A theoretical study of delayed feedback in a spin-torque nano-oscillator model is presented. The feedback acts as a modulation of the supercriticality, which results in changes in the oscillator frequency through a strong non-linearity, amplitude modulations, and a rich modulation sideband structure in the power spectrum at long delays. Modulation sidebands persist at finite temperatures but some of the complex structure is lost through the finite coherence time of the oscillations.

中文翻译：

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延迟反馈对自旋扭矩纳米振荡器功率谱的影响

提出了自旋转矩纳米振荡器模型中的延迟反馈的理论研究。反馈充当超临界的调制，通过长时间的强功率频谱中的强非线性，幅度调制和丰富的调制边带结构，导致振荡器频率发生变化。调制边带会在有限的温度下持续存在，但是一些复杂的结构会由于有限的振荡相干时间而丢失。