Spin transport in an InAs based two-dimensional electron gas nanochannel

A spin device composed of two ferromagnetic electrodes and InAs two-dimensional electron gas was fabricated. Submicron spin channels were defined to enhance spin transport characteristics. Electrical transport measurement was performed to detect spin-polarized electrons. In potentiometric geometry a voltage change, ΔV=0.17 mV, sensed by a ferromagnetic electrode was obtained at 5 and 77 K. In the nonlocal method ΔV=0.057 mV, which resulted from accumulated spin-polarized electrons, was obtained at 77 K. The main reason for theses large signals is that the short and narrow spin channels increase the possibility for spin-polarized electrons to arrive at the spin detector.