CoFe2O4>CuFe2O4>NiFe2O4>Fe2O3

It is not entirely clear what the author of the question wanted to know. But if we mean the type of these magnets, then they belong to the class of ferrimagnets having several sublattices (in this case two sublattices) with the opposite direction of the magnetic moments. As a rule, these are double oxides of the MeO*Fe2O3 type. In the crystal structure of spinel ferrites, one sublattice consists of cations located in tetrahedral (A) positions (surrounded by 4 anions), and the other consists of cations filling octahedral [B] sites (surrounded by 6 anions).The structure of a normal spinel has the form Me2+[Fe3+]2O4. At the same time, nickel ferrite, cobalt ferrite and magnetite have a so-called reversed structure with Fe3+ cations in A-sites, and Ni2+, Co2+, Fe2+ together with Fe3+ cations are located in B-nodes. In copper ferrite, the ratio of Cu2+ and Fe3+ cations in the A-positions is ~1:9 (mixed type of structure). The relative magnetization of these substances (at 0 K) can be judged by the magnetic moment of the formula unit, which is for them (in the order indicated in the question) 2 - 3 - 1 - 4 Bohr magnetons (theoretical calculation) or 2,3 - 3,7 - 1,3 - 4,1 Bohr magnetons (experiment). Thus, the magnetic moment of magnetite has the highest value, and the magnetic moment of copper ferrite has the lowest value. Due to the different character of the temperature dependence of the sublattice magnetization, this order may change with increasing temperature, however, for these compositions it remains up to ~450 oC (Fe3O4>CoFe2O4>NiFe2O4>CuFe2O4), after which nickel ferrite begins to overtake cobalt ferrite.

By the way, there is another mistake in the previous answer: Fe2O3 oxide is not magnetite. Its alpha-modification (hematite) does not have a spinel crystal structure, and its magnetic structure can at best be attributed to weak ferromagnets. Gamma-Fe2O3 (maghemite) has a cation-deficient spinel structure; its magnetization is slightly lower than that of magnetite, and it often forms continuous rows of solid solutions with magnetite.