论文标题
原子上薄金属异质结构中的大型界面Rashba相互作用和巨大的自旋轨道扭矩
Large interfacial Rashba interaction and giant spin-orbit torques in atomically thin metallic heterostructures
论文作者
论文摘要
在过去的十年中，自旋轨道相互作用将电荷电流转化为自旋电流的能力（最常在重金属薄膜中最常见）一直是Spintronics的标志。在这项研究中，我们演示了轻质金属元件界面的插入如何深刻影响自旋轨道扭矩的性质及其在类似阻尼（$ h _ {\ text {dl}} $）方面的效率（$ h _ {\ text {dl}} $）和类似field的（$ h _ {\ h_ {\ text {flet {flext {flext {flext {flex {flex {flex}} $）有效领域。 Indeed, we measure unexpectedly large $H_{\text{FL}}$/$H_{\text{DL}}$ ratio ($\sim$2.5) upon inserting a 1.4 nm thin Al layer in Pt|Co|Al|Pt as compared to a similar stacking including Cu instead of Al.从我们的建模中，这些结果强烈证明在Co | al界面上存在大型Rashba相互作用，该界面产生了巨大的$ h _ {\ text {fl}} $，这是从金属接口中预期的。通过证明电流诱导的磁化反转显示出切换的临界电流显着下降，从界面起源进行了这种增强的扭矩。
The ability of spin-orbit interactions to convert charge current into spin current, most often in the bulk of heavy metal thin films, has been the hallmark of spintronics in the last decade. In this study, we demonstrate how the insertion of light metal element interface profoundly affects both the nature of spin-orbit torque and its efficiency in terms of damping-like ($H_{\text{DL}}$) and field-like ($H_{\text{FL}}$) effective fields in ultrathin Co ferromagnet. Indeed, we measure unexpectedly large $H_{\text{FL}}$/$H_{\text{DL}}$ ratio ($\sim$2.5) upon inserting a 1.4 nm thin Al layer in Pt|Co|Al|Pt as compared to a similar stacking including Cu instead of Al. From our modelling, these results strongly evidence the presence of large Rashba interaction at Co|Al interface producing a giant $H_{\text{FL}}$, which was not expected from a metallic interface. The occurrence of such enhanced torques from an interfacial origin is further validated by demonstrating current-induced magnetization reversal showing a significant decrease of the critical current for switching.
