Optically controlled ultrafast dynamics of skyrmion in antiferromagnets

Guan, Siyin; Liu, Y.; Hou, Zhipeng; Chen, Deyang; Fan, Zhen; Zeng, Min; Lu, Xubing; Gao, Xingsen; Qin, Minghui; Liu, J.-M.

doi:10.1103/physrevb.107.214429

Cited by 8 publications

(1 citation statement)

References 66 publications

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“…As promising data storage units, topologically protected magnetic textures, such as magnetic skyrmions, are much attractive in high-density and low-power-consuming spintronic devices attributing to their small size. [1][2][3][4][5][6] As most of the previous studies focus mainly on ferromagnetic and antiferromagnetic systems, stable ferrimagnetic (FiM) skyrmion have recently attracted extensive attentions because of their tunable net angular momentum density δ s . Recently, it was demonstrated both theoretically and experimentally that, in a FiM magnetic film, skyrmion can be stabilized by a Dzyaloshinskii-Moriya (DM) interaction with a rather good robustness against disturbances, thanks to their topological characteristics.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

Xu,

Yang,

Liu

et al. 2024

Physica Rapid Research Ltrs

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The topological skyrmions in ferrimagnet systems provide new opportunities to investigate the fundamental spin dynamics. Effective manipulation of ferrimagnet skyrmion motion is a vital task for future spintronics applications, motivating intense research on magnetization dynamics with voltage as driving sources. In this work, we investigated the skyrmion in ferromagnets driven by voltage controlled magnetic anisotropy gradients, which tends to move towards the low anisotropy area and has a constant velocity. We reported our Thiele’s theory analysis on the velocities of the skyrmion dependences on the anisotropy gradient, the net angular momentum density and the damping coefficient, which are confirmed nicely by the atomistic simulations. It is demonstrated that the velocity of the skyrmion reaches to a maximum value at a nonzero net angular momentum density δ s different from the domain wall and the Hall angle of ferrimagnet skyrmions can be controlled by δ s . Our results are useful for the understanding of ferrimagnet skyrmion dynamics and may open an alternative way for the design of ferrimagnet spintronic devices.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

Xu,

Yang,

Liu

et al. 2024

Physica Rapid Research Ltrs

View full text Add to dashboard Cite

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OAM Driven Nucleation of Sub‐50 nm Compact Antiferromagnetic Skyrmions

Mallick,

Ye,

Boutu

et al. 2024

Adv Funct Materials

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Owing to their high mobility and immunity to topological deflection, skyrmions in antiferromagnetic (AFM) systems are gaining attention as a potential solution for next‐generation magnetic data storage. Synthetic antiferromagnets (SAFs) offer a promising avenue to tune the properties of the individual magnetic layers, facilitating the conditions necessary for skyrmions to be used in practical devices. Despite recent advancements achieving fast skyrmion mobility, the nucleation of small and rigid circular skyrmions without an external field remains challenging in SAFs. Theoretical predictions suggest that optical vortex (OAM) beams can stabilize skyrmionic spin textures by transferring their spin and orbital angular momentum to the magnetic material. Here, this intriguing proposal is delved into and the creation of sub‐50 nm compact skyrmions in SAFs using OAM beams is successfully demonstrated, eliminating the need for external magnetic fields. Additionally, the results underscore the importance of beam energy and the number of pulses, as both factors play critical roles in the stabilization of these AFM skyrmionic textures. This breakthrough is significant as it paves the way for stabilizing true zero‐field skyrmions in AFM systems, where magnetization is minimally affected by external magnetic fields. This work will open a potential avenue for stabilizing small, compact skyrmions in antiferroic systems, facilitating their implementation in logic and memory devices.

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Controlled Separation of Skyrmions and Antiskyrmions by Kitaev Interaction

Guan,

Duan,

Zou

2024

Nano Lett.

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As topological quasi-particles in magnetic materials, skyrmions and antiskyrmions show potential in spintronics for information storage and computing. However, effectively controlling and separating these entities remain significantly challenging. Here, we demonstrate that anisotropic Kitaev exchange can distinctly influence the static and dynamic behaviors for skyrmions and antiskyrmions, thus aiding their manipulation and separation. Employing the monolayer frustrated magnet NiBr 2 as a model system, we construct a magnetic field−strain phase diagram to explore the strain-controlled stability of these topological structures. The introduction of the Kitaev term breaks the energy degeneracy among magnetic structures with various helicities, leading to a translation−rotation mode transition with an increase in current. Importantly, due to their different rotational symmetries, the skyrmion and antiskyrmion show distinct critical behaviors and rotational dynamics, which are governed by the Kitaev parameters. These phenomena enable the design of two proof-of-concept spintronics devices, i.e., a skyrmion separator and a non-gate logic unit.

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Optically controlled ultrafast dynamics of skyrmion in antiferromagnets

Cited by 8 publications

References 66 publications

Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

Skyrmion Motion in Ferrimagnets Driven by Magnetic Anisotropy Gradient

OAM Driven Nucleation of Sub‐50 nm Compact Antiferromagnetic Skyrmions

Controlled Separation of Skyrmions and Antiskyrmions by Kitaev Interaction

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