What is the crystallographic structure of CeFe2O4, and its lattice parameters. Definitely you have to use single crystal substrates, which are no doubt costly.
spinel oxide can be grown on single crystals substrates. Such experiments were already done on Si(111) surfaces.
But spinel oxides, especially CoFe2O4, can be also grown easily on conventional glass substrates. You can have a look on the attached papers for example.