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New numerical approaches for micromagnetism and Current-induced domain wall motion

Abstract : The purpose of the work presented here is twofold. The first task was to provide a simulation tool based on the finite element method. Two finite element formulations were derived for the dynamic Landau-Lifshitz-Gilbert equation. The first is based on the resolution of the dynamic equation including the constraint on the magnetization, while the second uses test functions that belong to the tangent space of the magnetization. Only the second approach reproduced accurately the magnetization dynamics for several test cases. The second part of the manuscript concerns the study of magnetic domain wall displacement in systems with perpendicular magnetocrystalline anisotropy. This study required the insertion of two new terms in the Landau-Lifshitz-Gilbert equation. Both ideal and systems with different kind of defects were studied. Whenever possible, comparison with experimental results is carried out.
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https://tel.archives-ouvertes.fr/tel-00382710
Contributor : Helga Szambolics <>
Submitted on : Monday, May 11, 2009 - 10:19:35 AM
Last modification on : Thursday, November 19, 2020 - 1:01:01 PM
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Helga Szambolics. New numerical approaches for micromagnetism and Current-induced domain wall motion. Condensed Matter [cond-mat]. Institut National Polytechnique de Grenoble - INPG, 2008. English. ⟨tel-00382710⟩

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