Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback
Self-Injection Locking of a Vortex Spin Torque Oscillator by Delayed Feedback
复制标题
延迟反馈涡旋自旋扭矩振荡器的自注入锁定
作者：
S. Tsunegi;E. Grimaldi;R. Lebrun;H. Kubota;A. Jenkins;K. Yakushiji;A. Fukushima;P. Bortolotti;J. Grollier;S. Yuasa;V. Cros
通过在一定延迟时间后重新注入自旋扭矩振荡器的射频电流，实验研究了自旋扭矩振荡器的自同步。我们证明，对于最佳延迟，积分功率和谱线宽都得到了改善。此外，通过改变发射功率和重新注入功率之间的相位差，我们发现振荡器的频率、功率和线宽对相位差有明显的振荡依赖关系，周期为2π。非线性自振子的一般模型很好地描述了自注入区域内的这种周期性行为，该模型不仅包括延迟的射频电流，而且还包括导致自同步的所有自旋扭矩。我们的结果揭示了控制自旋扭矩振荡器非自治动力学的新方法，这是射频自旋电子学应用以及开发基于神经启发的自旋扭矩振荡器的关键问题。
The self-synchronization of spin torque oscillators is investigated experimentally by re-injecting its radiofrequency (rf) current after a certain delay time. We demonstrate that the integrated power and spectral linewidth are improved for optimal delays. Moreover by varying the phase difference between the emitted power and the re-injected one, we find a clear oscillatory dependence on the phase difference with a 2π periodicity of the frequency of the oscillator as well as its power and linewidth. Such periodical behavior within the self-injection regime is well described by the general model of nonlinear auto-oscillators including not only a delayed rf current but also all spin torque forces responsible for the self-synchronization. Our results reveal new approaches for controlling the non-autonomous dynamics of spin torque oscillators, a key issue for rf spintronics applications as well as for the development of neuro-inspired spin-torque oscillators based devices.
影响因子：
16.6
作者：
Chumak, Andrii V.;Serga, Alexander A.;Hillebrands, Burkard
通讯作者：
Hillebrands, Burkard