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Elaboration et caracterisation de nanostructures magnetiques

Abstract : This work is dedicated to the study of magnetic and structural properties of different kinds of magnetic nanostructures like: electrodeposited Co nanowires, circular and square dots. In the first part of this thesis, the effects of the electrolytic bath acidity (pH) and deposition current on the magnetic properties in arrays of electrodeposited nanowires and their correlation with the crystalline properties have been studied. In the second part, we were interested by the influence of dipolar interaction on the magnetic properties in circular and square dots. We prove, in the case of circular dots, that it is possible to control the vortex chirality if we arrange the dots in certain configurations. We analysed three different kinds of arrays: two dots chains, zig- zag chains and hexagonal structure. In the case of square and circular dots we distinguish the present of an anisotropy of nucleation field and annihilation field. This anisotropy consists in a variation of nucleation and annihilation field with the angle between the magnetic field and the chain axes.
Mots-clés : magnetisme nanostructures
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Contributor : Adriana Popa <>
Submitted on : Wednesday, October 26, 2005 - 3:04:25 PM
Last modification on : Wednesday, November 4, 2020 - 2:45:15 PM
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  • HAL Id : tel-00010782, version 1



Adriana Paula Popa. Elaboration et caracterisation de nanostructures magnetiques. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2004. Français. ⟨tel-00010782⟩



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