Charge-spin interconversion in nitrogen sputtered Pt via extrinsic spin Hall effect.

We experimentally investigate the charge-spin interconversion by introducing a lighter impurity, namely nitrogen (N) into Pt by varying the nitrogen gas flow rate, Q from 0 to 20 %, and studying the Onsager reciprocity of spin Hall effect (SHE) via complimentary methods of spin-torque ferromagnetic resonance (ST-FMR) and spin-pumping inverse spin Hall effect (SP-ISHE) measurements, respectively. We notice a reduction in the crystalline nature of Pt upon nitrogen incorporation. We observe the influence of extrinsic side-jump scattering induced SHE by measuring the spin Hall efficiency, θ_SH in a wide temperature range from 10-296 K. This work establishes the incorporation of N in Pt by using sputtering, to enhance the SHE via extrinsic scattering as well as to observe the reciprocal effects of charge-spin interconversion.