Transformation between meron and skyrmion topological spin textures in a chiral magnet

Yu, Xiaojiang; Koshibae, Wataru; Tokunaga, Yusuke; Shibata, Kiyou; Taguchi, Y.; Nagaosa, Naoto; Tokura, Y.

doi:10.1038/s41586-018-0745-3

Cited by 389 publications

(345 citation statements)

References 31 publications

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“…In 2018, as shown in Fig. 14(d), the magnetic field-driven transformation between meron-antimeron pair lattice and skyrmion lattice was experimentally realized in a chiral magnet by Yu et al [248]. Therefore, we have also introduced and put forward an overview on recent skyrmion research of different material systems as well as different skyrmion counterparts.…”

Section: (B)]mentioning

confidence: 92%

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Zhang¹,

Zhou²,

Song³

et al. 2020

J. Phys.: Condens. Matter

387

302

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The field of skyrmionics has been actively investigated across a wide range of topics during the last decade. In this topical review, we review and discuss key results and findings in skyrmionics since the first experimental observation of magnetic skyrmions in 2009. We particularly focus on the theoretical, computational and experimental findings and advances that are directly relevant to the spintronic applications based on magnetic skyrmions, i.e. their writing, deleting, reading and processing driven by magnetic field, electric current and thermal energy. We then review several potential applications including information storage, logic computing gates and non-conventional devices such as neuromorphic computing devices. Finally, we discuss possible future research directions on magnetic skyrmions, which also cover rich topics on other topological textures such as antiskyrmions and bimerons in antiferromagnets and frustrated magnets.

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Section: (B)]mentioning

confidence: 92%

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Zhang¹,

Zhou²,

Song³

et al. 2020

J. Phys.: Condens. Matter

387

302

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“…Recent reports have suggested the existence and manipulation of bimerons in different magnetic materials, including ferromagnets [46,47,49,[53][54][55][56]59], antiferromagnets [51,52,57], and frustrated magnets [48]. In particular, a lattice of bimerons (i.e., a square lattice of merons and antimerons) has been observed in chiral-lattice magnet Co 8 Zn 9 Mn 3 by using Lorentz transmission electron microscope in 2018 [63].…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

et al. 2020

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Magnetic bimeron is a topological counterpart of skyrmions in in-plane magnets, which can be used as spintronic information carrier. We report the static properties of bimerons with different topological structures in a frustrated ferromagnetic monolayer, where the bimeron structure is characterized by the vorticity Qv and helicity η. It is found that the bimeron energy increases with Qv, and the energy of an isolated bimeron with Qv = ±1 depends on η. We also report the dynamics of frustrated bimerons driven by the spin-orbit torques, which depend on the strength of the damping-like and field-like torques. We find that the isolated bimeron with Qv = ±1 can be driven into linear or elliptical motion when the spin polarization is perpendicular to the easy axis. We numerically reveal the damping dependence of the bimeron Hall angle driven by the damping-like torque. Besides, the isolated bimeron with Qv = ±1 can be driven into rotation by the damping-like torque when the spin polarization is parallel to the easy axis. The rotation frequency is proportional to the driving current density. In addition, we numerically demonstrate the possibility of creating a bimeron state with a higher or lower topological charge by the current-driven collision and merging of bimeron states with different Qv. Our results could be useful for understanding the bimeron physics in frustrated magnets.

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“…If the Magnus force is absent, the skyrmion dynamics would be con- sistent with what is found in an overdamped system and the edge transport would be absent. There are also other possible systems that could exhibit edge currents, such as the trochoidal motion of skyrmions in certain bilayer systems [60] as well as the dynamics of anti-skyrmion lattices [77], meron lattices [78], or polar skyrmions [79].…”

Section: Discussionmentioning

confidence: 99%

Chiral edge currents for ac-driven skyrmions in confined pinning geometries

Reichhardt

2019

Phys. Rev. B

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We show that ac driven skyrmion lattices in a weak pinning channel confined by regions of strong pinning exhibit edge transport carried by skipping orbits while skyrmions in the bulk of the channel undergo localized orbits with no net transport. The magnitude of the edge currents can be controlled by varying the amplitude and frequency of the ac drive or by changing the ratio of the Magnus force to the damping term. We identify a localized phase in which the orbits are small and edge transport is absent, an edge transport regime, and a fluctuating regime that appears when the ac drive is strong enough to dynamically disorder the skyrmion lattice. We also find that in some cases, multiple rows of skyrmions participate in the transport due to a drag effect from the skyrmionskyrmion interactions. The edge currents are robust for finite disorder and should be a general feature of skyrmions interacting with confined geometries or inhomogeneous disorder under an ac drive. We show that similar effects can occur for skyrmion lattices at interfaces or along domain boundaries for multiple coexisting skyrmion species. The edge current effect provides a new method to control skyrmion motion, and we discuss the connection of these results with recent studies on the emergence of edge currents in chiral active matter systems and gyroscopic metamaterials.

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Transformation between meron and skyrmion topological spin textures in a chiral magnet

Cited by 389 publications

References 31 publications

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Chiral edge currents for ac-driven skyrmions in confined pinning geometries

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