Enhanced synchronization in an array of spin torque nano oscillators in the presence of oscillating external magnetic field

TL;DR

This paper shows that applying a common microwave magnetic field to an array of spin torque nano-oscillators significantly improves their synchronization, leading to more stable oscillations and increased microwave power output.

Contribution

It introduces a method to enhance synchronization in spin torque nano-oscillators using an external magnetic field, which was not previously demonstrated.

Findings

Synchronization regions are expanded with the external field.

Enhanced microwave power emission observed.

Locking range of oscillators is increased.

Abstract

We demonstrate that the synchronization of an array of electrically coupled spin torque nano-oscillators (STNO) modelled by Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equation can be enhanced appreciably in the presence of a common external microwave magnetic field. The applied microwave magnetic field stabilizes and enhances the regions of synchronization in the parameter space of our analysis, where the oscillators are exhibiting synchronized oscillations thereby emitting improved microwave power. To characterize the synchronized oscillations we have calculated the locking range in the domain of external source frequency.