Electrical spin injection into n-GaAs channels and detection through MgO/CoFeB electrodes

Spin injection and detection between MgO tunnel barrier/CoFeB electrodes and n-GaAs channels were investigated by means of all electrical transport measurements. The magnetoresistance of the GaAs/MgO/CoFeB junctions and non-local signals through the lateral GaAs channel were detected in the same sample. The non-local signals were detected when the magnetization directions of two CoFeB electrodes differed. This correspondence between the magnetization directions and the non-local signals clearly shows that the injection and detection of the spin-polarized current are realized in the GaAs/MgO/CoFeB systems.