Zeng Lang, Liu Yang, Chen Hao-Hsuan, Zhou Yan, Zhang Deming, Zhang Youguang, Zhao Weisheng
Fert Beijing Institute, BDBC, and School of Microelectronics, Beihang University, Beijing 100191, People's Republic of China. Hefei Innovation Research Institute, Beihang University, Hefei 230013, People's Republic of China.
Nanotechnology. 2020 Sep 11;31(37):375205. doi: 10.1088/1361-6528/ab925a. Epub 2020 May 12.
The spin torque nano-oscillator (STNO) is a very promising candidate for next generation telecommunication systems due to its small size ~100 nm and high output frequency range. However, it still suffers low output power, usually smaller than µW, and very high phase noise. Also, the modulation method for the STNO should be further developed. The frequency modulation and amplitude modulation method for STNO can be easily applied because of the non-linear nature of STNO, yet it is very rare to see the proposal of a phase modulation method. In this work, we propose a robust phase shift keying modulation method for STNO. Its feasibility is demonstrated with both theoretical and numerical analysis, and its robustness is investigated under room temperature thermal noise. It is shown that our proposed phase modulation method can tune the phase arbitrarily, while the modulation speed can be as fast as 10 ns at room temperature. Comparing with the other phase modulation method, our approach has advantages of larger phase tuning range and stronger robustness against thermal noise.
自旋扭矩纳米振荡器（STNO）由于其约100纳米的小尺寸和高输出频率范围，是下一代电信系统非常有前途的候选者。然而，它仍然存在输出功率低（通常小于微瓦）和相位噪声非常高的问题。此外，STNO的调制方法仍需进一步开发。由于STNO的非线性特性，STNO的频率调制和幅度调制方法很容易应用，但很少看到相位调制方法的提议。在这项工作中，我们提出了一种用于STNO的稳健的相移键控调制方法。通过理论和数值分析证明了其可行性，并在室温热噪声下研究了其稳健性。结果表明，我们提出的相位调制方法可以任意调整相位，同时在室温下调制速度可以快至10纳秒。与其他相位调制方法相比，我们的方法具有更大的相位调谐范围和更强的抗热噪声稳健性。
