N注入Pt中自旋霍尔效应引起的本征和非本征侧跳散射的退纠缠
Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt
摘要：
自旋霍尔效应（SHE）的快速发展利用产生于5d过渡金属和合金中的自旋-轨道耦合，在设计低功率、鲁棒和非易失性磁存储器方面取得了巨大的进步。最近的研究表明，在5d过渡金属中引入非金属轻元素如氧、氮和硫，由于改性的SHE，类阻尼扭矩效率θ_DL得到了提高，但这种提高背后的机制尚不清楚。本文研究了不同温度（100-293 K）下注入N的Pt中自旋霍尔效应引起的本征和非本征侧跳散射的θ_DL。当注入剂量从2*10^16 ions/cm 2增加到1*10^17 ions/cm 2时，我们观察到本征到非本征侧跳机制的交叉。固有自旋霍尔电导率的突然降低被侧跳引起的SHE效率的增加所抵消。这些结果表明，研究θ DL随注入剂量和温度的变化关系，对于理解SHE的物理机制是很重要的，而这一机制在5d过渡金属中引入非金属元素时还没有得到充分的研究。
英文摘要：
The rapidly evolving utilization of spin Hall effect (SHE) arising from spin-orbit coupling in 5d transition metals and alloys have made giant strides in the development of designing low-power, robust and non-volatile magnetic memory. Recent studies, on incorporating non-metallic lighter elements such as oxygen, nitrogen and sulfur into 5d transition metals, have shown an enhancement in damping-like torque efficiency θ_DL due to the modified SHE, but the mechanism behind this enhancement is not clear. In this paper, we study θ_DL at different temperatures (100-293 K) to disentangle the intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt. We observe a crossover of intrinsic to extrinsic side-jump mechanism as the implantation dose increases from 2*10^16 ions/cm2 to 1*10^17 ions/cm2. A sudden decrease in the intrinsic spin Hall conductivity is counterbalanced by the increase in the side-jump induced SHE efficiency. These results conclude that studying θ_DL as a function of implantation dose, and also as a function of temperature, is important to understand the physical mechanism contributing to SHE, which has so far been unexplored in incorporating non-metallic element in 5d transition metals.
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