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Dynamique de l'aimantation : d'un film simple aux systèmes couplés

Abstract : The first part of this thesis describes the magneto-optical effects (from visible light to X-rays), the ways to produce dynamical magnetic fields and the different magnetometres that have been developed. These instruments allow studying dynamics over a time scale from 50 ps to several hours, with a spatial resolution down to 100 nm. The second part is dedicated to a short presentation of magnetism and theoretical approaches to magnetization dynamics. The third part presents studies on a garnet film, where the dynamics is dominated by precessional effects, and a Co/Pt multilayer where thermally activated effects (nucleation, propagation) dominate. In the fourth and final part, I start with the presentation of a study on coupled ferro/antiferromagnetic Co/NiO bilayers. Then results of a study on the disappearance of the magnetostatic orange-peel coupling at high reversal speed in ferromagnetic/non-magnetic/ferromagnetic trilayers deposited on step-bunched substrates are presented.
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Submitted on : Tuesday, January 25, 2005 - 10:25:53 AM
Last modification on : Friday, December 18, 2020 - 1:22:02 PM
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  • HAL Id : tel-00008241, version 1




Yan Pennec. Dynamique de l'aimantation : d'un film simple aux systèmes couplés. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00008241⟩



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