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Nat Commun. 2014 Dec 5;5:5616. doi: 10.1038/ncomms6616.

Nanowire spin torque oscillator driven by spin orbit torques.

Author information

1
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
2
Helmholtz Zentrum Dresden Rossendorf, D-01328 Dresden, Germany.
3
Department of Physics and Center for Nonlinear Science, University of Münster, Corrensstrasse 2-4, 48149 Münster, Germany.
4
1] Department of Physics and Center for Nonlinear Science, University of Münster, Corrensstrasse 2-4, 48149 Münster, Germany [2] Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russia.

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.

PMID:
25476073
DOI:
10.1038/ncomms6616

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