Particle-continuum duality of skyrmions

Wang, Xiang Rong; Hu, X. C.

doi:10.1103/physrevb.107.174412

Cited by 4 publications

(1 citation statement)

References 73 publications

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“…Therefore, we expect that, at certain fields, even charged SKs have higher energy; thus, they cannot be achieved by means of field-induced annihilation. This behaviour is fundamentally different from that of composite SKs, whereby one SK after another is annihilated during the field-driven transformation 16 , 17 . However, a more detailed theoretical study on the energetical stability of the higher-order SKs and ASKs is required to fully understand these topological transformations.…”

Section: The Origin Of High-order Spin Objectsmentioning

confidence: 72%

Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature

Hassan,

Koraltan,

Ullrich

et al. 2024

Nat. Phys.

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Magnetic skyrmions are localized, stable topological magnetic textures that can move and interact with each other like ordinary particles when an external stimulus is applied. The efficient control of the motion of spin textures using spin-polarized currents opened an opportunity for skyrmionic devices such as racetrack memory and neuromorphic or reservoir computing. The coexistence of skyrmions with high topological charge in the same system promises further possibilities for efficient technological applications. In this work, we directly observe dipolar skyrmions and antiskyrmions with arbitrary topological charge in Co/Ni multilayers at room temperature. We explore the dipolar-stabilized spin objects with topological charges of up to 10 and characterize their nucleation process, their energy dependence on the topological charge and the effect of the material parameters on their stability. Furthermore, our micromagnetic simulations demonstrate spin-transfer-induced motion of these spin objects, which is important for their potential device application.

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Section: The Origin Of High-order Spin Objectsmentioning

confidence: 72%

Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature

Hassan,

Koraltan,

Ullrich

et al. 2024

Nat. Phys.

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Spin-wave-driven tornado-like dynamics of three-dimensional topological magnetic textures

Qiu,

Shen,

Shen

2024

Commun Phys

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The abundant topological magnetic textures in three-dimensional systems provide opportunities to investigate the fundamental spin dynamics and realize spintronic applications. The dynamics of such magnetic textures have however rarely been studied, especially for those driven by spin waves, which allow applications with ultralow energy consumption and ease of implementation even in insulating systems. Here, we report our micromagnetic simulations on the spin-wave-driven dynamics of a skyrmion tube (SkT) and chiral bobber (ChB) in a thick magnetic film. We predict tornado-like dynamics in both SkT and ChB, where the topological centers present a lateral rotation with the rotation centers forming a distorted profile in the thickness direction. While the velocity of SkT scales with the driving power, the ChB motion presents a threshold in the driving field, which is found to depend linearly on its penetration length. This distinct behavior could be useful to differentiate ChB from SkT and estimate its penetration length experimentally.

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Global rotation of skyrmion bags under vertical microwave fields

Bo,

Zhao,

Zhang

et al. 2024

Journal of Applied Physics

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Magnetic skyrmion bags are composite topological spin textures with arbitrary topological charges. Here, we computationally study the transient rotational motion of skyrmion bags, which is characterized by a global rotation of inner skyrmions around the central point. Distinct from conventional rotational modes found in skyrmions, the observed rotation is a forced motion associated with the breathing mode induced solely by vertical microwave fields. The driving force behind this rotation originates from the interactions between outer and inner skyrmions, with the angular velocity determined by the phase difference resulting from their asynchronous breathing behaviors. It is also found that skyrmion bags with larger skyrmion numbers are more conducive to the occurrence of the rotation. Our results are useful for understanding the cluster dynamics of complex topological spin textures driven by dynamic fields.

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Particle-continuum duality of skyrmions

Cited by 4 publications

References 73 publications

Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature

Dipolar skyrmions and antiskyrmions of arbitrary topological charge at room temperature

Spin-wave-driven tornado-like dynamics of three-dimensional topological magnetic textures

Global rotation of skyrmion bags under vertical microwave fields

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