Three layers of skyrmions in the magnetic triple-layer structure without the Dzyaloshinsky-Moriya interaction

Xie, Kaixuan; Sang, H.

doi:10.1063/1.4903548

Cited by 9 publications

(5 citation statements)

References 41 publications

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“…The first idea is to place Co particles with vortex distribution of the magnetization on the surface of the CoPt film with the perpendicular anisotropy. It was demonstrated by numerical micromagnetic simulations 14,15 followed by experimental investigation [16][17][18] that in this case the skyrmions can be stabilized in the CoPt film due to the exchange interaction with the magnetic vortex. The investigated artificial skyrmion lattices have the average topological charge densities (i.e., the number of skyrmions per square micron) up to 4 lm À2 in the better case.…”

mentioning

confidence: 99%

Artificial dense lattice of magnetic bubbles

Сапожников

Вдовичев

Ermolaeva

et al. 2016

Applied Physics Letters

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Co/Pt multilayers with perpendicular magnetic anisotropy are irradiated by focused He+ ion beam to locally reduce the anisotropy value. The irradiated spots with a diameter of 100 nm are arranged in a square lattice with 200 nm period. The formation of the nonuniform periodic magnetic structure is observed without changes in the film topography. The spatial symmetry of the magnetic force microscopy signal and the specific shape of magnetization curves indicate the formation of the magnetic bubbles or magnetic vortices within the irradiated spot depending on the irradiation dose. The experimental data are in a good agreement with micromagnetic simulations of the system.

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mentioning

confidence: 99%

Artificial dense lattice of magnetic bubbles

Сапожников

Вдовичев

Ermolaeva

et al. 2016

Applied Physics Letters

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“…6 and 7(b)). Zero-DMI skyrmions have been previously reported in the literature 15,[32][33][34] . In ref.…”

Section: Currents -Phase Diagramsmentioning

confidence: 88%

“…In ref. 34 , the skyrmion ground state resulted from a complex interplay of anisotropy, exchange and magnetostatic interactions specific to the Co/Ru/Co multilayers studied, while in 32 , the authors were able to observe, using photoelectron emission microscopy (PEEM), a HG skyrmion in a Co/Pt disk at room temperature within a narrow range of anisotropy values. In 15,33 , magnetostatic coupling to overlying nanostructures is exploited to stabilized the skyrmion.…”

Section: Currents -Phase Diagramsmentioning

confidence: 99%

Micromagnetic study of skyrmion stability in confined magnetic structures with perpendicular anisotropy

Novak

García

Novais

et al. 2018

Journal of Magnetism and Magnetic Materials

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Skyrmions are emerging topological spin structures that are potentially revolutionary for future data storage and spintronics applications. The existence and stability of skyrmions in magnetic materials is usually associated to the presence of the Dzyaloshinskii-Moriya interaction (DMI) in bulk magnets or in magnetic thin films lacking inversion symmetry. While some methods have already been proposed to generate isolated skyrmions in thin films with DMI, a thorough study of the conditions under which the skyrmions will remain stable in order to be manipulated in an integrated spintronic device are still an open problem. The stability of such structures is believed to be a result of ideal combinations of perpendicular magnetic anisotropy (PMA), DMI and the interplay between geometry and magnetostatics. In the present work we show some micromagnetic results supporting previous experimental observations of magnetic skyrmions in spin-valve stacks with a wide range of DMI values. Using micromagnetic simulations of cobalt-based disks, we obtain the magnetic ground state configuration for several values of PMA, DMI and geometric parameters. Skyrmion numbers, corresponding to the topological charge, are calculated in all cases and confirm the occurrence of isolated, stable, axially symmetric skyrmions for several combinations of DMI and anisotropy constant. The stability of the skyrmions in disks is then investigated under magnetic field and spin-polarized current, in finite temperature, highlighting the limits of applicability of these spin textures in spintronic devices.

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“…The constructure of nanotubes was assumed to be a rolled Co/Pt multilayer film, and the material parameters were as follows [43][44][45][46]: saturation magnetization M sat = 580 kA/m, exchange stiffness constant A ex = 15 PJ/m, easy-normal anisotropy parameter K u = 800 kJ/m 3 , damping constant α = 0.1 and the interfacial DMI constant D DMI = 2.3 mJ/m 2 . For spin-polarized current, electrical current polarization P = 0.5 and nonadiabaticity of spintransfer torque β = 0.5.…”

Section: Methodsmentioning

confidence: 99%

Asymmetric Motion of Magnetic Skyrmions in Ferromagnetic Nanotubes Induced by a Magnetic Field

2022

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Magnetic skyrmions, featuring topological stability and low driving current density, are believed to be a promising candidate of information carriers. One of the obstacles to application is the skyrmion Hall effect, which can lead to the annihilation of moving skyrmions at the lateral boundary of thin-film tracks. In order to resolve this issue, it was recently proposed to exploit ferromagnetic nanotubes as alternative skyrmion guides. In this work, we investigate the field-effect of current-driven skyrmion motion in nanotubes using micromagnetic simulations. It is found that, in the presence of an axial field, the skyrmion motion becomes asymmetric in tubes. This is fundamentally different from the flat strip, in which a field has little influence on the skyrmion dynamics. Based on the dissipation tensor determined by the spin texture of the skyrmions, the solution of the Thiele equation is obtained, yielding a perfect match with simulations. We argue that the asymmetry of the skyrmion dynamics originates from the curvature of the nanotube.

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Three layers of skyrmions in the magnetic triple-layer structure without the Dzyaloshinsky-Moriya interaction

Cited by 9 publications

References 41 publications

Artificial dense lattice of magnetic bubbles

Artificial dense lattice of magnetic bubbles

Micromagnetic study of skyrmion stability in confined magnetic structures with perpendicular anisotropy

Asymmetric Motion of Magnetic Skyrmions in Ferromagnetic Nanotubes Induced by a Magnetic Field

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