发表机构
Universidade Federal de Pernambuco; Universidade Federal de Viçosa（伯南布哥联邦大学; 维索萨联邦大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究采用SP-FMR和ST-FMR技术，证实Py/MoTe₂界面的Rashba-Edelstein效应主导自旋-电荷转换，为低功耗自旋电子器件提供了新方案。
AI 中文摘要
过渡金属二硫化物（TMDs）及其Weyl半金属相（如MoTe₂）因具有高效的电荷-自旋转换特性，在自旋轨道力矩应用中受到广泛关注。然而，这种转换主要源自体相还是界面仍不明确。本研究采用自旋泵浦和自旋扭矩铁磁共振（SP-FMR和ST-FMR）探究MoTe₂中的自旋-电荷转换。厚度依赖测量显示，大的自旋-电荷转换及自旋扭矩效率基本与MoTe₂厚度无关，表明该转换主要由Py/MoTe₂界面的Rashba-Edelstein效应主导，而非体相自旋输运。此行为与Pt异质结构中观测到的特征厚度依赖形成对比，双向SP-FMR及界面分离测量进一步验证了这一结论。研究结果强调，Py/MoTe₂界面在基于TMD的自旋电子器件中实现高效自旋-电荷转换及自旋轨道力矩方面起主导作用，表明溅射MoTe₂/Py异质结构在低功耗自旋电子应用（包括磁存储和逻辑器件）中具有潜力。
英文摘要
Transition metal dichalcogenides (TMDs) and their Weyl semimetal phases, such as MoTe$_2$, have attracted significant attention for spin-orbit torque applications due to their efficient charge-to-spin conversion. However, whether this conversion originates predominantly from the bulk or the interface remains unclear. Here, we investigate spin-charge interconversion in MoTe$_2$ using spin-pumping and spin-torque ferromagnetic resonance (SP-FMR and ST-FMR). Thickness-dependent measurements reveal large spin-to-charge conversion and spin-torque efficiencies that are essentially independent of MoTe$_2$ thickness, indicating that the conversion is predominantly governed by the Rashba-Edelstein effect at the Py/MoTe$_2$ interface rather than by bulk spin transport. This behavior contrasts with the characteristic thickness dependence observed in Pt heterostructures and is further supported by bidirectional SP-FMR and interface-separation measurements. Our results highlight the dominant role of the Py/MoTe$_2$ interface in enabling efficient spin-charge conversion and spin-orbit torques in TMD-based spintronic devices. These findings highlight the potential of sputtered MoTe$_2$/Py heterostructures for low-power spintronic applications, including magnetic memory and logic devices.
Comments18 pages, 9 figures
