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 languageEnglish (US)
Article number167202
JournalPhysical review letters
Volume106
Issue number16
DOIs
StatePublished - Apr 21 2011
Externally publishedYes

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    Yu, X. W., Pribiag, V. S., Acremann, Y., Tulapurkar, A. A., Tyliszczak, T., Chou, K. W., Bräuer, B., Li, Z. P., Lee, O. J., Gowtham, P. G., Ralph, D. C., Buhrman, R. A., & Stöhr, J. (2011). Images of a spin-torque-driven magnetic nano-oscillator. Physical review letters, 106(16), [167202]. https://doi.org/10.1103/PhysRevLett.106.167202