Abstract
An investigation of spin waves interacting with antiferromagnetic spin textures is meaningful for future spintronic and magnonic-based memory and logic applications. In this work, we numerically study the skyrmion dynamics driven by circularly polarized spin waves in antiferromagnets and propose a method of suppressing the Hall motion. It is demonstrated that the application of two circularly polarized spin waves with opposite chirality allows the skyrmion motion straightly along the intersection line of the two spin wave sources. The skyrmion speed depending on these parameters of the spin waves and system is estimated, and a comparison with other methods is provided. Furthermore, two depinning behaviors of the skyrmion related to the strengths of the defect are also observed in the simulations. Thus, the proposed method could be used in precisely modulating the skyrmion dynamics, contributing to skyrmion-based memory device design.
Highlights
Skyrmion, a topologically protected particle-like magnetic structure, is considered as a promising candidate for spintronic applications like racetrack memories due to some of its attractive features including nanoscale in size, low critical driving current, and high stability [1,2,3,4,5,6]
The generation of the spin wave could be realized through applying an oscillating magnetic field with intensity h0 400–800 mT and frequency ω ∼ 2 THz [38], or by injecting spin current with intended polarizations [39, 40]
We propose a method to suppress the skyrmion Hall motion driven by circularly polarized spin waves in antiferromagnets
Summary
A topologically protected particle-like magnetic structure, is considered as a promising candidate for spintronic applications like racetrack memories due to some of its attractive features including nanoscale in size, low critical driving current, and high stability [1,2,3,4,5,6]. Skyrmion dynamics driven by spin-polarized current in ferromagnets has been widely studied, and the so-called skyrmion Hall motion induced by the Magnus force is reported. In this case, the skyrmion moves deviating from the direction of the driving force and could be restricted or even annihilated by element edges of related devices [7,8,9,10]. It is predicted that the linearly polarized spin wave with particular polarization directions drives the AFM skyrmion straightly along its propagation direction without any Hall motion [27], while the strict limitation of the polarization directions affects stable application. It is worth noting that the generating of the two kinds of spin waves with opposite chirality in the two halves of the system does not consume more energy than the injecting of single handed spin wave in the whole system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
