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Giant Inverse Spin Hall Effect in Bi Doped PtBi Alloy
Author(s) -
Hong Caiyun,
Jin Lichuan,
Zhang Huaiwu,
Li Mingming,
Rao Yiheng,
Ma Bo,
Li Jialu,
Zhong Zhiyong,
Yang Qinghui
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201700632
Subject(s) - spin hall effect , spintronics , spin pumping , condensed matter physics , materials science , spin diffusion , ferromagnetism , ferromagnetic resonance , spin (aerodynamics) , hall effect , alloy , scattering , spin polarization , electrical resistivity and conductivity , physics , magnetization , magnetic field , optics , metallurgy , quantum mechanics , thermodynamics , electron
For generating or detecting spin currents without ferromagnetic materials in spintronic devices, nonmagnetic materials with large spin Hall angles would elicit extreme interest. A giant inverse spin Hall effect (ISHE) generating in Pt doped with 8% Bi by composition is demonstrated. From a combination of ferromagnetic resonance, spin pumping, and ISHE experiments, a large spin current is found induced in an yttrium iron garnet/Pt 0.92 Bi 0.08 bilayer. The spin diffusion length and spin Hall angle of the Pt 0.92 Bi 0.08 alloy are λ SD = 3.3 ± 0.1 nm and θ SH = 0.106 ± 0.005, respectively. In the experiments, the spin–charge conversion of this alloy is twice that of Pt and is larger than most reported heavy metals. Such enhancement can be attributed to the skew scattering from the high atomic number of Bi impurities via the spin–orbit interaction.