Magnetization dynamics: ultra-fast and ultra-small |
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Authors: | Yves Acremann |
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Institution: | aPULSE Center, Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA |
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Abstract: | 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. To cite this article: Y. Acremann, C. R. Physique 9 (2008). |
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Keywords: | Magnetism Ultrafast Microscopy Synchrotron radiationMots-clé s: Magné tisme Microscopie ultra-rapide Rayonnement synchrotron |
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