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

• DOI: 10.1143/apex.5.113001
• Publication Date: 2012-10-12T03:44:33Z
• Authors: Shiro Hidaka; Masashi Akabori; Syoji Yamada
• Keywords: Spin valve; Spin diffusion

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 spin-valve signals nonlocal regime, we obtained very promising results such as longer diffusion length Ls ∼5.1 µm and higher polarization η ∼5.7% than those former reports. They mainly attained by suppression D'yakonov–Perel' relaxation process due to tuned spin–orbit couplings.