Colossal Spin Hall Effect in Ultrathin Metallic Films
arXiv:1312.6539 · doi:10.1103/PhysRevB.90.180406
Abstract
We predict spin Hall angles up to 80% for ultrathin noble metal films with substitutional Bi impurities. The colossal spin Hall effect is caused by enhancement of the spin Hall conductivity in reduced sample dimension and a strong reduction of the charge conductivity by resonant impurity scattering. These findings can be exploited to create materials with high efficiency of charge to spin current conversion by strain engineering.
4 pages, 5 figures