The spin-torque nano-oscillator in the presence of thermal fluctuation is described by the normal form of the Hopf bifurcation with an additive white noise. By the application of the reduction method, the amplitude-phase coupling factor, which has a significant effect on the power spectrum of the spin-torque nano-oscillator, is calculated from the Landau-Lifshitz-Gilbert-Slonczewski equation with the nonlinear Gilbert damping. The amplitude-phase coupling factor exhibits a large variation depending on in-plane anisotropy under the practical external fields.
Cite
@article{arxiv.0811.0425,
title = {Amplitude-Phase Coupling in a Spin-Torque Nano-Oscillator},
author = {Kiwamu Kudo and Tazumi Nagasawa and Rie Sato and Koichi Mizushima},
journal= {arXiv preprint arXiv:0811.0425},
year = {2009}
}
Comments
4 pages, 4 figures, submitted to Journal of Applied Physics via MMM 2008