Spin-torque oscillator linewidth narrowing under current modulation
arXiv:1104.3167 · doi:10.1063/1.3588038
Abstract
We study the behavior of the linewidth of a nano-contact based spin torque oscillator (STO) under application of a radio frequency (100 MHz) modulating current. We achieve a significant (up to 85%) reduction of the STO linewidth when it is modulated across a region of high nonlinearity. The mechanism responsible for the linewidth reduction is the nonlinear frequency shift under the influence of current modulation, which reduces the nonlinear amplification of the linewidth. The reduction of the linewidth during modulation can be quantitatively calculated from the free-running behavior of the STO.
3 pages, 4 figures, Accepted for publication in Applied Physics Letters
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- Time-domain stability of parametric synchronization in a spin-torque nano-oscillator based on a magnetic tunnel junction
- Modulation and phase-locking in nanocontact vortex oscillators
- A quasi-linear spin-torque nano-oscillator via enhanced negative feedback of power fluctuations
- Mutual synchronization in spin torque and spin Hall nano-oscillators