Nanowire spin torque oscillator driven by spin orbit torques

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Abstract

Spin torque from spin current applied to a nanoscale region of a ferromagnet can act as negative magnetic damping and thereby excite self-oscillations of its magnetization. In contrast, spin torque uniformly applied to the magnetization of an extended ferromagnetic film does not generate self-oscillatory magnetic dynamics but leads to reduction of the saturation magnetization. Here we report studies of the effect of spin torque on a system of intermediate dimensionality - a ferromagnetic nanowire. We observe coherent self-oscillations of magnetization in a ferromagnetic nanowire serving as the active region of a spin torque oscillator driven by spin orbit torques. Our work demonstrates that magnetization self-oscillations can be excited in a one-dimensional magnetic system and that dimensions of the active region of spin torque oscillators can be extended beyond the nanometre length scale.

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Duan, Z., Smith, A., Yang, L., Youngblood, B., Lindner, J., Demidov, V. E., … Krivorotov, I. N. (2014). Nanowire spin torque oscillator driven by spin orbit torques. Nature Communications, 5. https://doi.org/10.1038/ncomms6616

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