Biskyrmion states and their current-driven motion in a layered manganite

Yu, Xiaojiang; Tokunaga, Yusuke; Kaneko, Yoshio; Zhang, W. Z.; Kimoto, Koji; Matsui, Y.; Taguchi, Y.; Tokura, Y.

doi:10.1038/ncomms4198

Cited by 278 publications

(309 citation statements)

References 33 publications

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“…The green and red regions shown in Figure 2b correspond to in-plane anti-parallel magnetic domains, while the black regions represent the out-of plane magnetic domains. The revolving behavior of the biskyrmions under a vertical magnetic field is similar to that reported previously [5,7,8,21,22] . The dynamics of formation and disappearance of the biskyrmions with increasing applied magnetic field were successfully recorded by using insitu Lorentz TEM (see Supplementary Movie, SI).…”

supporting

confidence: 89%

“…clearly indicates that each spin configuration is composed of two single skyrmions with opposite magnetic helicities; that is, each skyrmion has clockwise (CW) and counterclockwise (CCW) spin curls with an out-of-plane magnetization culminating at the core. This spin configuration is the same as that of biskyrmions reported by Yu et al [22] with N s =2. We define the polarity of constituent skyrmions as plus (+) for CW skyrmions and minus (-) for CCW skyrmions.…”

supporting

confidence: 86%

“…including Refs. [1][2][3][4][5][6][7][8][9][10][11][12], [22], [29][30][31], [33]. The red solid squares indicate the experimental data based on the in-situ Lorentz TEM observations.…”

Section: Supporting Informationmentioning

confidence: 99%

“…As in bilayered magnetite [22] , the magnetic dipolar interaction combined with the low crystal symmetry in such magnets might provide additional stability to skyrmions. In what follows, we describe a hexagonal magnet, MnNiGa, that has a layered Ni 2 In-type structure [23] (space group P63/mmc) with alternating stacks of Mn atomic layers and Ni-Ga atomic layers along the c-axis (Figure 1a).…”

mentioning

confidence: 99%

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A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

et al. 2016

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Magnetic skyrmions are topologically protected vortex-like nanometric spin textures that have recently received growingly attention for their potential applications in future highperformance spintronic devices. Such unique mangetic naondomains have been recently discovered in bulk chiral magnetic materials, such as MnSi [1][2][3][4] , FeGe [5,6] , FeCoSi [7] , Cu 2 OSeO 3 [8][9][10] , -Mn-type Co-Zn-Mn [11] , and also GaV 4 S 8[12] a polar magnet. The crystal structure of these materials is cubic and lack of centrosymmetry, leading to the existence of Dzyaloshinskii-Moriya (DM) interactions. Unlike the conventional spin configurations, such as helical or conical, that are usually found in chiral magnets, a magnetic skyrmion has a particle-like swirling-spin configuration characterized by a topological index called the skyrmion number [13,14] . The nontrivial topology of magnetic skyrmions results in a number of

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supporting

confidence: 89%

supporting

confidence: 86%

“…including Refs. [1][2][3][4][5][6][7][8][9][10][11][12], [22], [29][30][31], [33]. The red solid squares indicate the experimental data based on the in-situ Lorentz TEM observations.…”

Section: Supporting Informationmentioning

confidence: 99%

mentioning

confidence: 99%

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A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

et al. 2016

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“…Since this initial discovery there has been tremendous growth in the field as an increasing number of materials have been found that can support a skyrmion phase [3][4][5][6][7][8][9][10] . There are also numerous proposals on how to stabilize skyrmion states by utilizing different materials properties or bilayers [11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Quantized transport for a skyrmion moving on a two-dimensional periodic substrate

