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Nanostructures auto-assemblées : des systèmes modèles pour le micromagnétisme de parois magnétiques

Abstract : The aim of this work is to control, using an external magnetic field, the internal structure of a magnetic domain wall. We chose to work on the asymmetric Bloch wall that has been studied in a model system : epitaxial self-assembled Fe(110) dots. We have evidenced the reversal of an internal degree of freedom of the domain wall : the orientation of the Néel caps that terminate the domain wall at both surfaces. This has been observed
statistically at remanence after applying an external magnetic field using XMCD-PEEM magnetic
microscopy, in quantitative agreement with micromagnetic simulations. Preliminary results of the direct observation of this phenomenon have been obtained using Lorentz microscopy. A magneto-transport study has been conducted on individual dots as a function of temperature. To do so, a procedure based on electronic lithography technique to contact individual dots has been developed. On the same experimental system, we have carried out
a complementary study of the transition between a domain wall (2D) and a magnetic vortex (1D) that has been shown to be of second order kind. The transition and stochastic fluctuations between a domain wall and a vortex have been evidenced using Lorentz microscopy.
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Contributor : Fabien Cheynis <>
Submitted on : Thursday, March 6, 2008 - 10:04:46 AM
Last modification on : Thursday, December 3, 2020 - 12:44:03 PM
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  • HAL Id : tel-00261038, version 1




Fabien Cheynis. Nanostructures auto-assemblées : des systèmes modèles pour le micromagnétisme de parois magnétiques. Matière Condensée [cond-mat]. Institut National Polytechnique de Grenoble - INPG, 2007. Français. ⟨tel-00261038⟩



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