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Developpement d'un code de calcul micromagnetique 2D et 3D: Application a des systemes reels de types films, plots et fils

Abstract : The magnetic behavior of lateral confined ferromagnetic systems is of great interest both from a fundamental and a technological point of view. The understanding of the effects induced by reducing the system sizes requires a combined experimental and theoretical study. The aim of this work is to develop specific numerical tools for the investigation of ferromagnetic systems based on micromagnetic modelling. A finites differences method is used for the evaluation of the energies and the fields describing the magnetic configuration of the system. The minimization procedure of the free energy includes the time integration of the Landau-Lifshitz-Gilbert equation. The improvement of the numerical precision, the enhancement of the stability of the integration scheme and the validation of the codes developed against standard problems as well as against experimental results, has been a permanent effort throughout this work. The flexibility of such a numerical approach allows us to investigate bi- and tri-dimensional, periodic and non-periodic systems. In particular, the details of the magnetization configuration of domain walls in Co thin films with in-plane or out-of-plane magnetocrystalline anisotropy have been obtained and analyzed as a function of the thickness of the film and the externally applied field. The 3D simulation studies of the cylindrical Co dots have established the limits of stability of different magnetic configurations depending on the dot sizes and the material parameters. Special attention has been given to the evolution of the vortex state and its stability under a perpendicular applied field. The tri-dimensional features of the domain walls in epitaxial Co wires with magnetocrystalline anisotropy parallel or perpendicular to the wire axis have been confirmed.
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Contributor : Liliana-Daniela Buda <>
Submitted on : Wednesday, June 25, 2003 - 11:19:39 AM
Last modification on : Tuesday, April 27, 2021 - 10:02:05 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:11:19 PM


  • HAL Id : tel-00003049, version 1



Liliana-Daniela Buda. Developpement d'un code de calcul micromagnetique 2D et 3D: Application a des systemes reels de types films, plots et fils. Matière Condensée [cond-mat]. Université Louis Pasteur - Strasbourg I, 2001. Français. ⟨tel-00003049⟩



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