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(a) HRTEM image shows single crystalline nature of nanowire with a thin oxide outer layer. (b) Magnetization loops of the nanowires measured at and . The hysteresis behavior and remanence were observed at both temperatures.
The SEM image of a Mn-doped GaN NW with two (bright electrodes) and two ferromagnetic Co electrodes (dark electrodes). The numbers in the image represent the Co and electrodes for electrical measurements.
The MR curve as a function of magnetic field between electrodes 2 and 9 at temperatures of , , and , with a bias voltage of . Inset shows MR ratios as a function of temperature for three different sets of electrodes.
The MR curve between the non-magnetic electrodes, 1 and 9 at . Inset shows and curves between electrodes, 2 and 9.
The MR curves for electrodes, 2–9 at with varied bias voltage. Inset: the bias dependences of the MR ratio for three couples of electrodes at .
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