Modulation Rate Study in a Spin-Torque Oscillator-Based Wireless Communication System

We study a wireless communication system based on a magnetic tunnel junction spin-torque nano-oscillator (STNO) by employing amplitude-shift-keying modulation. By varying the pulse modulation frequency (f_m) from 1 kHz to 2 MHz and distance (D) between the antenna from 25 to 150 cm, we show a maximum data rate of 6 Mb/s (at D = 25 cm and f_m = 1 MHz), a limit imposed by our setup and noise generated by the STNO itself. We also report the average amplitude noise (S_δa) and average white frequency noise (S_wh) of the wireless communication system and discuss their dependence on the distance between the antennas.