Images of a spin-torque-driven magnetic nano-oscillator

X. W. Yu; V. S. Pribiag; Y. Acremann; A. A. Tulapurkar; T. Tyliszczak; K. W. Chou; B. Bräuer; Z. P. Li; O. J. Lee; P. G. Gowtham; D. C. Ralph; R. A. Buhrman; J. Stöhr

doi:10.1103/PhysRevLett.106.167202

Images of a spin-torque-driven magnetic nano-oscillator

X. W. Yu, V. S. Pribiag, Y. Acremann, A. A. Tulapurkar, T. Tyliszczak, K. W. Chou, B. Bräuer, Z. P. Li, O. J. Lee, P. G. Gowtham, D. C. Ralph, R. A. Buhrman, J. Stöhr

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Abstract

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 ∼10nm, in agreement with micromagnetic simulations.

Original language	English (US)
Article number	167202
Journal	Physical review letters
Volume	106
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.106.167202
State	Published - Apr 21 2011
Externally published	Yes

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title = "Images of a spin-torque-driven magnetic nano-oscillator",

abstract = "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 ∼10nm, in agreement with micromagnetic simulations.",

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AU - Yu, X. W.

AU - Pribiag, V. S.

AU - Acremann, Y.

AU - Tulapurkar, A. A.

AU - Tyliszczak, T.

AU - Chou, K. W.

AU - Bräuer, B.

AU - Li, Z. P.

AU - Lee, O. J.

AU - Gowtham, P. G.

AU - Ralph, D. C.

AU - Buhrman, R. A.

AU - Stöhr, J.

PY - 2011/4/21

Y1 - 2011/4/21

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AB - 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 ∼10nm, in agreement with micromagnetic simulations.

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Images of a spin-torque-driven magnetic nano-oscillator

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