Microwave oscillations of a nanomagnet driven by a spin-polarized current

2003/06/11 by S. I. Kiselev, J. C. Sankey, Jack C. Sankey +6 · 54 citations
Computer Science · Physics and Astronomy · #Magnetic properties of thin films #Quantum and electron transport phenomena #Quantum-Dot Cellular Automata #cond-mat.mtrl-sci

paper · pdf · doi:10.1038/nature01967

12 pages, 3 figures

arxiv created 2003/06/11 · openalex publication_date 2003/09/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• Current-driven excitation of magnetic multilayers
• Field dependence of magnetization reversal by spin transfer
• Magnetization dynamics with a spin-transfer torque

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