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Journal Articles Hyperfine Interactions Year : 2005

Mössbauer and magnetic study of Co x Fe3−x O4 nanoparticles

Abstract

Magnetic nanoparticles of cobalt ferrites Co x Fe3−x O4 (x = 1 or 2) have been obtained either by mechanical milling or thermal treatment of pre-prepared layered double hydroxide carbonate x-LDH–CO3. Mechanical milling of the 1-LDH–CO3 leads to the large-scale preparation of nearly spherical nanoparticles of CoFe2O4, the size of which (5 to 20 nm) is controlled by the treatment time. Core-shell structure with surface spin-canting has been considered for the nanoparticles formed to explain the observed hysteresis loop shift (from ZFC–FC) in the magnetic properties. Annealing treatment of the 2-LDH–CO3 below 673 K results in the formation of nearly spherical pure Co2FeO4 nanoparticles. At 673 K and above, the LDH decomposition leads to the formation of a mixture of both spinels phases Co2FeO4 and CoFe2O4, the amount of the latter increases with annealing temperature. Unusually high magnetic hardness characterized by a 22 kOe coercive field at 1.8 K has been observed, which reflects the high intrinsic anisotropy for Co2FeO4.
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Dates and versions

hal-03601129 , version 1 (08-03-2022)

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Claude Estournès, Céline d'Orléans, Jean Luc Rehspringer, Elina Manova, Boris Kunev, et al.. Mössbauer and magnetic study of Co x Fe3−x O4 nanoparticles. Hyperfine Interactions, 2005, 1 (1-4), pp.61-67. ⟨10.1007/s10751-006-9248-y⟩. ⟨hal-03601129⟩
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