Frequency shift keying by current modulation in a MTJ-based STNO with high data rate

TL;DR

This paper demonstrates that MTJ-based spin torque nano-oscillators can perform frequency-shift keying at data rates up to 400 Mbps, showing promise for wireless communication applications due to their agility and CMOS compatibility.

Contribution

It introduces a method for using MTJ-based STNOs for high-speed FSK modulation, achieving data rates suitable for wireless networks.

Findings

FSK up to 400 Mbps demonstrated

Agile frequency variation below intrinsic relaxation frequency

Suitable for wireless communication applications

Abstract

Spin torque nano-oscillators are nanoscopic microwave frequency generators which excel due to their large frequency tuning range and agility for amplitude and frequency modulation. Due to their compactness, they are regarded as suitable candidates for applications in wireless communications, where cost-effective and CMOS-compatible standalone devices are required. In this work, we study the ability of a magnetic-tunnel-junction (MTJ) based spin torque nano-oscillator to respond to a binary input sequence encoded in a square-shaped current pulse for its application as a frequency-shift-keying (FSK) based emitter. We demonstrate that below the limit imposed by the spin torque nano-oscillators intrinsic relaxation frequency, an agile variation between discrete oscillator states is possible. For this kind of devices, we demonstrate FSK up to data rates of 400 Mbps which is well suited for the application of such scillators in wireless networks.