Electric-field control of magnetic properties for amorphous Fe2O3/LiTaO3 thin film

Abstract

Amorphous-Fe₂O₃/LiTaO₃ film can exhibit weak ferromagnetism, which may arise from some inhomogeneous, non-collinear, ferromagnetic ordered clusters with short range order. A perpendicular electric field acting upon amorphous-Fe₂O₃/LiTaO₃ film could adjust its magnetic properties at 300 K. The saturation magnetization (M_s) of amorphous-Fe₂O₃/LiTaO₃ film could be enhanced by a positive electric field and reduced by a negative electric field. The change induced by an electric field, which was reversible and non-volatile, may be connected with the migration effects of Li⁺. The oscillation of the curve for the M_s dependent on the voltage may reflect complicated processes. These remarkable and important findings may inspire more in-depth research, and lead to an alternative approach to future magneto-electronic devices.