Zhang W, Chen R, Jiang B, Zhao X, Zhao W, Yan S S, Han G, Yu S, Liu G, Kang S
School of Physics, State Key Laboratory of Crystal Material, Shandong University, Jinan 250100, China.
Fert Beijing Institute, School of Microelectronics, Beijing Advanced Innovation Center for Big Data and Brain Computing, Beihang University, Beijing 100191, China.
Nanoscale. 2021 Feb 4;13(4):2665-2672. doi: 10.1039/d0nr06488b.
The interfacial Dzyaloshinskii-Moriya interaction (i-DMI) has been exploited in as-made symmetrical Au/[Fe/Au]n structures. By tailoring the chirality of the i-DMI at the Au/Fe interface, an overall enhancement of the i-DMI can be obtained in such a symmetrical structure. Furthermore, the tunability of the i-DMI was realized by changing the stacking number n. Compared to the top of Fe, a large tensile stress at the bottom of Fe due to lattice mismatch was responsible for the chirality change in the sub/Au/Fe system. Layer-resolved DMI calculations revealed that the sign of the spin-orbit coupling (SOC) energy was changed for Au near the interface of Au/Fe under tensile stress, subsequently reversing the chirality of the i-DMI from left-handed to right-handed. Our findings provide a simplest way to tune the i-DMI in a multilayer system, further benefiting the application of skyrmion-based devices.
界面Dzyaloshinskii-Moriya相互作用（i-DMI）已在制备好的对称Au/[Fe/Au]n结构中得到应用。通过调整Au/Fe界面处i-DMI的手性，在这种对称结构中可以实现i-DMI的整体增强。此外，通过改变堆叠数n实现了i-DMI的可调性。与Fe顶部相比，由于晶格失配导致Fe底部出现较大的拉应力，这是导致sub/Au/Fe系统手性变化的原因。层分辨DMI计算表明，在拉应力作用下，Au/Fe界面附近Au的自旋轨道耦合（SOC）能量符号发生变化，随后i-DMI的手性从左旋变为右旋。我们的研究结果提供了一种在多层系统中调节i-DMI的最简单方法，进一步有利于基于斯格明子的器件的应用。
