Graham E. Rowlands, Jordan A. Katine, Juergen Langer, Jian Zhu, Ilya N. Krivorotov
Stochastic dynamics of spin torque oscillators (STOs) 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 STO. We show that the effective energy approach provides a simple recipe for predicting spectral line widths and line shapes near the generation threshold. Our time domain technique also accurately measures the field-like component of spin torque in a wide range of the voltage bias values.
View original:
http://arxiv.org/abs/1302.4480
No comments:
Post a Comment