2017/06/19 by Yong‐Chang Lau, Yong-Chang Lau, Hwachol Lee +3
Materials Science · Physics and Astronomy · #Brillouin zone #Condensed matter physics #Coupling (piping) #Electrical resistivity and conductivity #Electron #Ferrimagnetism #Hall effect #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic properties of thin films #Magnetization #Materials science #Metallurgy #Multiferroics and related materials #Physics #Quantum mechanics #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Thermodynamics #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.99.064410
published as Phys. Rev. B 99, 064410 (2019) · 17 pages, 4 figures, Supplementary information provided
arxiv created 2017/06/19 · openalex created_date 2017/06/30 · openalex publication_date 2019/02/12 · arxiv updated 2019/02/20 · openalex updated_date 2026/08/06
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\ifmmode±\else\textpm\fi0.01, 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.