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Réseaux bidimensionnels d'agrégats magnétiques préformés en phase gazeuse

Abstract : This thesis work focus on the organization of nanoparticles on surfaces by an original approach based on the deposition of preformed nanoclusters in a soft landing process (Bottom-up approach) onto functionalized HOPG-substrate with 2D arrays of defects created by Focused Ion Beam nano-FIB (Top-down approach). To obtain a 2D array of cluster-assembled nanoislands, the deposited nanoclusters must diffuse on the surface and be sensitive to FIB-defects. Then, in order to develop this approach, we first emphasize the predictions of Monte-Carlo simulations including DDA (Deposition-Diffusion-Agregation) model. Next, we successfully test its experimental feasibility by depositing gold preformed nanoclusters. Particularly, this study shows the dependence of morphological and structural properties of FIB-defects on the ion doses. Moreover, the sensitivity of deposited nanoclusters to FIB-defects and the possibility to control the periodicity and the geometry of the nanoparticle arrays as well as the size and the morphology of the cluster-assembled nanoislands were analyzed. Finally, choosing the set of experimental parameters responsible for the nicer organization, we extend our approach to Co50Pt50 magnetic nanoclusters, promising candidates for high-density data storage devices. Post-annealing treatments induce a drastic improvement of the quality of the organization as well as a phase transformation of the supported clusters from A1-phase to the L10-one.
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Contributor : Abdelkrim Hannour <>
Submitted on : Wednesday, April 4, 2007 - 12:00:47 PM
Last modification on : Thursday, October 15, 2020 - 9:00:03 AM
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  • HAL Id : tel-00139982, version 1



Abdelkrim Hannour. Réseaux bidimensionnels d'agrégats magnétiques préformés en phase gazeuse. Matière Condensée [cond-mat]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00139982⟩



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