Nanowire spin torque oscillator driven by spin orbit torques
Nanowire spin torque oscillator driven by spin orbit torques
Duan, Z.; Smith, A.; Yang, L.; Youngblood, B.; Lindner, J.; Demidov, V. E.; Demokritov, S. O.; Krivorotov, I. N.
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 selfoscillations 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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Nature Communications 5(2014), 5616
DOI: 10.1038/ncomms6616
Cited 174 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-21488