Abstract
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=0.17mV, sensed by a ferromagnetic electrode was obtained at 5 and 77K. In the nonlocal method ΔV=0.057mV, which resulted from accumulated spin-polarized electrons, was obtained at 77K. 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.
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