As explained by Nguyen et al., 2021, "Fe3O4 has attracted more attention than other iron oxides or ferrite spinel oxides (MFe2O4 with M = Co, Ni, Mg, etc.) because of its superior magnetic properties, electronic conductivity, and biocompatibility". We can explain the magnetism of magnetite with its crystal structure. "Magnetite has a cubic inverse spinel crystal structure consisting of Fe 2+ cations occupying 25% of the octahedral interstitial sites and Fe 3+ cations occupying 25% of the octahedral sites and 12.5% of the tetrahedral sites, and thirty-two O 2-anions in its unit cell" (Ngyen et al., and references therein).