论文标题
过渡金属垫片对PT/CO Bilayers的自旋轨道扭矩，自旋霍尔磁性和磁各向异性的影响
Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers
论文作者
论文摘要
我们研究了插入0.5 nm厚的间隔层（Ti，v，cr，mo，w），在旋转轨道上的pt/co界面上，霍尔效应，磁场效应，饱和磁化和磁动率。我们发现，与参考pt/co双层相比，所有具有间隔层的样品的阻尼状自旋轨道扭矩均大大降低，这与相对于PT相对于PT的隔离元件的原子自旋型轨道偶联常数的相反符号一致。在等电位3D，4D和5D元件的原子数中，阻尼样扭矩的还原是单调的，除了V比CR更强的V外，v。无论其组成如何，所有隔离层的磁场状自旋轨道扭矩几乎消失了，这表明这种扭矩主要起源于PT/CO界面。异常的霍尔效应，磁势和饱和磁化强度也大大降低，而在间隔层的存在下，板电阻会增加。最后，我们证明了自旋轨道扭矩的振幅，旋转大厅样磁场抗性和垂直磁各向异性之间的相关性。这些结果凸显了超薄垫片层对重金属/铁磁系统的磁转运性能的重要影响。
We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo, W) at the Pt/Co interface on the spin-orbit torques, Hall effect, magnetoresistance, saturation magnetization, and magnetic anisotropy. We find that the damping-like spin-orbit torque decreases substantially for all samples with a spacer layer compared to the reference Pt/Co bilayer, consistently with the opposite sign of the atomic spin-orbit coupling constant of the spacer elements relative to Pt. The reduction of the damping-like torque is monotonic with atomic number for the isoelectronic 3d, 4d, and 5d elements, with the exception of V that has a stronger effect than Cr. The field-like spin-orbit torque almost vanishes for all spacer layers irrespective of their composition, suggesting that this torque predominantly originates at the Pt/Co interface. The anomalous Hall effect, magnetoresistance, and saturation magnetization are also all reduced substantially, whereas the sheet resistance is increased in the presence of the spacer layer. Finally, we evidence a correlation between the amplitude of the spin-orbit torques, the spin Hall-like magnetoresistance, and the perpendicular magnetic anisotropy. These results highlight the significant influence of ultrathin spacer layers on the magnetotransport properties of heavy metal/ferromagnetic systems.
