反铁磁 RuO$_2$ 中的自旋劈裂通过主导的面外自旋极化实现无场自旋轨道矩翻转
Spin Splitting in Altermagnetic RuO$_2$ Enables Field-free Spin-Orbit Torque Switching via Dominant Out-of-Plane Spin Polarization
AI总结：
本研究发现交替磁材料RuO₂的自旋劈裂效应可产生面外自旋极化，实现无外场的Co/Pt层自旋轨道矩翻转，为自旋电子器件应用提供新途径。
摘要：
研究人员近期发现了一类新型磁性，称为“altermagnetism（交替磁性）”，兼具铁磁性与反铁磁性的特征。本文报道了在 RuO$_2$ (101)/Co/Pt/Co/Pt/Ta 结构中实现高效无场自旋轨道矩（SOT）翻转的突破性发现。结果表明，面内电荷电流诱导的自旋电流沿[100]轴流动，自旋极化方向与奈尔矢量平行。这些z极化自旋产生面外反阻尼矩，无需外部磁场即可实现 Co/Pt 层的确定性翻转。RuO$_2$ 中的交替磁自旋劈裂效应（ASSE）促进了具有显著各向异性的自旋电流产生，当电荷电流沿[010]方向流动时效应达到最大。这种独特特性实现了最高的无场翻转比率，在约400 Oe的外场范围内保持稳定的SOT翻转。值得注意的是，ASSE主导自旋电流，尤其当电流沿[010]方向（θ = 90°）时。此时自旋极化分量产生显著的类场有效场，超过了来自的类阻尼场。这凸显了在提升自旋矩效率及阐明该晶体环境中自旋流调控机制方面的关键作用。本研究凸显了 RuO$_2$ 作为高效自旋电流产生源的潜力，为自旋矩翻转技术及其他前沿自旋电子器件的实际应用铺平了道路。
英文摘要：
Researchers have recently identified a novel class of magnetism, termed "altermagnetism", which exhibits characteristics of both ferromagnetism and antiferromagnetism. Here, we report a groundbreaking discovery of efficient field-free spin-orbit torque (SOT) switching in a RuO$_2$ (101)/Co/Pt/Co/Pt/Ta structure. Our results demonstrate that the spin current flows along the [100] axis, induced by the in-plane charge current, with the spin polarization direction aligned parallel to the Néel vector. These z-polarized spins generate an out-of-plane anti-damping torque, enabling deterministic switching of the Co/Pt layer without the necessity of an external magnetic field. The altermagnetic spin splitting effect (ASSE) in RuO$_2$ promotes the generation of spin currents with pronounced anisotropic behavior, maximized when the charge current flows along the [010] direction. This unique capability yields the highest field-free switching ratio, maintaining stable SOT switching within an external field range of approximately 400 Oe. Notably, ASSE dominates the spin current, especially when the current is aligned with the [010] direction (θ = 90°). Here, the spin polarization component creates a substantial field-like effective field, surpassing the damping-like field from . This highlights the crucial role of in enhancing spin-torque efficiency and elucidating spin flow modulation mechanics in this crystalline context. Our study highlights the potential of RuO$_2$ as a powerful spin current generator, paving the way for practical applications in spin-torque switching technologies and other cutting-edge spintronic devices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