2015

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We examine the dynamics of a skyrmion moving over a two-dimensional periodic substrate utilizing simulations of a particle-based skyrmion model. We specifically examine the role of the non-dissipative Magnus term on the driven motion and the resulting skyrmion velocity-force curves. In the overdamped limit, there is a depinning transition into a sliding state in which the skyrmion moves in the same direction as the external drive. When there is a finite Magnus component in the equation of motion, a skyrmion in the absence of a substrate moves at an angle with respect to the direction of the external driving force. When a periodic substrate is added, the direction of motion or Hall angle of the skyrmion is dependent on the amplitude of the external drive, only approaching the substrate-free limit for higher drives. Due to the underlying symmetry of the substrate the direction of skyrmion motion does not change continuously as a function of drive, but rather forms a series of discrete steps corresponding to integer or rational ratios of the velocity components perpendicular ( V ⊥ ) and parallel ( V || ) to the external drive direction: V ⊥ / V || = n/m, where n and m are integers. The skyrmion passes through a series of directional locking phases in which the motion is locked to certain symmetry directions of the substrate for fixed intervals of the drive amplitude. Within a given directionally locked phase, the Hall angle remains constant and the skyrmion moves in an orderly fashion through the sample. Signatures of the transitions into and out of these locked phases take the form of pronounced cusps in the skyrmion velocity versus force curves, as well as regions of negative differential mobility in which the net skyrmion velocity decreases with increasing external driving force. The number of steps in the transport curve increases when the relative strength of the Magnus term is increased. We also observe an overshoot phenomena in the directional locking, where the skyrmion motion can lock to a Hall angle greater than the clean limit value and then jump back to the lower value at higher drives. The skyrmion-substrate interactions can also produce a skyrmion acceleration effect in which, due to the non-dissipative dynamics, the skyrmion velocity exceeds the value expected to be produced by the external drive. We find that these effects are robust for different types of periodic substrates. Using a simple model for a skyrmion interacting with a single pinning site, we can capture the behavior of the change in the Hall angle with increasing external drive. When the skyrmion moves through the pinning site, its trajectory exhibits a side step phenomenon since the Magnus term induces a curvature in the skyrmion orbit. As the drive increases, this curvature is reduced and the side step effect is also reduced. Increasing the strength of the Magnus term reduces the range of impact parameters over which the skyrmion can be captured by a pinning site, which is one of the reasons that strong Magnus force effects reduce the...

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Spontaneous Topological (Anti)meron Chains in the Domain Walls of Centrosymmetric Rare‐Earth Magnet

Xu,

Wang,

et al. 2024

Adv Funct Materials

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Exploration and manipulation of topological protected magnetic swirls, such as skyrmion, antiskyrmion, meron, and vortex, holds significance for fundamental research and practical applications in high‐density magnetic information storage and spintronics because of their high storage density and low driven current. This study unveils the existence of field‐free spontaneous (anti)meron chains with a topological charge of ±1/2 in the centrosymmetric rare‐earth magnet Tb6Co2.17Si2.5 via in situ real‐space observation. The spin reorientation transition from in‐plane to uniaxial anisotropy contributes to the spontaneous transformation from straight domain walls to topological (anti)meron chains and to stripe domains along the [110] zone axis during in situ cooling. The study further confirms the critical role of the noncollinear magnetic structure of Tb atoms in the formation of topological (anti)meron chains via real‐space observations, first‐principles calculations, and micromagnetic simulations. The spontaneous topological magnetic texture is strongly correlated with the 4f electrons of rare‐earth atoms, enriching and stimulating alternative generation mechanisms of topological spin textures from emerging rare‐earth magnets, and further applications in spintronics.

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Biskyrmion states and their current-driven motion in a layered manganite

Cited by 278 publications

References 33 publications

A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

A Centrosymmetric Hexagonal Magnet with Superstable Biskyrmion Magnetic Nanodomains in a Wide Temperature Range of 100–340 K

Quantized transport for a skyrmion moving on a two-dimensional periodic substrate

Spontaneous Topological (Anti)meron Chains in the Domain Walls of Centrosymmetric Rare‐Earth Magnet

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