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Croissance et magnétisme de nanostructures organisées sur surfaces cristallines

Abstract : In this work, we investigate the growth of magnetic nanodots arrays, in order to study their magnetic properties. The dots are grown on Au(788), a spontaneously nanostructured template, which enables to obtain an nanodots array with a long range order and a narrow size distribution. We first present our study of the nucleation and growth mechanism on an array of traps. We link the energetic parameters with the temperature range for the organized growth. Then, we study the growth of cobalt and iron nanodots on Au(788). Using a variable temperature Scanning Tunnelling Microscope, we perform an exhaustive growth study versus the substrate temperature. The comparison with multi-scaled calculations (Molecular Dynamics, Kinetic Monte Carlo) enables us to determine the atomistic mechanisms, which leads to the organized growth. In a second part, we focus on the magnetic properties of our nanostructures, and particularly on the link between dots morphology and magnetic anisotropy energy (MAE). We first investigate the limits of the macrospin model using micromagnetic simulations. Then, we experimentally extract the MAE distribution from the hysteresis loops, measured at different temperatures. The comparison with the size distribution shows a non trivial relation between size and MAE.
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https://tel.archives-ouvertes.fr/tel-00010738
Contributor : Stanislas Rohart <>
Submitted on : Tuesday, October 25, 2005 - 8:45:42 AM
Last modification on : Monday, November 9, 2020 - 11:35:09 AM
Long-term archiving on: : Friday, September 14, 2012 - 3:15:11 PM

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  • HAL Id : tel-00010738, version 1

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Stanislas Rohart. Croissance et magnétisme de nanostructures organisées sur surfaces cristallines. Matière Condensée [cond-mat]. Université Paris-Diderot - Paris VII, 2005. Français. ⟨tel-00010738⟩

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