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Journal Articles Journal of Physical Chemistry C Year : 2017

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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hal-02289035 , version 1 (16-09-2019)

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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, 2017, 121 (20), pp.10713-10718. ⟨10.1021/acs.jpcc.6b10715⟩. ⟨hal-02289035⟩
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