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, and J. Stöhr
Phys. Rev. Lett. 106, 167202 – Published 21 April 2011
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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.

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  • Received 29 April 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.167202

© 2011 American Physical Society

Authors & Affiliations

X. W. Yu1,*, V. S. Pribiag2,*, Y. Acremann3, A. A. Tulapurkar3, T. Tyliszczak4, K. W. Chou4, B. Bräuer3, Z.-P. Li2, O. J. Lee2, P. G. Gowtham2, D. C. Ralph2, R. A. Buhrman2, and J. Stöhr3

  • 1Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 2Cornell University, Ithaca, New York 14853, USA
  • 3SLAC National Accelerator Laboratory, Menlo Park, California, 94025, USA
  • 4Advanced Light Source, Berkeley, California 94720, USA

  • *Corresponding authors.

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Vol. 106, Iss. 16 — 22 April 2011

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