Images of a Spin-Torque-Driven Magnetic Nano-Oscillator
- Images of a Spin-Torque-Driven Magnetic Nano-Oscillator
- 이억재; XW Yu; VS Pribiag; Y Acremann; AA Tulapurkar; T Tyliszczak; KW Chou; B Brauer; Z-P Li; PG Gowtham; DC Ralph; RA Buhrman; J Stohr
- Issue Date
- Physical review letters
- VOL 106, NO 16, 167202
- We present the first space- and time-resolved images of the spin-torque-induced steady-state oscillation of a magnetic vortex in a spin-valve nanostructure. We find that the vortex structure in a nanopillar is considerably more complicated than the 2D idealized structure often-assumed, which has important implications for the driving efficiency. The sense of the vortex gyration is uniquely determined by the vortex core polarity, confirming that the spin-torque acts as a source of negative damping even in such a strongly nonuniform magnetic system. The orbit radius is similar to 10 nm, in agreement with micromagnetic simulations.
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