Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime

Edurne Sagasta, Yasutomo Omori, Miren Isasa, Martin Gradhand, Luis E. Hueso, Yasuhiro Niimi, YoshiChika Otani, Fèlix Casanova
2016 Physical review B  
We systematically measure and analyze the spin diffusion length and the spin Hall effect in Pt with a wide range of conductivities using the spin absorption method in lateral spin valve devices. We observe a linear relation between the spin diffusion length and the conductivity, evidencing that the spin relaxation in Pt is governed by the Elliott-Yafet mechanism. We find a single intrinsic spin Hall conductivity (σ_SH^int=1600±150 Ω^-1cm^-1) for Pt in the full range studied which is in good
more » ... ement with theory. For the first time we have obtained the crossover between the moderately dirty and the superclean scaling regimes of the spin Hall effect by tuning the conductivity. This is equivalent to that obtained for the anomalous Hall effect. Our results explain the spread of the spin Hall angle values in the literature and find a route to maximize this important parameter.
doi:10.1103/physrevb.94.060412 fatcat:kdxbo5ctcfcupgkp4jauaihjri