Nonlinear behavior and mode coupling in spin transfer nano-oscillators

TL;DR

This paper explores the nonlinear dynamics and mode coupling in spin transfer nano-oscillators, demonstrating how vortex core configurations influence microwave signal properties and reducing linewidth broadening for improved device performance.

Contribution

It reveals how vortex core polarity control affects coupled mode behavior and nonlinear linewidth, advancing spintronic device tunability.

Findings

Microwave signal features depend on vortex core polarities.

Changing effective damping reduces nonlinear linewidth broadening.

Control of vortex configurations enhances spintronic device performance.

Abstract

By investigating thoroughly the tunable behavior of coupled modes, we highlight how it provides new means to handle the properties of spin transfer nano-oscillators. We first demonstrate that the main features of the microwave signal associated with coupled vortex dynamics i.e. frequency, spectral coherence, critical current, mode localization, depends drastically on the relative vortex core polarities. Secondly we report a large reduction of the nonlinear linewidth broadening obtained by changing the effective damping through the control of the core configuration. Such a level of control on the nonlinear behavior reinforces our choice to exploit the microwave properties of collective modes for applications of spintronic devices in novel generation of integrated telecommunication devices.