Investigation of the chemical structure of core-shell Fe<sub>3</sub>O<sub>4</sub>@Ni<sub>1-<i>x</i></sub> Co <sub><i>x</i></sub> Fe<sub>2</sub>O<sub>4</sub> nanoparticles and its influence on their magnetic properties.

Note that even if there is an overall trend in M s values, this magnitude is strongly dependent of surface effect and exact AFM content that lowers their magnetization with respect to the bulk value of magnetite. 66 Reduced remanence magnetization ( M R / M S ) values, plotted in Fig. 6b for the ZFC and FC loops (and listed in Table 3 ) increase with Co content (or, alternatively, decrease with Ni fraction).

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