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

Edurne Sagasta, Yasumoto Omori, Miren Isasa, Martin Gradhand, Luis E. Hueso, Yasuhiro Niimi, Yoshichika Otani, Fèlix Casanova

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Abstract

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 (σintSH=1600±150Ω−1cm−1) for Pt in the full range studied which is in good agreement with theory. 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.
Original languageEnglish
Article number060412(R)
Number of pages6
JournalPhysical Review B
Volume94
DOIs
Publication statusPublished - 30 Aug 2016

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