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Nanostructures magnétiques auto-organisées: le cas du cobalt sur les surfaces vicinales de l'or (111)

Abstract : The experimental study of nanostructures is one field of great interest in actual solid state physics since nanostructures are expected to exhibit some new structural and physical properties. Vicinal surfaces consisting in a regular array of atomic steps give the opportunity either to obtain a 1D nanostructured substrates or to stabilize some surface reconstructions to provide 2D long-range ordered nanopatterned substrates. We first present a complete study of the organized growth of cobalt nanodots on reconstructed vicinal gold substrates. A variable temperature tunnel microscopy study coupled to multi-scaled simulations allows us to elucidate the atomic mechanisms of the organized growth. We perform magneto-optical measurements on these cobalt nano-dots in order to study their super-paramagnetism behavior and to determine their magnetic anisotropy. In a second time we point out the dramatic effect of the atomic steps on the cobalt layer structure. We perform grazing incidence X ray diffraction to characterize the structure of ultra-thin cobalt films deposited on gold vicinal substrate with a high density of steps. In the frame of a probabilistic model of stacking faults we interpret these measurements and conclude to a face centered cubic structure for the cobalt films. The magnetic properties of these cobalt layers reveal a modified magnetic anisotropy that we link to their structure and to the vicinality of the substrate.
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https://tel.archives-ouvertes.fr/tel-00004422
Contributor : Grégory Baudot <>
Submitted on : Friday, January 30, 2004 - 2:36:06 PM
Last modification on : Thursday, December 10, 2020 - 10:52:45 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:32:34 PM

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  • HAL Id : tel-00004422, version 1

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Grégory Baudot. Nanostructures magnétiques auto-organisées: le cas du cobalt sur les surfaces vicinales de l'or (111). Matière Condensée [cond-mat]. Université Paris-Diderot - Paris VII, 2003. Français. ⟨tel-00004422⟩

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