标题：Electric-field control of magnetic properties for α-Fe2O3/Al2O3films
作者：Cheng, Bin ;Qin, Hongwei ;Liu, Liang ;Xie, Jihao ;Zhou, Guangjun ;Chen, Lubin ;Hu, Jifan
作者机构：[Cheng, Bin ;Qin, Hongwei ;Liu, Liang ;Xie, Jihao ;Zhou, Guangjun ;Hu, Jifan ] School of Physics, State Key Laboratory for Crystal Materials, Shandong 更多
来源：Journal of Physics D: Applied Physics
摘要：α-Fe2O3/Al2O3films can exhibit weak ferromagnetism at room temperature. The saturation magnetization of the thinner film is larger than that of the thick one deposited at the same temperature of 500 °C, which implies that the weak ferromagnetism at room temperature comes not only from the intrinsic canted magnetic structure, but also from the effects of interface between α-Fe2O3/Al2O3, such as the effect of Al diffusion into α-Fe2O3film. Perpendicular electric field upon α-Fe2O3/Al2O3film at room temperature could adjust the magnetic properties (saturation magnetization, magnetic remanence, coercivity and saturation magnetizing field). The positive electric field can enhance the magnetism of α-Fe2O3/Al2O3thin film, while negative electric field can reduce it. The change induced by electric field may be connected with the migration effects of Al3+ions. The steps of curve for saturation magnetization versus the electric field may reflect these complicated processes. The magnetization of the film deposited at a higher temperature can be changed by electric field more easily. This study may inspire more in-depth research and lead to an alternative approach to future magneto-electronic devices.
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