Static and Dynamics of Twisted Skyrmion Tubes in Frustrated Magnets

TL;DR

This paper explores the stability, topology, and dynamics of twisted skyrmion tubes in frustrated magnets, revealing their potential for low-power spintronic applications through electric current-driven helicity control.

Contribution

It introduces the concept of twisted skyrmion tubes with a position-dependent helicity and analyzes their stability, topology, and electric current-driven dynamics in frustrated magnetic systems.

Findings

Twisted skyrmion tubes exhibit a helicoid texture interpolating between Neel- and hedgehog-like skyrmions.

Helicity dynamics can be controlled by spin-orbit torque induced by electric currents.

Potential applications in low-power magnetic storage and nanodevices are demonstrated.

Abstract

Stable three-dimensional topological skyrmion structures in frustrated magnets are investigated. The texture exhibits a helicoid pattern along the vertical direction, described by a position-dependent helicity, which interpolates between Neel- and hedgehog-like two-dimensional skyrmions, characterized by the Hopf index, and is referred to as "twisted skyrmion tubes" (TSkTs). The stability and topology of TSkTs are achieved by competing next-nearest-neighbor exchange interactions, the thickness of the magnet, and the applied magnetic field. The dynamical behavior of a twisted structure in frustrated magnets is determined. Specifically, we derive that the helicity dynamics of the TSkT can be driven by an electric current resulting from spin-orbit torque interaction. Furthermore, we address the study of the electronic scattering problem using a spin-orbit-torque-driven TSKT, which offers promising applications for low-power storage nanodevices and nanobatteries with enhanced control.