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Croissance et propriétés magnétiques de nanostructures épitaxiées auto-assemblées : le système Fe/Mo(110).

Abstract : The aim of the present thesis is the fabrication, using self-assembly technique, of Fe model nanoparticles on Mo(110) and the study of their magnetization reversal. A systematic study of the growth of Fe on Mo(110)/Al2O3(11-20) under ultra high vacuum conditions is presented. The epitaxial technique is Pulsed Laser Deposition. This work provides new information about the growth of Fe thin films, and describes different methods to produce self-assembled/self-organized nanostructures (dots or stripes). Two distinct growth modes are observed as a function of the substrate temperature leading to the formation of two types of model particles : Above Ts>600K, the growth of Fe/Mo(110) results in the formation of 3D compact self-assembled Fe islands. The facetted shape and constant aspect ratios are demonstrated to correspond to the equilibrium shape of an iron crystal. At moderated temperature (300K < Ts < 600K), Fe growth differs because of kinetic limitations. Deposition at 500K, or annealing of continuous films grown at 300K or 400K, results in the formation of Fe nanostripes self-organized along the atomic steps of the slightly vicinal Mo(110) surface. Within this work, the study of the magnetic properties mainly focuses on the magnetic domain configurations and on the reversal behavior of submicronic 3D compact Fe islands. Magnetic characterization of this model system was performed using simultaneously macroscopic techniques, single particle measurements (MFM and micro-squid) and micromagnetic simulations. This multi-technique approach has lead to a precise description of the magnetic domain configurations and on the reversal processes for one single particle, in correlation with its structure and shape which are precisely determined. The magnetic properties of the self-organized nanowires, which present a remanent state, have also been studied from macroscopic measurements by applying a method of separation of the irreversible and reversible contribution to magnetic variation.
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Theses
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https://tel.archives-ouvertes.fr/tel-00004054
Contributor : Pierre-Olivier Jubert <>
Submitted on : Monday, December 22, 2003 - 6:43:26 PM
Last modification on : Friday, December 18, 2020 - 1:22:02 PM
Long-term archiving on: : Friday, April 2, 2010 - 7:54:28 PM

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  • HAL Id : tel-00004054, version 1

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UJF | CNRS

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Pierre-Olivier Jubert. Croissance et propriétés magnétiques de nanostructures épitaxiées auto-assemblées : le système Fe/Mo(110).. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2001. Français. ⟨tel-00004054⟩

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