Synchronization of an array of spin torque nano oscillators in periodic applied external magnetic field

TL;DR

This paper demonstrates that a common external magnetic field can synchronize an array of spin torque nano oscillators (STNOs) without direct coupling, potentially enhancing microwave power output.

Contribution

It reveals that an external magnetic field alone can induce synchronization in STNO arrays, a novel finding that bypasses the need for spin current coupling.

Findings

External magnetic field induces synchronization in STNOs

Synchronization occurs in both in-phase and anti-phase modes

Potential for microwave power enhancement

Abstract

Considering an array of spin torque transfer nano oscillators (STNOs), we have investigated the synchronization property of the system under the action of a common periodically driven applied external magnetic field by numerically analyzing the underlying system of Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equations for the macro-spin variables. We find the novel result that the applied external magnetic field can act as a medium to induce synchronization of periodic oscillations, both in-phase and anti-phase, even without coupling through spin current, thereby leading to the exciting possibility of enhancement of microwave power in a straightforward way.