Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
Synchronized, periodic, and chaotic dynamics in spin torque oscillator with two free layers
复制标题
具有两个自由层的自旋扭矩振荡器的同步、周期和混沌动力学
DOI：
10.1016/j.jmmm.2019.03.090
复制
发表时间：
2019
影响因子：
2.7
通讯作者：
T. Taniguchi
中科院分区：
文献类型：
--
作者：
T. Taniguchi
通过数值求解自旋扭矩振子中的Landau-Lifshitz-Gilbert(LLG)方程，研究了自旋扭矩振子的磁化动力学相图。在较宽的电流密度范围内，我们计算了低场和高场情况下的动力学，发现了许多动力学阶段，如同步、不同频率的自激振荡和混沌动力学。同步的观察表明，存在一个用传统的电检测方法在实验上没有发现的动力学相。不同频率的自激振荡导致了磁阻的高频振荡，这是可以通过实验测量的。另一方面，大电流区磁阻的混沌和/或周期行为导致傅立叶谱中峰值频率的不连续变化。
A phase diagram of the magnetization dynamics is studied by numerically solving the Landau-Lifshitz-Gilbert (LLG) equation in a spin torque oscillator consisting of asymmetric two free layers that are magnetized in in-plane direction. We calculated the dynamics for a wide range of current density for both low and high field cases, and found many dynamical phases such as synchronization, auto-oscillation with different frequencies, and chaotic dynamics. The observation of the synchronization indicates the presence of a dynamical phase which has not been found experimentally by using the conventional electrical detection method. The auto-oscillations with different frequencies lead to an oscillation of magnetoresistance with a high frequency, which can be measured experimentally. The chaotic and/or periodic behavior of magnetoresistance in a high current region, on the other hand, leads to a discontinuous change of the peak frequency in Fourier spectrum.
影响因子：
4
作者：
S. Urazhdin;V. Demidov;R. Cao;B. Divinskiy;V. Tyberkevych;A. Slavin;A. Rinkevich;S. Demokritov
通讯作者：
S. Urazhdin;V. Demidov;R. Cao;B. Divinskiy;V. Tyberkevych;A. Slavin;A. Rinkevich;S. Demokritov
影响因子：
3.7
作者：
Chen, Yan-Ting;Takahashi, Saburo;Bauer, Gerrit E. W.
通讯作者：
Bauer, Gerrit E. W.