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Structure and Magnetic Properties of FeCo Clusters: Carbon Environment and Annealing Effects

Abstract : In this article, we study the thermally activated chemical order transition in FeCo nanoalloys prepared by low energy clusters beam deposition (LECBD). Due to the low Z-contrast (ΔZ = 1) between Fe and Co atoms, a particular strategy based on extended X-ray absorption edge fine structure (EXAFS) experiments and simulations at both Fe and Co K-edges has been developed as well as accurate magnetic characterizations on as-prepared and annealed FeCo clusters embedded in a carbon matrix. We show that upon annealing crystallographic order and magnetic properties are improved, but we are not able to detect without ambiguity the B2 (CsCl-type) chemical order as expected in bulk-like phase, due to competition between stable iron carbide formation and cobalt–carbon demixing in bimetallic nanoparticles.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02289035
Contributor : Depot 3 Lyon 1 <>
Submitted on : Monday, September 16, 2019 - 12:07:02 PM
Last modification on : Thursday, October 15, 2020 - 8:54:03 AM

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Ghassan Khadra, Alexandre Tamion, Florent Tournus, Olivier Boisron, Clément Albin, et al.. Structure and Magnetic Properties of FeCo Clusters: Carbon Environment and Annealing Effects. Journal of Physical Chemistry C, American Chemical Society, 2017, 121 (20), pp.10713-10718. ⟨10.1021/acs.jpcc.6b10715⟩. ⟨hal-02289035⟩

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