Controllable interskyrmion attractive interactions and resulting skyrmion-lattice structures in two-dimensional chiral magnets with in-plane anisotropy

Kameda, Mai; Koyama, Rio; Nakajima, Takuro; Kawaguchi, Yuki

doi:10.1103/physrevb.104.174446

Cited by 3 publications

(6 citation statements)

References 77 publications

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“…It is to be noted that, in the other arrangements and pairs, one or both of the two deformed topological particles show a significant increase in energy (Figures S9–S19). Many theoretical and experimental studies have shown the deformations of skyrmions so far, such as in motion by spin torque, ,− in a skyrmion structural transition, , and caused by external and internal fields. − Therefore, our findings that the deformation of the topological particles exerts a significant influence on the magnetic energies and energy landscape could also provide new insights into other properties associated with the deformation. ,− …”

Section: Resultsmentioning

confidence: 71%

“…In summary, we have unveiled a new type of skyrmion–antiskyrmion interaction in the Heusler material and the influences and cause of deformed skyrmions and antiskyrmions. Our study may provide new insights into the unresolved properties resulting from interacting skyrmions and antiskyrmions in condensed matter and other properties of deformed skyrmions in chiral magnets and multilayers. ,− Further, our results may conduce to opening a new subject as the nonlinear current response properties in the presence of repulsively interacting skyrmions and antiskyrmions and may offer a guide for developing skyrmion–antiskyrmion-based spintronic devices. , …”

Section: Discussionmentioning

confidence: 86%

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Nanoscale Characteristics of a Room-Temperature Coexisting Phase of Magnetic Skyrmions and Antiskyrmions for Skyrmion–Antiskyrmion-Based Spintronic Applications

Shimizu

Nagase

et al. 2022

ACS Appl. Nano Mater.

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Theoretical studies have predicted that interactions between magnetic skyrmions and antiskyrmions give rise to various properties, such as unique arrangements, pair annihilation, topological transformation, and rectilinear and trochoidal motions that do not appear in only skyrmions or antiskyrmions. Recently, experimental studies have discovered that a Heusler material with the anisotropic Dzyaloshinskii–Moriya interaction shows a coexisting phase at 268 K and in-plane magnetic field-induced topological transformation of elliptical skyrmions and square-shaped antiskyrmions. Therefore, experimentally observing the coexisting phase and the topological transformation could be promising for developing skyrmion–antiskyrmion-based spintronics. However, such interactions and the detailed transformation mechanism remain unrevealed and unclear, respectively. Using Lorentz transmission electron microscopy experiments and micromagnetic simulations, we comprehensively study the properties in a coexisting phase of skyrmions and antiskyrmions in a Heusler material, Mn1.3Pt1.0Pd0.1Sn. Control of dipolar interaction (the sample thickness) allows us to realize a room-temperature coexisting phase. We find that the topological transformation occurs stochastically rather than deterministically, which can be explained by considering the magnetic point group and the direction of an in-plane magnetic field. We further observe isotropic long-range repulsive interaction between skyrmions and antiskyrmions in contrast to the conventional thought of the relative-position- and helicity-dependent short-range pairwise interactions, and deformation of skyrmions and antiskyrmions depending on the distance between them. Our simulations show that the deformation exerts significant influence on the magnetic energies and the energy landscape, contributing to the interaction. Our results provide insight into coexisting phases of skyrmions and antiskyrmions and a guide for developing skyrmion–antiskyrmion-based spintronics.

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Section: Resultsmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 86%

Nanoscale Characteristics of a Room-Temperature Coexisting Phase of Magnetic Skyrmions and Antiskyrmions for Skyrmion–Antiskyrmion-Based Spintronic Applications

Shimizu

Nagase

et al. 2022

ACS Appl. Nano Mater.

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“…In [23], the authors substitute numerical solutions for the tails of specific solitons at given couplings into (48), for a variety of energy functionals. However, here we continue to an explicit expression for V AB lin , which has certain advantages as discussed in the introduction.…”

Section: The Interaction Potential In Terms Of Soliton Tailsmentioning

confidence: 99%

“…However, for the following we keep the number of spatial dimensions to two and the target space to S 2 . The steps of this argument are not new [17,23], but the purpose of this discussion is to show its generality and that it does not require a superposition ansatz. Throughout we think in terms of the infinite-dimensional configuration space consisting of all possible configurations of the magnetisation field.…”

Section: B Interaction Potential For General Energy Functionalmentioning

confidence: 99%

“…The latter of these drew on methods used, for example, in [17,18]. The interaction potential of magnetic skyrmions in a tilted magnetic field has been numerically simulated [22] and partially calculated [23], but an expression for the analytical potential in terms of the separation of the skyrmions has not been given. The advantages of an explicit formula are several: firstly, it gives new understanding of the interaction potential in terms of multipoles in a U(1) gauge theory which is, in principle, applicable to solitons of any degree.…”

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confidence: 99%

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Stability and asymptotic interactions of chiral magnetic skyrmions in a tilted magnetic field

Barton-Singer

Schroers

2023

SciPost Phys.

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Using a general framework, interaction potentials between chiral magnetic solitons in a planar system with a tilted external magnetic field are calculated analytically in the limit of large separation. The results are compared to previous numerical results for solitons with topological charge \pm 1±1. A key feature of the calculation is the interpretation of Dzyaloshinskii-Moriya interaction (DMI) as a background SO(3)SO(3) gauge field. In a tilted field, this leads to a U(1)U(1)-gauged version of the usual equation for spin excitations, leading to a distinctive oscillating interaction profile. We also obtain predictions for skyrmion stability in a tilted field which closely match numerical observations.

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Mechanisms and Control of Inter-Skyrmion Attractions

Kameda,

Kobayashi,

Kawaguchi

2023

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)

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Controllable interskyrmion attractive interactions and resulting skyrmion-lattice structures in two-dimensional chiral magnets with in-plane anisotropy

Cited by 3 publications

References 77 publications

Nanoscale Characteristics of a Room-Temperature Coexisting Phase of Magnetic Skyrmions and Antiskyrmions for Skyrmion–Antiskyrmion-Based Spintronic Applications

Nanoscale Characteristics of a Room-Temperature Coexisting Phase of Magnetic Skyrmions and Antiskyrmions for Skyrmion–Antiskyrmion-Based Spintronic Applications

Stability and asymptotic interactions of chiral magnetic skyrmions in a tilted magnetic field

Mechanisms and Control of Inter-Skyrmion Attractions

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