Dynamique du déplacement de parois magnétiques dans les couches ultra-minces à forte interaction spin-orbite

Abstract : The study of current-induced magnetic domain wall motion has attracted a lot of attention in recent years, especially since new memory devices based on this effect have been proposed. Recently, a new mechanism allowing for highly efficient current-induced domain wall motion has been discovered in ultrathin asymmetric materials with perpendicular magnetic anisotropy and high spin-orbit coupling. However the understanding of this mechanism, named spin-orbit torque, and of its effect on domain wall motion are still very incomplete. The objective of this work was to study the influence of this spin-orbit torque on domain wall motion. For that, I have studied field- and current-induced domain wall motion in Pt/Co/AlOx. An in-plane static magnetic field has been used to modify the internal domain wall structure and then modulate the action of the SOT on the domain wall dynamics. This work allowed highlighting the existence of a "chiral" effect in the domain-wall dynamics of this system. In order to explain this result, we have proposed a new kind of domain wall structure, resulting from Dzyaloshinskii-Moriya interaction in materials with perpendicular magnetic anisotropy and high spin-orbit coupling. Using analytic calculations and micro-magnetic simulations, this domain wall dynamics has been studied and compared to the experimental results. The disagreements that we have then observed led us to propose a second interpretation based on the presence of an anisotropic damping mechanism.
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  • HAL Id : tel-01022827, version 1

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Emilie Jué. Dynamique du déplacement de parois magnétiques dans les couches ultra-minces à forte interaction spin-orbite. Autre [cond-mat.other]. Université de Grenoble, 2013. Français. ⟨tel-01022827v1⟩

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