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Time domain mapping of spin torque oscillator effective energy

  • Author(s): Rowlands, GE
  • Katine, JA
  • Langer, J
  • Zhu, J
  • Krivorotov, IN
  • et al.
Abstract

Stochastic dynamics of spin torque oscillators can be described in terms of magnetization drift and diffusion over a current-dependent effective energy surface given by the Fokker-Planck equation. Here we present a method that directly probes this effective energy surface via time-resolved measurements of the microwave voltage generated by a spin torque oscillator. We show that the effective energy approach provides a simple recipe for predicting spectral linewidths and line shapes near the generation threshold. Our time domain technique also accurately measures the fieldlike component of spin torque in a wide range of the voltage bias values. © 2013 American Physical Society.

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