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

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

2003-06-11

arxiv.org/abs/cond-mat/0306259v1

Physics

Condensed Matter

Materials Science

12 pages, 3 figures

Scientific paper

10.1038/nature01967

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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