Magneto-optical Faraday effect has been investigated for 3d -transition-metal-substituted titania nanosheets Ti1-xM xO2 (M=Fe,Co). In Ti0.8 Co0.2O 2 and Ti0.6 Fe0.4O2 nanosheets, a strong magneto-optical response (∼ 104 deg/cm) appeared near the absorption edge at 260 nm. We find that tailoring magneto-optical properties could be achieved by (FeCo) cosubstitution and an optimally doped Ti 0.75 Fe0.1Co0.15O2 nanosheet exhibits a gigantic magneto-optical response (∼ 105 deg/cm) over the wide wavelength region (400-750 nm). By analyzing electronic structures from first-principle calculations, we have clarified that the d-d transitions are responsible for the gigantic signal in (FeCo) -cosubstituted nanosheets.
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