Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt
Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt
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DOI：
10.1103/physrevb.107.064402
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发表时间：
2022-11
影响因子：
3.7
通讯作者：
Utkarsh Shashank;Yoji Nakamura;Y. Kusaba;Takafumi Tomoda;R. Nongjai;A. Kandasami;R. Medwal;R. Rawat;H. Asada;Surbhi Gupta;Y. Fukuma
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文献类型：
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作者：
Utkarsh Shashank;Yoji Nakamura;Y. Kusaba;Takafumi Tomoda;R. Nongjai;A. Kandasami;R. Medwal;R. Rawat;H. Asada;Surbhi Gupta;Y. Fukuma
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的发展中取得了巨大进步。最近的研究表明，在5d过渡金属中掺入非金属轻元素如氧、氮和硫，由于改性的SHE，阻尼类扭矩效率{\theta}_DL有所增强，但这种增强背后的机制尚不清楚。本文研究了不同温度（100-293 K）下的{\theta}_DL，以解开N注入Pt中本征和非本征侧跳散射引起的自旋霍尔效应。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。这些结果得出结论，研究作为注入剂量的函数的{\theta}_DL，也作为温度的函数，是重要的，以了解物理机制，有助于SHE，这是迄今为止尚未探索的，将非金属元素在5d过渡金属。
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 {\theta}_DL due to the modified SHE, but the mechanism behind this enhancement is not clear. In this paper, we study {\theta}_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 {\theta}_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.