Skyrmion core size dependence as a function of the perpendicular anisotropy and radius in magnetic nanodots

Castro, M. A.; Allende, S.

doi:10.1016/j.jmmm.2016.05.095

Cited by 22 publications

(22 citation statements)

References 17 publications

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“…We define the skyrmion size R as the radius of the m z = 0 contour. The wall width w is another fundamental skyrmion quantity often ignored or not treated properly in previous studies [25][26][27][28] . One can also define the skyrmion polarity as p = [m z (r = ∞) − m z (r = 0)]/2 so that p = 1 (− 1) corresponds to spins in the core and outer domain pointing respectively to the − z(+ z) and + z(− z) directions.…”

Section: Resultsmentioning

confidence: 99%

“…Although much knowledge about the DMI-supported magnetic skyrmions has been accumulated after intensive studies including skyrmion generation 10,13,21,22 and manipulation 18,23,24 , the dependence of skyrmion size (R) on material parameters such as exchange energy, magnetic anisotropy energy, and DMI strength is still poorly understood at a quantitative, or even qualitative level 18,[25][26][27][28][29] . Even worse, the physical pictures behind most previous studies are not clear.…”

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confidence: 99%

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A theory on skyrmion size

2018

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A magnetic skyrmion is a topological object consisting of a skyrmion core, an outer domain, and a wall that separates the skyrmion core from the outer domain. The skyrmion size and wall width are two fundamental quantities of a skyrmion that depend sensitively on material parameters such as exchange energy, magnetic anisotropy, Dzyaloshinskii-Moriya interaction, and magnetic field. However, quantitative understanding of the two quantities is still very poor. Here we present a general theory on skyrmion size and wall width. The two formulas we obtained agree almost perfectly with simulations and experiments for a wide range of parameters, including most of the existing materials that support skyrmions.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

A theory on skyrmion size

2018

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“…, the skyrmion triangular lattices in bulk ferromagnets and infinite films were intensively investigated . It was shown that lateral confinement modifies the conditions for the skyrmion stability significantly in ultrathin films, as well as in the case of the B20 compounds …”

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confidence: 99%

Bi‐Stability of Magnetic Skyrmions in Ultrathin Multilayer Nanodots Induced by Magnetostatic Interaction

Zelent

Tóbik

Krawczyk

et al. 2017

Physica Rapid Research Ltrs

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We report the results of simulations of magnetic skyrmion stability in ultrathin magnetic multilayer nanodots with interfacial Dzyaloshinskii-Moriya exchange interaction (DMI). We found that in presence of the lateral confinement the magnetostatic energy significantly influences the skyrmion stability and leads to stabilization of large radius skyrmion even at low values of the DMI strength, in addition to small radius skyrmion stabilized by DMI. In particular, stabilization of the skyrmion state with two different radii (bi-stability) is found in dipolarly-coupled (Pt/Co/Ir)n circular nanodots with the number of repeats of the unit cell n = 3 and 5. The bi-stability range is located at the DMI strength of 0.9-1.1 mJ/m 2 or at the total Co-layer thickness of 2.2-2.6 nm.

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“…where M s is the saturation magnetization of the dot, and m 2 φ (ρ) + m 2 z (ρ) = 1. Then, the analytical and numerical calculations are done by parameterizing the magnetization function for the bubble skyrmion in cylindrical coordinates by 12,21…”

Section: Horizontal Separation Between Two Magnetic Disks With Low Anmentioning

confidence: 99%

“…The Néel and Boch skyrmion configurations can be obtained by introducing a Dzyaloshinskii-Moriya interaction due to the strong spin-orbit coupling between two materials 1,2,4,7 . Similarly, the bubble skyrmions can be stabilized through an uniaxial magnetic anisotropy perpendicular to the plane of the disk [8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Magnetostatic interaction between two bubble skyrmions

Castro

Mancilla-Almonacid

Valdivia

et al. 2020

J. Phys.: Condens. Matter

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A detailed analytic and numerical analysis of the interaction between two bubble skyrmions has been carried out. Results from micromagnetic calculations show a strong dependence of the parameters of the skyrmion magnetic profile as a function of the magnetostatic interaction. The magnetic core and edge-width sizes of the skyrmion increase or decrease depending on the relative position between the skyrmions and the uniaxial perpendicular anisotropy. In particular, when a magnetic disk is over another, there is a transition from a Bloch-like skyrmion configuration to a Néel-like skyrmion configuration as the distance between the disks decreases, as a consequence of the magnetostatic interaction. Therefore, it is possible to stabilize a bubble skyrmion with a Néel configuration without the Dzyaloshinskii-Moriya interaction. Thus, these results can be used for the parameters control of the skyrmions in magnetic spintronic devices that need to use these configurations. 2/1311/13

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Skyrmion core size dependence as a function of the perpendicular anisotropy and radius in magnetic nanodots

Cited by 22 publications

References 17 publications

A theory on skyrmion size

A theory on skyrmion size

Bi‐Stability of Magnetic Skyrmions in Ultrathin Multilayer Nanodots Induced by Magnetostatic Interaction

Magnetostatic interaction between two bubble skyrmions

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