论文标题
由界面生成的自旋电流驱动的自旋轨道扭矩
Spin-orbit torques driven by the interface-generated spin currents
论文作者
论文摘要
通过非磁性金属层或在界面上具有破裂的反转对称性的旋转耦合（SOC）产生的自旋电流特别重要。在这里，我们通过具有弱垂直磁各向异性（PMA）的RU/Fe异质结构中的自旋轨道扭矩（SOT）测量探索了自旋当前生成机理。尽管RU的旋转大厅角（SHA）小于PT，TA或W中的旋转角度，但仍可以实现RU/Fe异质结构中的可逆SOT。通过非绝热的谐波霍尔电压测量和宏生模拟，将RU/Fe异质结构中的有效SHA与PT进行了比较。此外，我们还探讨了由界面驱动的自旋电流强烈取决于电导率。我们的结果提出了一种新方法，可在铁磁/非磁性金属双层中有效产生有限的自旋电流，该方法为铁磁系统中的自旋动力学和运输的基本研究提供了新的机会。
The spin currents generated by spin-orbit coupling (SOC) in the nonmagnetic metal layer or at the interface with broken inversion symmetry are of particular interest and importance. Here, we have explored the spin current generation mechanisms through the spin-orbit torques (SOTs) measurements in the Ru/Fe heterostructures with weak perpendicular magnetic anisotropy (PMA). Although the spin Hall angle (SHA) of Ru is smaller than that in Pt, Ta or W, reversible SOT in Ru/Fe heterostructures can still be realized. Through non-adiabatic harmonic Hall voltage measurements and macrospin simulation, the effective SHA in Ru/Fe heterostructures is compared with Pt. Moreover, we also explore that the spin current driven by interface strongly depends on the electrical conductivities. Our results suggest a new method for efficiently generating finite spin currents in ferromagnet/nonmagnetic metal bilayers, which establishes new opportunities for fundamental study of spin dynamics and transport in ferromagnetic systems.
