Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt

The rapidly evolving utilization of spin Hall effect (SHE) arising from spin-orbit coupling in 5d transition metals and alloys has made giant strides in the development of designing low-power, robust, and nonvolatile magnetic memory. Recent studies, on incorporating nonmetallic lighter elements such as oxygen, nitrogen, and sulfur into 5d transition metals, have shown an enhancement in dampinglike 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 SHE in N-implanted Pt. We observe a crossover of intrinsic to extrinsic side-jump mechanism as the implantation dose increases from 2 x 1016 to 1 x 1017 ions/cm2. A sudden decrease in the intrinsic spin Hall conductivity is counterbalanced by the increase in the extrinsic side-jump induced SHE efficiency. These results conclude that studying theta DL as a function of implantation dose, and as a function of temperature, is important to understand the physical mechanism contributing to SHE.

Automated summary

Recent studies have shown that incorporating nonmetallic lighter elements into 5d transition metals can enhance the efficiency of dampinglike torque. This finding is important for the development of low-power and robust magnetic memory.