Litvinenko Artem, Sidi El Valli Ahmed, Iurchuk Vadym, Louis Steven, Tyberkevych Vasyl, Dieny Bernard, Slavin Andrei N, Ebels Ursula
Université Grenoble Alpes, CEA, CNRS, Spintec, 38000 Grenoble, France.
Oakland University, Rochester, Michigan 48309, United States.
Nano Lett. 2022 Mar 9;22(5):1874-1879. doi: 10.1021/acs.nanolett.1c04031. Epub 2022 Feb 15.
The advantage of an ultrafast frequency-tunability of spin-torque nano-oscillators (STNOs) that have a large (>100 MHz) relaxation frequency of amplitude fluctuations is exploited to realize ultrafast wide-band time-resolved spectral analysis at nanosecond time scale with a frequency resolution limited only by the "bandwidth" theorem. The demonstration is performed with an STNO generating in the 9 GHz frequency range and comprised of a perpendicular polarizer and a perpendicularly and uniformly magnetized "free" layer. It is shown that such a uniform-state STNO-based spectrum analyzer can efficiently perform spectral analysis of frequency-agile signals with rapidly varying frequency components.
利用自旋扭矩纳米振荡器（STNO）的超快频率可调性优势，其幅度波动的弛豫频率较大（>100 MHz），以在纳秒时间尺度上实现超快宽带时间分辨光谱分析，频率分辨率仅受“带宽”定理限制。该演示是通过一个在9 GHz频率范围内产生信号的STNO进行的，它由一个垂直偏振器和一个垂直且均匀磁化的“自由”层组成。结果表明，这种基于均匀态STNO的频谱分析仪能够有效地对具有快速变化频率分量的频率捷变信号进行频谱分析。
