribution of the nanoparticles or the distribution of the anisotropy axes. And we discerned the influence of each of theses parameters on the effect of dipolar interactions on the magnetization reversal.
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https://tel.archives-ouvertes.fr/tel-01692612
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Submitted on : Thursday, January 25, 2018 - 12:09:08 PM
Last modification on : Thursday, November 28, 2019 - 3:08:28 AM
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  • HAL Id : tel-01692612, version 1

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Drifa Brinis. Dynamique d'aimantation dans les assemblées d'agrégats ferromagnétiques : effets des interactions. Mécanique des matériaux [physics.class-ph]. Normandie Université; Université M'hamed Bougara de Boumerdès (Algérie), 2017. Français. ⟨NNT : 2017NORMR049⟩. ⟨tel-01692612⟩

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