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Alliage antiferromagnétique MnPt : croissance, propriétés magnétiques et structurales

Abstract : Molecular-beam epitaxy growth of MnPt/Pt (100) has been studied. The MnPt alloy, chemically-ordered with L10 structure, has beeen elaborated by codeposition and by a multilayer method. The codeposition leads to a twinned structure with in-plane tetragonal axis. The multilayer method gives rise to a favoured out-of-plane orientation of the tetragonal axis. The magnetic structure of each of the two deposited alloys has been characterized. Exchange-coupled Fe/MnPt and FeNi/MnPt bilayers have been elaborated. Due to the competition between intrinsic anisotropies and exchange anisptropy, the angular behaviour of magnetic properties (coercive field and exchange bias) of the ferromagnetic layer shows a complex evolution and an induced anisotropy. A model of total energy has been used to interpret the experimental data. In-field magnetic-force microscopy study of the magnetization shows distinct reversal mechanisms according to the respective orientation of the field and anisotropies. At a low scale, anisotropy competition leads to the appearance of magnetic ripples. The latter have been observed and modelled. The effect of light ion irradiation on the structure has also been investigated.
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Contributor : Jérôme Borme <>
Submitted on : Monday, July 2, 2007 - 11:25:39 AM
Last modification on : Wednesday, November 4, 2020 - 2:46:36 PM
Long-term archiving on: : Monday, September 24, 2012 - 10:51:52 AM


  • HAL Id : tel-00159060, version 1



Jérôme Borme. Alliage antiferromagnétique MnPt : croissance, propriétés magnétiques et structurales. Matière Condensée [cond-mat]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00159060⟩



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