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TMR curves of the MTJ with the ultrathin FeCo (0.5 nm) electrode. Magnetic fields were applied at 0° (in-plane) and 70° to the film plane.
Schematic illustration of the spin-transfer induced FMR measurement set-up. SG, SM, and AM stand for signal generator, source meter, and amplitude modulation, respectively.
Spin-transfer induced FMR signals measured under various (a) positive and (b) negative bias voltages.
Peak frequency of the spin-transfer induced FMR signal as a function of the applied electric fields. The right vertical axis represents the surface anisotropy energy, as estimated from the peak frequency.
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