Spin torque from spin current applied to a nanoscale region of a ferromagnetcan act as negative magnetic damping and thereby excite self-oscillations ofits magnetization. In contrast, spin torque uniformly applied to themagnetization of an extended ferromagnetic film does not generateself-oscillatory magnetic dynamics but leads to reduction of the saturationmagnetization. Here we report studies of the effect of spin torque on a systemof intermediate dimensionality - a ferromagnetic nanowire. We observe coherentself-oscillations of magnetization in a ferromagnetic nanowire serving as theactive region of a spin torque oscillator driven by spin orbit torques. Ourwork demonstrates that magnetization self-oscillations can be excited in aone-dimensional magnetic system and that dimensions of the active region ofspin torque oscillators can be extended beyond the nanometer length scale.
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