Chu Ruiyue, Liu Liang, Cui Bin, Liu Weikang, An Taiyu, Ren Xue, Miao Tingting, Cheng Bin, Hu Jifan
School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China.
ACS Nano. 2022 Oct 25;16(10):16077-16084. doi: 10.1021/acsnano.2c04297. Epub 2022 Sep 21.
The manipulation of charge-to-spin current conversion and spin-orbit torque (SOT) is of great interest due to its profound physics and potential applications. Controlling the spin current through the electric field provides a perspective for highly efficient SOT devices. Here, we use HO-doped ionic liquid gating to realize the reversible and nonvolatile manipulation of the spin Hall effect of Pt, and the spin Hall angle can be modulated by 48% within an accessible gate voltage range. The increase in the spin Hall angle is demonstrated to be caused by the adsorption of hydrogen ions on the Pt surface and the consequent enhancement of the spin Hall conductivity under positive voltage. Furthermore, the enhancement of the spin Hall angle is beneficial to reduce the critical current density for driving the domain wall motion. These results supply a method for the dynamic control of the charge-to-spin current conversion, which will promote the development of spintronic devices driven by electric fields.
电荷到自旋电流转换以及自旋轨道矩（SOT）的操控因其深刻的物理原理和潜在应用而备受关注。通过电场控制自旋电流为高效SOT器件提供了一种思路。在此，我们利用掺钬离子液体门控实现了对Pt自旋霍尔效应的可逆且非易失性操控，并且在可及的门电压范围内自旋霍尔角可被调制48%。自旋霍尔角的增加被证明是由氢离子在Pt表面的吸附以及随之而来的正电压下自旋霍尔电导率的增强所导致的。此外，自旋霍尔角的增强有利于降低驱动畴壁运动的临界电流密度。这些结果提供了一种动态控制电荷到自旋电流转换的方法，这将推动电场驱动的自旋电子器件的发展。
