High-Efficiency Long-Spin-Coherence Electrical Spin Injection in CoFe/lnGaAs Two-Dimensional Electron Gas Lateral Spin-Valve Devices

摘要

Electrical spin injection experiments are performed at 1.5 K in a new hybrid structure, lno.75Gao.25As two-dimensional electron gases with lateral Co_(0.8)Fe_(0.2) electrodes. From the electrode spacing (≤9μm) dependence of the spin-valve signals in the nonlocal regime, we obtained very promising results such as longer spin diffusion length L_s 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.