Robust phase shift keying modulation method for spin torque nano-oscillator.

Spin Torque Nano-Oscillator (STNO) is a very promising candidate for the next generation telecommunication system since 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. Besides, the modulation method for STNO should be further developed. The frequency modulation and amplitude modulation method for STNO can be easily applied since the non- linear nature of STNO yet it is very rare for 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 numerical and analytical 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 under room temperature. Comparing with the other phase modulation method, our approach has advantages of larger phase tuning range and stronger robustness against thermal noise.