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Quasi-2D magnetophotonic crystals (MPCs) comprising bismuth-substituted yttrium iron garnet/silicon dioxide multilayers were fabricated on top of 1D structured substrates and evaluated. Optical and magneto-optical (MO) spectra showed that light coupling to the structure of these MPCs happened in multiple Bragg diffraction regimes, where a mixing of modes with resonant wavelengths occurred within MPCs and a demultiplexing phenomenon was observed. Responses from the crystals were studied in transmission and diffraction geometries. We show that nano-scale tailoring of MPCs’ structure allows one to increase significantly the MO efficiency of magnetic materials and invert their natural MO responses.