论文标题
旋转轨道扭矩控制的随机振荡器，具有同步和频率可调性
Spin orbit torque controlled stochastic oscillators with synchronization and frequency tunability
论文作者
论文摘要
基于新兴纳米版的随机振荡器由于其超低功率要求和表现随机共振的能力而具有吸引力，这是一种现象，在这种现象中，由于环境噪声，启用了同步与弱输入信号。在这项工作中，展示了基于纳米磁体的低障碍随机振荡器，其输出通过利用环境热噪声在两个状态之间自发跳跃，不需要额外的功率。在三个末端设备配置中利用自旋轨道扭矩，这些振荡器的相位同步在特定频率的弱周期性驱动器上进行了同步。进行实验以通过控制电反馈参数来显示此同步频率的可调性。同步所需的电流比确定性切换相似的纳米磁设备所需的电流高8倍以上。采用了基于Kramers的过渡速率的模型，采用了对称双井潜力，并进行了动态模拟以解释实验结果。
Stochastic oscillators based on emerging nanodevices are attractive because of their ultra-low power requirement and ability to exhibit stochastic resonance, a phenomenon where synchronization to weak input signals is enabled due to ambient noise. In this work, a low barrier nanomagnet based stochastic oscillator is demonstrated, whose output jumps spontaneously between two states by harnessing the ambient thermal noise, requiring no additional power. Utilizing spin orbit torque in a three terminal device configuration, phase synchronization of these oscillators to weak periodic drives of particular frequencies is demonstrated. Experiments are performed to show the tunability of this synchronization frequency by controlling an electrical feedback parameter. The current required for synchronization is more than 8 times smaller than that required for deterministic switching of similar nanomagnetic devices. A model based on Kramers' transition rate in a symmetric double well potential is adopted and dynamical simulations are performed to explain the experimental results.
