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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2009

Superferromagnetism in mechanically alloyed fcc Fe23Cu77 with bimodal cluster size distribution

Résumé

Magnetic measurements, x-ray diffraction and Mössbauer spectroscopy were used to characterize a nanostructured fcc Fe23Cu77 at.% alloy prepared by high-energy ball-milling, addressing in particular the effect of clustering on the nature of the interacting magnetic entities. The interpretation of magnetization measurements leads to the conclusion that grains, whose mean size is ~16 nm, contain two populations of magnetic Fe-rich nanoclusters with a bimodal size distribution. These two sets of clusters contain about 14 and 400 Fe atoms and have magnetic moments of 30 µB and 860 µB, respectively. The inter-cluster ferromagnetic interactions that lead to superferromagnetism with a Curie temperature TC~220 K can be described by a mean field determined by the smaller clusters only, which account for 90% of the magnetization.
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Dates et versions

hal-00664740 , version 1 (31-01-2012)

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Nuno João Silva, João Cunha de Sequeira Amaral, Vitor Brás Sequeira Amaral, Maria Benilde Faria de Oliveira E Costa, Gérard Le Caër. Superferromagnetism in mechanically alloyed fcc Fe23Cu77 with bimodal cluster size distribution. Journal of Physics: Condensed Matter, 2009, 21 (4), pp.6003. ⟨10.1088/0953-8984/21/4/046003⟩. ⟨hal-00664740⟩
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