Magnetization dynamics: ultra-fast and ultra-small

Yves Acremann

doi:10.1016/j.crhy.2007.05.017

Magnetization dynamics: ultra-fast and ultra-small
[Dynamique de magnétisation : ultra-rapide et ultra-petit]

Yves Acremann ¹

¹ PULSE Center, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA

Comptes Rendus. Physique, Synchrotron x-rays and condensed matter, Volume 9 (2008) no. 5-6, pp. 585-594.

Résumé
Abstract

Les processus magnétiques ultra-rapides sont d'un grand intérêt scientifique mais ils sont aussi à la base des applications en matière d'enregistrement magnétique à haute densité. Nous démontrons les capacités uniques de la microscopie X magnétique à haute résolution et résolue en temps et prouvons que le mouvement du cœur d'un vortex magnétique peut être imagé. La direction prise par le cœur reste inaccessible à la plupart des techniques expérimentales mais elle a une influence déterminante sur la dynamique de la structure magnétique.

A l'aide de la microscopie X résolue en temps, nous avons imagé le basculement d'une nanostructure ferromagnétique induit par une impulsion de courant polarisée en spin. A la différence du processus habituel de basculement décrit par Néel et Stoner–Wohlfarth, la magnétisation des dispositifs à injection de spin ne bascule pas uniformément mais implique le déplacement d'un vortex magnétique.

Ultrafast magnetic processes are of great scientific interest but also form the basis of high density magnetic recording applications. We demonstrate the uniqueness of time resolved, high resolution magnetic X-ray microscopy, and show that the motion of a magnetic vortex core can be imaged. The vortex core direction is hidden to most experimental techniques, but has a decisive influence on the dynamics of the magnetic structure.

We imaged the switching of a ferromagnetic nanostructure by a spin polarized current pulse using time resolved X-ray microscopy. As opposed to the common uniform switching process due to Néel and Stoner–Wohlfarth, the magnetization in spin injection devices does not switch uniformly, but involves the motion of a magnetic vortex.

Publié le : 2007-10-25

DOI : 10.1016/j.crhy.2007.05.017

Keywords: Magnetism, Ultrafast Microscopy, Synchrotron radiation
Mots-clés : Magnétisme, Microscopie ultra-rapide, Rayonnement synchrotron

Affiliations des auteurs :

Yves Acremann ¹

¹ PULSE Center, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA

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     title = {Magnetization dynamics: ultra-fast and ultra-small},
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     pages = {585--594},
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Yves Acremann. Magnetization dynamics: ultra-fast and ultra-small. Comptes Rendus. Physique, Synchrotron x-rays and condensed matter, Volume 9 (2008) no. 5-6, pp. 585-594. doi : 10.1016/j.crhy.2007.05.017. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.05.017/

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