Determination of spin diffusion length in Bi [formula omitted]-doped Cu films by weak antilocalization measurements

Abstract

Working with the weak antilocalization measurements, we investigate the spin diffusion length in Bi δ-doped Cu films with the fine-tuned Bi concentration. By exploiting the long spin diffusion length of Cu and the strong spin-orbit coupling of Bi with the δ-doping technique, the spin diffusion length can be tuned artificially. Furthermore, it is found that the spin relaxation is dominated by elastic scatterings from Bi impurities in Bi δ-doped Cu systems, which follows the Elliott-Yafet mechanism.