Skyrmionium – high velocity without the skyrmion Hall effect

Kolesnikov, Alexander; Stebliy, Maxim E.; Samardak, Alexander S.; Ognev, A. V.

doi:10.1038/s41598-018-34934-2

Cited by 104 publications

(71 citation statements)

References 61 publications

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“…On the other hand, a magnetic skyrmionium is also a topological spin texture with Q ¼ 0. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] It has a doughnut-like out-of-plane spin structure and can be seen as the combination of two skyrmions with opposite Q. The magnetic skyrmionium can be generated by ultra-fast laser pulses and has been observed experimentally 38 to be stable for over 12 months.…”

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confidence: 99%

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Magnetic skyrmionium diode with a magnetic anisotropy voltage gating

Wang

Xia

Zhang

et al. 2020

Applied Physics Letters

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The magnetic skyrmionium can be seen as a coalition of two magnetic skyrmions with opposite topological charges and has potential applications in next-generation spintronic devices. Here, we report the current-driven dynamics of a skyrmionium in a ferromagnetic nanotrack with the voltage-controlled magnetic anisotropy. The pinning and depinning of a skyrmionium controlled by the voltage gate are investigated. The current-driven skyrmionium can be used to mimic the skyrmionium diode effect in the nanotrack with a voltage gate. We have further studied the skyrmionium dynamics in the nanotrack driven by a magnetic anisotropy gradient in the absence of spin current. The performance of a single wedge-shaped voltage gate at different temperatures is studied. Our results may provide useful guidelines for the design of voltage-controlled and skyrmionium-based spintronic devices.

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confidence: 99%

“…Due to the zero topological charge, the magnetic skyrmionium is free from the SkHE. The dynamics of the skyrmionium have been studied theoretically [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] and observed in experiments, [36][37][38][39] showing the potential of using skyrmioniums in next-generation spintronic devices.…”

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confidence: 99%

Magnetic skyrmionium diode with a magnetic anisotropy voltage gating

Wang

Xia

Zhang

et al. 2020

Applied Physics Letters

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“…The consequent decrease of the field leads to the tilting of the magnetization in the ring resulting in magnetization reversal inside the spot. The circular domain usually referred as "skyrmionium" is finally formed (Figure 4, SKM) [30,31]. Actually, the "skyrmionium" is a topologically trivial state, which can be considered as a pair of concentric magnetic skyrmions with opposite topological charges.…”

Section: Nomentioning

confidence: 99%

Artificial Dense Lattices of Magnetic Skyrmions

et al. 2019

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Multilayer Co/Pt films with perpendicular magnetic anisotropy are irradiated by focused a He+ ion beam to locally reduce the anisotropy value. The irradiated spots with the diameters of 100 and 200 nm are arranged in square lattices with the periods of 200 and 300 nm. The formation of nonuniform magnetic states within the spots was observed by magnetic force microscopy methods. We use the concentric distribution of the irradiation fluence within the spot to obtain the radial modulation of the anisotropy constant. This allows us to induce magnetic skyrmions during magnetization reversal of the system. The skyrmions remained stable at zero external magnetic field at room temperature. Magnetization hysteresis loops of the samples were investigated by magnetooptical methods and the results are in good agreement with micromagnetic simulations.

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“…Given that skyrmions can be effectively moved with electrical currents but are deflected from their trajectory due to the "skyrmion Hall effect" 6,7 , an extensive amount of attention has gone into the study of antiferromagnetic skyrmions 8 , where this effect should be suppressed 9,10 . Experimentally, the inhibition of this Hall effect has been observed for ferrimagnetic skyrmions in GdFeCo films 11 , synthetic antiferromagnetic skyrmion bubbles 12 and it is also expected to be absent for other exotic structures such as skyrmioniums 13,14 .…”

Section: Introductionmentioning

confidence: 96%

Chiral multiple-q and skyrmion phases induced by Rashba-Hund interactions in the kagome lattice

Villalba¹,

Albarracín²,

Cabra³

et al. 2022

Preprint

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Engineering non trivial topological phases in materials, specially skyrmion-like arrangements, has been of great interest in the last decade due to its potential technological applications. In this work, we study a model of electrons coupled to a magnetic texture in the kagome lattice interacting with magnetic moments via Rashba spin orbit coupling in the large Hund interaction limit. We obtain the effective spin Hamiltonian and study the emergent low temperature phases under an external magnetic field using large scale Monte Carlo simulations. We show that strong geometric frustration, characteristic of the kagome lattice, and the competition between the effective exchange, antisymmetric and anisotropic couplings, gives rise to a large variety of non-trivial topological phases. On the one hand, for antiferromagnetic exchange coupling a pseudo-antiferromagnetic skyrmion crystal is stabilized for a broad range of parameters. As the exchange coupling gets smaller, chiral single-q and double-q phases emerge. On the other hand, in the ferromagnetic case, even though the competition of the different interactions produce a series of exotic textures, a remarkable parallel may be drawn with the pure ferromagnetic model with antisymmetric interactions. Finally, for the special case where the exchange coupling is completely suppressed, we show that, coming from a higher temperature cooperative paramagnet, an "umbrella-like" plaquette order with semiextensive degeneracy is induced by the external magnetic field.

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Skyrmionium – high velocity without the skyrmion Hall effect

Cited by 104 publications

References 61 publications

Magnetic skyrmionium diode with a magnetic anisotropy voltage gating

Magnetic skyrmionium diode with a magnetic anisotropy voltage gating

Artificial Dense Lattices of Magnetic Skyrmions

Chiral multiple-q and skyrmion phases induced by Rashba-Hund interactions in the kagome lattice

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