Introduction . Spinel ferrites in the general formula of AFe 2 O 4 , in which A is a divalent metal (Mg, Co, Ni, Zn, Fe, Mn, etc.), are the most widely magnetic nanoparticles (MNPs) due to their outstanding properties such as high permeability and high electrical resistivity1 , 2, and thus, have many applications3 , 4. Ferrite structure, including both M and Fe ions, can inform richer redox reactions in comparison to the single-metal oxides2 , 5. Among spinel ...