Spin-transfer-driven ferromagnetic resonance of individual nanomagnets

J. C. Sankey; P. M. Braganca; A. G. F. Garcia; I. N. Krivorotov; R. A. Buhrman; D. C. Ralph

doi:10.1103/PhysRevLett.96.227601

Spin-transfer-driven ferromagnetic resonance of individual nanomagnets

Materials Science 2009-11-11 v1 Other Condensed Matter

Authors: J. C. Sankey , P. M. Braganca , A. G. F. Garcia , I. N. Krivorotov , R. A. Buhrman , D. C. Ralph

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Abstract

We demonstrate a technique that enables ferromagnetic resonance (FMR) measurements of the normal modes for magnetic excitations in individual nanoscale ferromagnets, smaller in volume by a factor of 1000 than can be probed by other methods. The measured peak shapes indicate two regimes of response: simple FMR and phase locking. Studies of the resonance frequencies, amplitudes, and linewidths as a function of microwave power, DC current, and magnetic field provide detailed new information about the exchange, damping, and spin-transfer torques that govern the dynamics in magnetic nanostructures.

Keywords

ferromagnetic resonance spin-transfer torque nanomagnet phase locking magnetic dynamics damping

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@article{arxiv.cond-mat/0602105,
  title  = {Spin-transfer-driven ferromagnetic resonance of individual nanomagnets},
  author = {J. C. Sankey and P. M. Braganca and A. G. F. Garcia and I. N. Krivorotov and R. A. Buhrman and D. C. Ralph},
  journal= {arXiv preprint arXiv:cond-mat/0602105},
  year   = {2009}
}

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19 pages, 4 figures

Spin-transfer-driven ferromagnetic resonance of individual nanomagnets

Abstract

Keywords

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