Nanowire spin torque oscillator driven by spin orbit torques

Zheng Duan (), Andrew Smith, Liu Yang, Brian Youngblood, Jürgen Lindner, Vladislav E. Demidov, Sergej O. Demokritov and Ilya N. Krivorotov
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Zheng Duan: University of California
Andrew Smith: University of California
Liu Yang: University of California
Brian Youngblood: University of California
Jürgen Lindner: Helmholtz Zentrum Dresden Rossendorf
Vladislav E. Demidov: University of Münster
Sergej O. Demokritov: University of Münster
Ilya N. Krivorotov: University of California

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6616

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