Robust formation of skyrmion and skyrmionium in magnetic hemispherical shells and their dynamic switching

Yang, Jaehak; Park, Hyeon-Kyu; Park, Gyuyoung; Abert, Claas; Suess, Dieter; Kim, Sang‐Koog

doi:10.1103/physrevb.104.134427

Cited by 5 publications

(4 citation statements)

References 70 publications

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“…Due to the confinement effect, 3D magnetic structures are more likely to exist in geometrically confined structures. For example, in a hemispherical-shell shape, Yang et al [104,105] explored the variations of the magnetic structures of vortices, skyrmions, and skyrmioniums, and found a switching behavior of skyrmion polarity through a transient skyrmionium state using very-low-strength magnetic field pluses. Also in a geometrically confined structure, a nanocylinder, a skyrmion tube was proven [86] to be able to transform into similar magnetic structures such as toron and hopfion, by attaching interfaces with PMA at both ends of the nanocylinder, as shown in figure 5(b).…”

Section: Transformation To Other Structuresmentioning

confidence: 99%

Micromagnetic manipulation and spin excitation of skyrmionic structures

Bo¹,

Hu²,

Zhao³

et al. 2022

J. Phys. D: Appl. Phys.

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Magnetic skyrmions have attracted enormous research interest across a wide range of fields, from condensed matter physics to material science, since the first observation in 2009. Abundant theoretical, computational, and experimental studies have contributed to this emerging interdiscipline: skyrmionics. Especially, great expectations have been placed on exploiting the physics and dynamics of magnetic skyrmions as potential information carriers. In this topical review, we particularly focus on the computational studies of skyrmions during the last decade. After briefly introducing the mechanism of micromagnetic simulations, we review and discuss the manipulation of skyrmions, i. e., their creation, transformation, motion, and spin excitation, by both traditional and advanced methods, including electric currents, magnetic fields, spin waves, microwaves, etc. We take magnetic skyrmion as a typical example, while other skyrmion-related magnetic structures such as skyrmioniums and skyrmion tubes are also slightly involved. Through this review, we hope to give some insights into the further development of magnetic skyrmions in spintronics.

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Section: Transformation To Other Structuresmentioning

confidence: 99%

Micromagnetic manipulation and spin excitation of skyrmionic structures

Bo¹,

Hu²,

Zhao³

et al. 2022

J. Phys. D: Appl. Phys.

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“…30,31,35 These possibilities encompass adjustments in magnetic ordering and spin conőgurations and the generation of new magnetic textures and topological characteristics. 36 A recent work 37 conducted micromagnetic simulations to demonstrate the stabi-lization of various magnetic textures caused by the curvature of isolated magnetic spherical half-shells. This study documented the emergence of vortex, monodomain, skyrmions, and even skyrmionium states by varying magnetic anisotropies.…”

mentioning

confidence: 99%

“…Notably, the magnetic proőle (Figure 4d) closely resembles what would be expected for a skyrmion (as referenced ref. 37,45 ). We present a topographic image of the same region to underscore that the observed contrasts are unrelated to the topography.…”

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confidence: 99%

Curved Nanomagnets: An Experimental Archetype for Skyrmion Stabilization

Dugato,

Jalil,

Cardias

et al. 2024

Preprint

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In the fields of nanomagnetism and spintronics, the controlled stabilization of mag- netic skyrmions is a topic of great interest for potential applications in data storage and innovative computing systems. This study delves into the intriguing phenomenon of skyrmions on a hexagonal array of curved nanomagnets. Through a combination of atomistic calculation, micromagnetic simulations, and experimental observations, we thoroughly explore the intricate interplay between magnetic parameters, curvature, and interfacial Dzyaloshinskii-Moriya interaction (iDMI) in the formation of these topolog- ically non-trivial magnetic structures. We have observed the spontaneous formation of isolated skyrmions (<150 nm) on a curved nanomagnet matrix of symmetric Pt/Co/Pt multilayer without the necessity of applied fields. Our research sheds light on the pro- found impact of geometric curvature on iDMI, offering invaluable insights for engi- neering and controlling skyrmionic configurations. This work advances nanomagnetism knowledge and sets the stage for designing skyrmion-based technologies.

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“…Skyrmion domains can become punctured, thereby leading to the formation of concentric skyrmions with opposite topological charges upon unloading of the pressure. The combination of the two oppositely charged skyrmions form a topological composite called skyrmionium, which has been investigated in magnetic materials for next generation spintronics based devices ,− but not in ferroelectric materials. To the best of our knowledge, this is the first demonstration of skyrmion-to-skyrmionium “reaction” in ferroelectric materials.…”

mentioning

confidence: 99%

Squishing Skyrmions: Symmetry-Guided Dynamic Transformation of Polar Topologies Under Compression

Linker

Nomura

Fukushima

et al. 2022

J. Phys. Chem. Lett.

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Mechanical controllability of recently discovered topological defects (e.g., skyrmions) in ferroelectric materials is of interest for the development of ultralow-power mechano-electronics that are protected against thermal noise. However, fundamental understanding is hindered by the “multiscale quantum challenge” to describe topological switching encompassing large spatiotemporal scales with quantum mechanical accuracy. Here, we overcome this challenge by developing a machine-learning-based multiscale simulation frameworka hybrid neural network quantum molecular dynamics (NNQMD) and molecular mechanics (MM) method. For nanostructures composed of SrTiO3 and PbTiO3, we find how the symmetry of mechanical loading essentially controls polar topological switching. We find under symmetry-breaking uniaxial compression a squishing-to-annihilation pathway versus formation of a topological composite named skyrmionium under symmetry-preserving isotropic compression. The distinct pathways are explained in terms of the underlying materials’ elasticity and symmetry, as well as the Landau–Lifshitz–Kittel scaling law. Such rational control of ferroelectric topologies will likely facilitate exploration of the rich ferroelectric “topotronics” design space.

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Robust formation of skyrmion and skyrmionium in magnetic hemispherical shells and their dynamic switching

Cited by 5 publications

References 70 publications

Micromagnetic manipulation and spin excitation of skyrmionic structures

Micromagnetic manipulation and spin excitation of skyrmionic structures

Curved Nanomagnets: An Experimental Archetype for Skyrmion Stabilization

Squishing Skyrmions: Symmetry-Guided Dynamic Transformation of Polar Topologies Under Compression

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