Micromagnetic study of flux-closure states in Fe dots using quantitative Lorentz Microscopy

Abstract : A micromagnetic study of epitaxial micron-sized iron dots is reported through the analysis of Fresnel contrast in Lorentz Microscopy. Their use is reviewed and developed through analysis of various magnetic structures in such dots. Simple Landau configuration is used to investigate various aspects of asymmetric Bloch domain walls. The experimental width of such a complex wall is first derived and its value is discussed with the help of micromagnetic simulations. Combination of these two approaches enables us to define what is really extracted when estimating asymmetric wall width in Lorentz Microscopy. Moreover, quantitative data on the magnetization inside the dot is retrieved using phase retrieval as well as new informations on the degrees of freedom of such walls. Finally, it is shown how the existence and the propagation of a surface vortex can be characterized and monitored. This demonstrates the ability to reach a magnetic sensitivity a priori hidden in Fresnel contrast, based on an original image treatment and backed-up by the evaluation of contrasts obtained from micromagnetic simulations.
Type de document :
Article dans une revue
Ultramicroscopy, Elsevier, 2012, 115, pp.24-36. <10.1016/j.ultramic.2012.02.002>
Liste complète des métadonnées

Contributeur : Aurélien Masseboeuf <>
Soumis le : vendredi 16 décembre 2011 - 09:22:04
Dernière modification le : mardi 1 mars 2016 - 12:47:32
Document(s) archivé(s) le : samedi 17 mars 2012 - 02:21:09


Fichiers produits par l'(les) auteur(s)




Aurélien Masseboeuf, Fabien Cheynis, Olivier Fruchart, Pascale Bayle-Guillemaud, Jean-Christophe Toussaint, et al.. Micromagnetic study of flux-closure states in Fe dots using quantitative Lorentz Microscopy. Ultramicroscopy, Elsevier, 2012, 115, pp.24-36. <10.1016/j.ultramic.2012.02.002>. <hal-00594382v2>



Consultations de
la notice


Téléchargements du document