Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by DC spin-polarized currents

Details Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by DC spin-polarized currents Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by DC spin-polarized currents

2005-05-30

arxiv.org/abs/cond-mat/0505733v2

Phys. Rev. B 72, 224427 (2005)

Physics

Condensed Matter

Other Condensed Matter

12 pages, 4 figures

Scientific paper

10.1103/PhysRevB.72.224427

The spin-transfer torque from a DC spin-polarized current can generate highly-coherent magnetic precession in nanoscale magnetic-multilayer devices. By measuring linewidths of spectra from the resulting resistance oscillations, we argue that the coherence time can be limited at low temperature by thermal deflections about the equilibrium magnetic trajectory, and at high temperature by thermally-activated transitions between dynamical modes. Surprisingly, the coherence time can be longer than predicted by simple macrospin simulations.

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