Microwave magnetic field modulation of spin torque oscillator based on perpendicular magnetic tunnel junctions

TL;DR

This paper investigates microwave magnetic field modulation of spin-torque oscillators based on perpendicular magnetic tunnel junctions, demonstrating frequency modulation up to 3 GHz and self-synchronization for improved signal quality, with potential for high-data-rate communication.

Contribution

It introduces a magnetic field inductive loop enabling microwave modulation and self-synchronization of STOs based on perpendicular MTJs, enhancing their performance.

Findings

Frequency modulation up to 3 GHz achieved.

Self-synchronization improves linewidth and power.

Potential application in high-data-rate communication.

Abstract

Modulation of a spin-torque oscillator (STO) signal based on a magnetic tunnel junction (MTJ) with perpendicularly magnetized free layer is investigated. Magnetic field inductive loop was created during MTJ fabrication process, which enables microwave field application during STO operation. The frequency modulation by the microwave magnetic field of up to 3 GHz is explored, showing a potential for application in high-data-rate communication technologies. Moreover, an inductive loop is used for self-synchronization of the STO signal, which after field-locking exhibits significant improvement of the linewidth and oscillation power.