Skyrmion propagation along curved racetracks

Carvalho-Santos, Vagson L.; Castro, M. A.; Salazar-Aravena, D.; Laroze, David; Corona, Rosa M.; Allende, S.; Altbir, D.

doi:10.1063/5.0045969

Cited by 25 publications

(5 citation statements)

References 53 publications

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“…In this context, because the torus curvature changes from negative to positive when one recurs its surface, emergent exchange-driven effective anisotropy and DMI [52] affect the shape of the observed PRM. Indeed, curvature-induced effective interactions are responsible for several changes in the magnetization properties in curved systems [72][73][74].…”

Section: Resultsmentioning

confidence: 99%

Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings

Corona¹,

Saavedra²,

Castillo-Sepúlveda³

et al. 2023

Nanotechnology

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Three dimensional magnetic textures are a cornerstone in magnetism researches. In this work, we analyze the stabilization and dynamic response of a magnetic hopfion hosted in a toroidal nanoring with intrinsic Dzialoshinskii-Moriya interaction simulating FeGe. Our results evidence that unlike their planar counterpart, where perpendicular magnetic anisotropies are necessary to stabilize hopfions, the shape anisotropy originated on the torus symmetry naturally yields the nucleation of these topological textures. We also analyze the magnetization dynamical response by applying a magnetic field pulse to differentiate among several magnetic patterns. Finally, to understand the nature of spin wave modes, we analyze the spatial distributions of the resonant mode amplitudes and phases and describe the differences among bulk and surface modes. Importantly, hopfions lying in toroidal nanorings present a non-circularly symmetric poloidal resonant mode, which is not observed in other systems hosting hopfions.

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Section: Resultsmentioning

confidence: 99%

Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings

Corona¹,

Saavedra²,

Castillo-Sepúlveda³

et al. 2023

Nanotechnology

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“…There is increasing interest in identifying ways to control individual and collective skyrmion motion. Possible methods include periodic pinning [21][22][23][24][25][26], ratchet effects [27][28][29][30][31][32], interface guided motion [33,34], strain, magnetic or temperature gradients [35][36][37][38], one-dimensional potential wells [39], curvature of the sample [40][41][42], and skyrmion-vortex coupling using a ferromagnet-superconductor heterostructure [43]. Skyrmions can also be manipulated by being compressed against a wall or linear obstacle, such as by applying a drive that forces the skyrmions to move toward an interface or extended nanostructure.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous skyrmion conformal lattice and transverse motion during dc and ac compression

et al. 2023

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We use atomistic-based simulations to investigate the behavior of ferromagnetic skyrmions being continuously compressed against a rigid wall under dc and ac drives. The compressed skyrmions can be annihilated close to the wall and form a conformal crystal with both a size and a density gradient, making it distinct from conformal crystals observed previously for superconducting vortices and colloidal particles. For both dc and ac driving, the skyrmions can move transverse to the compression direction due to a combination of density and size gradients. Forces in the compression direction are converted by the Magnus force into transverse motion. Under ac driving, the amount of skyrmion annihilation is reduced and we find a skyrmion Magnus ratchet pump. We also observe shear banding in which skyrmions near the wall move up to twice as fast as skyrmions further from the wall. When we vary the magnitude of the applied drive, we find a critical current above which the skyrmions are completely annihilated during a time scale that depends on the magnitude of the drive. By varying the magnetic parameters, we find that the transverse motion is strongly dependent on the skyrmion size. Smaller skyrmions are more rigid, which interferes with the size gradient and destroys the transverse motion. We also confirm the role of the size gradient by comparing our atomistic simulations with a particle-based model, where we find that the transverse motion is only transient. Our results are relevant for applications where skyrmions encounter repulsive magnetic walls, domain walls, or interfaces.

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“…It was shown that curvature-induced magnetochiral effects make these topological spin textures increase/decrease their stability when they are hosted on curved manifolds [28][29][30][31]. Additionally, the geometry of a magnetic nanofilm can also influence the skyrmion shape [32] and their dynamics, which can be affected by curvature-induced forces [33][34][35]. Finally, it was also shown that, depending on the geometrical parameters of systems with azimuthal symmetry, skyrmions could be stabilized on cylindrical [36] or truncated conical [37] nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Bimerons in Cylindrical Nanotubes

Galvez,

Castro,

Bittencourt

et al. 2023

Nanomaterials

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This work presents the analysis of the stability of magnetic bimerons in a cylindrical nanotube. Through micromagnetic simulations, we study the influence of magnetic and geometrical parameters on the bimeron existence and size. The obtained results allow us to present diagram states showing the stability region of a bimeron as a function of the nanotube’s height and radius for different anisotropy and Dzyaloshinskii–Moriya interaction strengths. We also obtain two other magnetic states in the range of parameters where the bimeron is not stable: helicoidal and saturated states.

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Skyrmion propagation along curved racetracks

Cited by 25 publications

References 53 publications

Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings

Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings

Spontaneous skyrmion conformal lattice and transverse motion during dc and ac compression

Magnetic Bimerons in Cylindrical Nanotubes

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