Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

K. V. Thadani; G. Finocchio; Z. -P. Li; O. Ozatay; J. C. Sankey; I. N. Krivorotov; Y. -T. Cui; R. A. Buhrman; D. C. Ralph

doi:10.1103/PhysRevB.78.024409

Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

Other Condensed Matter 2009-11-13 v1 Materials Science

Authors: K. V. Thadani , G. Finocchio , Z. -P. Li , O. Ozatay , J. C. Sankey , I. N. Krivorotov , Y. -T. Cui , R. A. Buhrman , D. C. Ralph

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Abstract

We measure the microwave signals produced by spin-torque-driven magnetization dynamics in patterned magnetic multilayer devices at room temperature, as a function of the angle of a magnetic field applied in the sample plane. We find strong variations in the frequency linewidth of the signals, with a decrease by more than a factor of 20 as the field is rotated from the magnetic easy axis to the in-plane hard axis. Based on micromagnetic simulations, we identify these variations as due to a transition from spatially incoherent to coherent precession.

Keywords

spin-torque nano-oscillators linewidth variation in-plane magnetic field magnetization dynamics micromagnetic simulations coherent precession

Cite

@article{arxiv.0803.2871,
  title  = {Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle},
  author = {K. V. Thadani and G. Finocchio and Z. -P. Li and O. Ozatay and J. C. Sankey and I. N. Krivorotov and Y. -T. Cui and R. A. Buhrman and D. C. Ralph},
  journal= {arXiv preprint arXiv:0803.2871},
  year   = {2009}
}

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15 pages, 5 figures

Strong linewidth variation for spin-torque nano-oscillators as a function of in-plane magnetic field angle

Abstract

Keywords

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