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PROPRIETES MAGNETIQUES DE NANOMATERIAUX : ETUDE PAR LA METHODE MONTE CARLO

Abstract : This work presents the study of the magnetic and thermal properties of nanomaterials. We study the influence of the external magnetic field and the crystal field on the magnetic phase transitions, critical temperature, compensation temperature, magnetization, susceptibility and hysteresis cycles of these nano-systems by the Monte Carlo method with the Blume-Capel model. We discuss the effect of exchange coupling interactions and we determine phase diagrams at ground state in the following cases: - system built on a centered cubic structure with mixed spins. - spherical core-shell system. The shell sites are populated with probability p. - system composed of two magnetic bi-fullerene surfaces separated with non magnetic surfaces. The influence of the thickness of the non-magnetic surfaces, crystalline and external magnetic fields, and also the interaction RKKY, are discussed. - MnBi system. The effect of the number of layers on its magnetic properties and the hysteresis cycle are analyzed.
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https://tel.archives-ouvertes.fr/tel-01676932
Contributor : Taoufik Sahdane <>
Submitted on : Saturday, January 6, 2018 - 8:52:41 PM
Last modification on : Friday, August 9, 2019 - 3:10:33 PM
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Taoufik Sahdane. PROPRIETES MAGNETIQUES DE NANOMATERIAUX : ETUDE PAR LA METHODE MONTE CARLO. Science des matériaux [cond-mat.mtrl-sci]. Université Mohammed V Rabat (Maroc), 2017. Français. ⟨tel-01676932⟩

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