发表机构
Nanyang Technological University（南洋理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过引入可控RuPt混合层将Ru/Pt界面从突变调整为梯度，发现0.26 nm混合厚度使类阻尼转矩效率提升15%（对比Pt参考提升70%），归因于轨道传输增强与退相干竞争，为优化轨道电子学器件提供新途径。
AI 中文摘要
轨道电子学已成为一种通过轨道霍尔效应利用低成本、丰富材料产生轨道电流的有前景的方法。由于轨道电流无法直接与常规铁磁体的局域磁化相互作用，需要具有强自旋轨道耦合的非磁性层将轨道电流转换为自旋电流。然而，轨道电流在轨道源与轨道-自旋转换器之间的界面传播仍知之甚少。在此，我们通过引入可控的RuPt混合层，将Ru/Pt轨道界面从突变界面调整为梯度界面，并量化了由此产生的类阻尼转矩效率。与突变的Ru/Pt界面相比，0.26 nm的小混合厚度将类阻尼转矩效率提高了15%，与Pt参考相比提高了70%。进一步增加混合厚度会逐渐抑制转矩效率。我们将这种非单调行为归因于通过逐渐晶体场转变增强的轨道传输与由于合金无序和散射导致的轨道电流退相干之间的竞争。我们的结果表明，轨道源/转换器界面是控制轨道传输的主动元素，并为优化轨道电子学异质结构中的轨道电流传输和转矩产生提供了一种实验上可访问的方法。
英文摘要
Orbitronics has emerged as a promising approach for generating orbital currents using low cost, abundant materials through the orbital Hall effect. Since orbital current cannot directly interact with the local magnetization of a conventional ferromagnet, a non-magnetic layer with strong spin orbit coupling is required for converting orbital current into spin current. However, the propagation of orbital current across the interface between an orbital source and an orbital to spin converter remains poorly understood. Here, we tuned the Ru/Pt orbital interface from an abrupt interface to a graded interface by introducing a controlled RuPt intermixed layer and quantified the resulting damping like torque efficiencies. A small, intermixed thickness of 0.26 nm enhances the damping like torque efficiency by 15% compared with the abrupt Ru/Pt interface and by 70% compared with the Pt reference. Further increasing the intermixing thickness progressively suppresses the torque efficiency. We attribute this nonmonotonic behavior to the competition between enhanced orbital transmission through a gradual crystal field transition and orbital current dephasing due to alloy disorder and scattering. Our results demonstrate that the orbital-source/converter interface is an active element for controlling orbital transport and provides an experimentally accessible approach for optimizing orbital current transmission and torque generation in orbitronic heterostructures.
Comments15 Pages, 4 Figures, Research Article
