期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.167202
关键词
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资金
- US Department of Energy, Office of Basic Energy Sciences
- ALS
- Office of Naval Research
- Army Research Office
- NSF through its NSEC
- NSF
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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