Litvinenko Artem, Iurchuk Vadym, Sethi Pankaj, Louis Steven, Tyberkevych Vasyl, Li Jia, Jenkins Alex, Ferreira Ricardo, Dieny Bernard, Slavin Andrei, Ebels Ursula
Univ. Grenoble Alpes, CEA, CNRS, Spintec, 38000 Grenoble, France.
Oakland University, 48309 Rochester Michigan United States.
Nano Lett. 2020 Aug 12;20(8):6104-6111. doi: 10.1021/acs.nanolett.0c02195. Epub 2020 Jul 21.
We demonstrate that a spin-torque nano-oscillator (STNO) rapidly sweep-tuned by a bias voltage can be used to perform an ultrafast time-resolved spectral analysis of frequency-manipulated microwave signals. The critical reduction in the time of the spectral analysis comes from the naturally small-time constants of a nanosized STNO (1-100 ns). The demonstration is performed on a vortex-state STNO generating in a frequency range around 300 MHz, when frequency down-conversion and matched filtering is used for signal processing. It is shown that this STNO-based spectrum analyzer can perform analysis of frequency-agile signals, having multiple rapidly changing frequency components with temporal resolution in a μs time scale and frequency resolution limited only by the "bandwidth" theorem. Our calculations show that using uniform magnetization state STNOs it would be possible to increase the operating frequency of a spectrum analyzer to tens of GHz.
我们证明，通过偏置电压快速扫描调谐的自旋扭矩纳米振荡器（STNO）可用于对频率操纵的微波信号进行超快时间分辨光谱分析。光谱分析时间的关键缩短源于纳米级STNO（1 - 100纳秒）自然较小的时间常数。当使用频率下变频和匹配滤波进行信号处理时，该演示是在频率范围约为300 MHz的涡旋态STNO上进行的。结果表明，这种基于STNO的频谱分析仪可以对频率捷变信号进行分析，这些信号具有多个快速变化的频率分量，时间分辨率在微秒时间尺度内，频率分辨率仅受“带宽”定理限制。我们的计算表明，使用均匀磁化状态的STNO有可能将频谱分析仪的工作频率提高到数十吉赫兹。
