Magnetization and ZFC/FC datasets for CoFe2O4 and CoFe2O4@NiFe2O4 nanoparticles

This dataset contains magnetization measurements of CoFe₂O₄ (CFO) and CoFe₂O₄@NiFe₂O₄ (CFO@NFO) nanoparticles used to investigate magnetic size, spin disorder, and magnetic coherence effects in exchange-coupled bi-magnetic nanoarchitectures. The dataset includes:(i) magnetization curves M(H) measured at 300 K, used for Langevin analysis and extraction of magnetic size distributions;(ii) zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves M(T,H), employed to analyze blocking behavior and magnetic correlation effects. Measurements were performed on nanoparticle powders using SQUID magnetometry (as described in the associated publication). The data support the analysis of magnetic size, saturation magnetization, and correlation length within the random-anisotropy (RAM) framework. These data are associated with a manuscript submitted to Journal of Applied Physics.