Electrical spin injection experiments are performed at 1.5 K in a new hybrid structure, In0.75Ga0.25As two-dimensional electron gases with lateral Co0.8Fe0.2 electrodes. From the electrode spacing (\lesssim9 µm) dependence of the spin-valve signals in the nonlocal regime, we obtained very promising results such as longer spin diffusion length Ls of ∼5.1 µm and higher spin polarization η of ∼5.7% than those in former reports. They are mainly attained by the suppression of the D'yakonov–Perel' spin relaxation process due to the tuned spin–orbit couplings.
S. Hidaka, M. Akabori, S. Yamada
Applied Physics Express