Ferromagnetic Properties in Co-substituted Titania Nanosheets

摘要

Two-dimensional (2D) Ti_(1-x)Co_xO_2 nanosheet, a recently discovered ferromagnic nanomaterial, has been investigated by magnetic and magneto-optical measurements. The multilayer films of Ti_(0.8)Co_(0.2)O_2 nanosheets exhibit room-temperature ferromagnetism with magnetic moment of 1.4 μ_B/Co. We also observe robust magnetic circular dichroism near the absorption edge at 4 eV, indicating a strong spin polarization in this 2D system. The first-principles study of Ti_(1-x)Co_xO_2 nanosheet characterizes the ferromagnetic state with a spin-orbit-induced anisotropy.