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

TL;DR

This study investigates how nitrogen implantation in platinum influences the spin Hall effect by disentangling intrinsic and extrinsic scattering mechanisms, revealing a crossover that impacts SHE efficiency and conductivity.

Contribution

It provides new insights into the mechanisms of SHE enhancement in N-implanted Pt by analyzing temperature and dose-dependent effects on intrinsic and extrinsic scattering.

Findings

Crossover from intrinsic to extrinsic side-jump mechanism with increased implantation dose.

Decrease in intrinsic spin Hall conductivity balanced by increased SHE efficiency.

Temperature and dose dependence are crucial for understanding SHE mechanisms in modified platinum.

Abstract

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.