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Résonance ferromagnétique et structure de nanoparticules bimétalliques à base de fer

Abstract : The aim of this study is to show the relevance of ferromagnetic resonance to the problem of nanoparticle magnetism. Research in nanomagnetism involves strongly connected basic and applied issues, requiring a careful study of the new properties exhibited by nanomaterials. This is the case with iron-based bimetallic alloys subjected to reduced dimension. Among the available methods for probing the magnetic properties of nanoparticles, ferromagnetic resonance carried out as a function of temperature presents the advantage of being sensitive simultaneously to the size distribution, magnetic anisotropy and magnetization. At the same time, x-ray absorption and diffraction as well as electron diffraction measurements were carried out in order to determine the chemical and crystalline composition of the nanoparticles as a function of temperature. The combined use of these techniques shows clearly the appearance within the nanoparticles of an exchange coupling between a bimetallic core with strong magnetocrystalline anisotropy and a shell made up of a magnetic iron oxide with an elevated Curie temperature.
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https://tel.archives-ouvertes.fr/tel-00195244
Contributor : Romain Fleurier <>
Submitted on : Monday, December 10, 2007 - 11:54:08 AM
Last modification on : Tuesday, February 2, 2021 - 3:14:03 PM
Long-term archiving on: : Monday, April 12, 2010 - 6:45:00 AM

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  • HAL Id : tel-00195244, version 1

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Romain Fleurier. Résonance ferromagnétique et structure de nanoparticules bimétalliques à base de fer. Matière Condensée [cond-mat]. Université d'Orléans, 2006. Français. ⟨tel-00195244⟩

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