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Strange non-chaotic attractors in spin valve systems

机译:旋转阀系统中的奇怪的非混沌吸引子

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The current-driven magnetization dynamics in spin torque oscillators is investigated because of its high potential for high-frequency applications. The system consists of a pinned layer with a fixed magnetization and a single-domain free layer, such that it is governed by the Landau-Lifshitz-Gilbert-Slonczewski equation. In particular, we study the effect of a time-dependent quasi-periodic current. We numerically characterize the dynamical behavior of the system by monitoring the Lyapunov exponents, and by calculating the Fourier spectra. We find a rather complicated landscape of sometimes closely intermingled chaotic and non-chaotic areas in the parameters space. Finally, we compute a phase diagram of the existence of the strange non-chaotic attractors.
机译:由于自旋扭矩振荡器在高频应用中具有很高的潜力,因此研究了自旋扭矩振荡器中电流驱动的磁化动力学。该系统由具有固定磁化强度的固定层和一个单畴自由层组成,因此该系统受Landau-Lifshitz-Gilbert-Slonczewski方程支配。特别是,我们研究了时间相关的准周期电流的影响。我们通过监测李雅普诺夫指数并通过计算傅立叶光谱来表征系统的动力学行为。我们发现参数空间中有时紧密混合的混沌和非混沌区域的情况相当复杂。最后,我们计算出一个奇怪的非混沌吸引子的存在的相图。

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