Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets

Liang, Jiajuan; Yu, Jianhe; J, Chen; Qin, Minghui; Zeng, Min; Lu, Xubing; Gao, Xingsen; Jm, Liu

doi:10.1088/1367-2630/aac24c

Cited by 53 publications

(44 citation statements)

References 46 publications

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“…In addition, several frustrated magnets such as the triangular antiferromagnets are predicted to host the skyrmion lattice phase . Instead of the DM interaction, the competition between the nearest‐neighbor (NN) and next‐nearest‐neighbor (NNN) interactions is essential for stabilizing the skyrmions . Moreover, the first observation of skyrmionic magnetic bubbles formed at room temperature has been reported experimentally in the frustrated kagome Fe 3 Sn 2 magnet, well confirming the earlier predictions.…”

supporting

confidence: 77%

Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Huang

et al. 2019

Physica Rapid Research Ltrs

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The phase diagrams of the frustrated classical spin model with the Dzyaloshinskii–Moriya (DM) interaction on the Shastry–Sutherland lattice are studied by means of Monte Carlo simulations. For ferromagnetic next‐nearest‐neighboring (J2) interactions, the introduced exchange frustration enhances the effect of the DM interaction, which enlarges the magnetic field‐range with the skyrmion lattice phase and increases the skyrmion density. For antiferromagnetic J2 interactions, the so‐called 2q phase (two‐sublattice skyrmion crystal) and the spin‐flop phase are observed, and their stabilizations are closely dependent on the DM interaction and J2 interaction, respectively. The simulated results are qualitatively explained from the energy competitions among these couplings, which provide an important guidance for finding skyrmion crystals in frustrated magnets.

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supporting

confidence: 77%

Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Huang

et al. 2019

Physica Rapid Research Ltrs

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“…However, the dynamics of magnetic bimerons driven by different external forces as well as the static properties of different forms of bimerons still remain elusive, especially for the bimerons in frustrated magnetic systems. Some most recent studies have focused on the existence and manipulation of skyrmions in frustrated magnetic systems [48,[64][65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83]. Therefore, it is also imperative to study bimerons in frustrated magnetic systems, of which the physical properties are essential for designing future bimeron-based device applications.…”

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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“…The simulation is performed on an 18×18 (16×40) square lattice to simulate isolated (multiple) skyrmions. Furthermore, we constrain the spin at the edges by S z =1 to reduce the finite lattice size effect for the case of isolated skyrmions [35], while apply the periodic/free boundary condition along the direction perpendicular to/parallel to the field gradient for the case of multiple skyrmions. The finite-size effect is occasionally checked by the simulation on a 100×100 system size, which is confirmed to hardly affect our main conclusion.…”

Section: Model and Methodsmentioning

confidence: 99%

Dynamics of distorted skyrmions in strained chiral magnets

Chen

Liang

et al. 2018

New J. Phys.

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In this work, we study the microscopic dynamics of distorted skyrmions in strained chiral magnets (Shibatak et al 2015 Nat. Nanotechnol. 10 589) under gradient magnetic field and electric current by Landau-Lifshitz-Gilbert simulations of the anisotropic spin model. It is observed that the dynamical responses are also anisotropic, and the velocity of the distorted skyrmion is periodically dependent on the directions of the external stimuli. Furthermore, in addition to the uniform motion, our work also demonstrates an anti-phase harmonic vibration of the two skyrmions in nanostripes, and the frequencies can be effectively modulated by the anisotropic Dzyaloshinskii-Moriya interaction. The simulated results are well explained by Thiele's theory, which may provide useful information in understanding the dynamics of the distorted skyrmions.

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Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets

Cited by 53 publications

References 46 publications

Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Skyrmion Crystals in Frustrated Shastry–Sutherland Magnets

Static and dynamic properties of bimerons in a frustrated ferromagnetic monolayer

Dynamics of distorted skyrmions in strained chiral magnets

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