Magnonic key based on skyrmion clusters

E Saavedra,J Escrig,F Tejo,N Vidal-Silva

doi:10.1038/s41598-021-02285-0

Abstract

In this work, we report the excitation of spin-waves modes in skyrmion clusters hosted in Co/Pt nanodots by applying an in-plane magnetic field pulse. The direction at which the magnetic field is applied enables the excitation of five main spin-waves modes that are understood in terms of only azimuthal-like modes, which are shown to be strongly dependent on the number of skyrmions stabilized in the system. This feature converts the present system in a mechanism to activate and suppress a set of given modes, which in turn we propose to be utilized as a magnonic key based skyrmion cluster. Our results could be useful in manufacturing potential magnonic logic devices based in skyrmionic textures.

Highlights

In this work, we report the excitation of spin-waves modes in skyrmion clusters hosted in Co/Pt nanodots by applying an in-plane magnetic field pulse
The stabilization of skyrmion textures stems from the distinct energy contributions in the system, being the main of them the Dzyaloshinskii–Moriya Interaction (DMI)[8,9], which is a manifestation of the spin-orbit coupling (SOC) and the breaking of inversion symmetry
The interfacial DMI promotes the apparition of Neel skyrmions, which are the focus of this work, and they are characterized by its non-zero radial component in the magnetization v ector[12]

Summary

Introduction

We report the excitation of spin-waves modes in skyrmion clusters hosted in Co/Pt nanodots by applying an in-plane magnetic field pulse. By means of micromagnetic simulations, we systematically determined the main resonance peaks and the associated spin-wave modes in the system, which provides a first approach to skyrmion clusters dynamics based on in-plane excitations.

Results

Conclusion