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Croissance, structure et magnétisme dans les systèmes à décalage d'échange FM/AFM : approche fondamentale par la physique des surfaces

Abstract : Our aim is to study the interaction of antiferromagnetic and ferromagnetic materials with well-defined interface by combining structural, electronic and magnetic techniques using synchrotron light. Our interest is guided by the exchange bias effect in thin ferromagnetic films with perpendicular magnetic anisotropy. The main systems studied in this work were ultra-thin layers of chemically-ordered alloys of FePt and MnPt on Pt(001) and of Fe/Ag(001), eventually coupled to CoO. Our strategy was to find an appropriate surface and, for each coupled bilayer, study the individual growth of each element, alloy or oxide. By controlling a variety of parameters, such as surface structure, cleanliness, deposition rate and temperature, we have got a good understanding of the growth process. The coupled systems obtained were studied in situ by grazing incidence X-ray diffraction and ex situ by magneto-optic Kerr effect, X-ray magnetic circular dichroism and X-ray absorption spectroscopy. The relation between the exchange coupling, which manifests itself by an increase in coercivity and a bias field, and the structural characteristics was discussed for the MnPt/FePt and CoO/Fe interfaces.Keywords: exchange bias, chemically ordered alloy, MnPt, FePt, Fe/Ag(001), surface X-ray diffraction, X-ray absorption, MOKE, synchrotron.
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https://tel.archives-ouvertes.fr/tel-00603754
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Submitted on : Monday, June 27, 2011 - 12:08:27 PM
Last modification on : Thursday, November 19, 2020 - 1:01:04 PM
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  • HAL Id : tel-00603754, version 1

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Marcio Medeiros Soares. Croissance, structure et magnétisme dans les systèmes à décalage d'échange FM/AFM : approche fondamentale par la physique des surfaces. Autre [cond-mat.other]. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENY022⟩. ⟨tel-00603754⟩

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