Unveiling the mechanisms of the spin Hall effect in Ta

Spin-to-charge current interconversions are widely exploited for the generation and detection of pure spin currents and are key ingredients for future spintronic devices including spin-orbit torques and spin-orbit logic circuits. In the case of the spin Hall effect, different mechanisms contribute t...

Full description

Saved in:
Bibliographic Details
Published in:Physical review. B 2018-08, Vol.98 (6), p.060410, Article 060410
Main Authors: Sagasta, Edurne, Omori, Yasutomo, Vélez, Saül, Llopis, Roger, Tollan, Christopher, Chuvilin, Andrey, Hueso, Luis E., Gradhand, Martin, Otani, YoshiChika, Casanova, Fèlix
Format: Article
Language:English
Subjects:
Electromagnetism
Hall effect
Logic circuits
Spin valves
Tantalum
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Spin-to-charge current interconversions are widely exploited for the generation and detection of pure spin currents and are key ingredients for future spintronic devices including spin-orbit torques and spin-orbit logic circuits. In the case of the spin Hall effect, different mechanisms contribute to the phenomenon and determining the leading contribution is peremptory for achieving the largest conversion efficiencies. Here, we experimentally demonstrate the dominance of the intrinsic mechanism of the spin Hall effect in highly resistive Ta. We obtain an intrinsic spin Hall conductivity for β-Ta of −820±120(ℏ/e)Ω−1cm−1 from spin absorption experiments in a large set of lateral spin valve devices. The predominance of the intrinsic mechanism in Ta allows us to linearly enhance the spin Hall angle by tuning the resistivity of Ta, reaching up to −35 ± 3%, the largest reported value for a pure metal.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.98.060410