Electronic Noise of a Single Skyrmion

TL;DR

This study investigates the electronic noise characteristics of a single skyrmion in a magnetic thin film, revealing how thermal fluctuations and spin currents influence noise types and offering insights for reliable skyrmion device development.

Contribution

It provides a comprehensive analysis of skyrmion electronic noise under various pinning regimes, highlighting noise as a tool for characterizing skyrmion pinning conditions.

Findings

Thermally induced noise exhibits a 1/f signature in strong pinning regimes.

Random telegraph noise appears in intermediate pinning regimes.

Both thermal and current-induced noise are observed in weak pinning regimes.

Abstract

To enable the practical use of skyrmion-based devices, it is essential to achieve a balance between energy efficiency and thermal stability, while also ensuring reliable electrical detection against noise. Understanding how a skyrmion interacts with material disorder and external perturbations is thus essential. Here we investigate the electronic noise of a single skyrmion under the influence of thermal fluctuations and spin currents in a magnetic thin film. We detect the thermally induced noise with a 1/f signature in the strong pinning regime but a random telegraph noise in the intermediate pinning regime. Both the thermally dominated and current-induced telegraph-like signals are detected in the weak pinning regime. Our results provide a comprehensive electronic noise picture of a single skyrmion, demonstrating the potential of noise fluctuation as a valuable tool for characterizing the pinning condition of a skyrmion. These insights could also aid in the development of low-noise and reliable skyrmion-based devices.