Spin Hall effect from hybridized 3d-4p orbitals

Yong Chang Lau, Hwachol Lee, Guanxiong Qu, Kohji Nakamura, Masamitsu Hayashi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We show that a paramagnetic CoGa compound possesses large enough spin Hall angle to allow robust spin-orbit torque switching of perpendicularly magnetized ferrimagnetic MnGa films in CoGa/MnGa/oxide heterostructures. The spin Hall efficiency estimated via spin Hall magnetoresistance and harmonic Hall measurements is +0.05±0.01, which is surprisingly large for a system that does not contain any heavy metal element. First-principles calculations corroborate our experimental observations and suggest that the hybridized Co 3d-Ga 4p orbitals are responsible for the intrinsic spin Hall effect. Our results suggest that efficient spin current generation can be realized in intermetallics by alloying a transition metal with a p-orbital element and by Fermi-level tuning.

Original languageEnglish
Article number064410
JournalPhysical Review B
Volume99
Issue number6
DOIs
Publication statusPublished - 2019 Feb 12
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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