Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current

S. I. Kiselev; J. C. Sankey; I. N. Krivorotov; N. C. Emley; R. J. Schoelkopf; R. A. Buhrman; D. C. Ralph

doi:10.1038/nature01967

Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current

Materials Science 2009-11-10 v1

Authors: S. I. Kiselev , J. C. Sankey , I. N. Krivorotov , N. C. Emley , R. J. Schoelkopf , R. A. Buhrman , D. C. Ralph

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Abstract

We describe direct electrical measurements of microwave-frequency dynamics in individual nanomagnets that are driven by spin transfer from a DC spin-polarized current. We map out the dynamical stability diagram as a function of current and magnetic field, and we show that spin transfer can produce several different types of magnetic excitations, including small-angle precession, a more complicated large-angle motion, and a high-current state that generates little microwave signal. The large-angle mode can produce a significant emission of microwave energy, as large as 40 times the Johnson-noise background.

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@article{arxiv.cond-mat/0306259,
  title  = {Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current},
  author = {S. I. Kiselev and J. C. Sankey and I. N. Krivorotov and N. C. Emley and R. J. Schoelkopf and R. A. Buhrman and D. C. Ralph},
  journal= {arXiv preprint arXiv:cond-mat/0306259},
  year   = {2009}
}

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12 pages, 3 figures

Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current

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