Tuning the Skyrmion Hall Effect via Engineering of Spin-Orbit Interaction

Akosa, Collins Ashu; Li, Hang; Tatara, Gen; Tretiakov, Oleg A.

doi:10.1103/physrevapplied.12.054032

Cited by 18 publications

(16 citation statements)

References 63 publications

(49 reference statements)

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“…However, due to their transverse motion arising from the skyrmion-Hall effect, they soon arrive at the boundary of the channel and their spin-textures get destroyed [40]. Several experimental [15,41] attempts and theoretical [42] proposals have been made for holding their longitudinal motions only. We here propose an experimental setup (Fig.…”

mentioning

confidence: 99%

Length-scale independent skyrmion and meron Hall angles

Bera¹,

Mandal²

2020

J. Phys.: Condens. Matter

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Motivated by the recent observation (Zeissler et al 2020 Nature Commun. 11 428) of enigmatic radius-independent skyrmion Hall angle in chiral magnets, we derive skyrmion Hall angle based on the recent solution of skyrmions characterized by the sole length scale determined with the Dzyaloshinskii–Moriya interaction strength and applied magnetic field. We find that the skyrmion Hall angle is independent of input current density and the length-scale which determines the radius of a skyrmion. This is corroborated with the single length-scale dependent skyrmion profile which is the solution of the Euler equation of polar angle representing magnetization. Although the magnitude of Hall angle may change with the change of profile (shape) of the skyrmion, it remains unchanged for a particular profile. With the application of tunable current along mutually perpendicular directions, this property enables us to propose an experimental setup by which the transverse motion of a skyrmion can be restricted so that the skyrmion can only traverse longitudinally. We further find the length-scale and input-current density independent Hall angles for merons where their transverse motion will be opposite depending on whether the spin at their centers are up or down, in agreement with an experiment.

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confidence: 99%

Length-scale independent skyrmion and meron Hall angles

Bera¹,

Mandal²

2020

J. Phys.: Condens. Matter

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“…Owing to the non-trivial nature of the spin structures, a traversing electron experiences a continuous precession of its spin magnetic moment, equivalent to a virtual (or emergent) magnetic field. Conventionally, the effect of this emergent field manifests as an additional contribution to Hall resistivity and serves as an electrical signature of the existence of topological spin textures, commonly referred to as topological Hall effect (THE) 27 , 38 – 42 . On the other hand, the possibility of utilization of centrosymmetric FMs as topological spin texture hosting materials was completely neglected owing to symmetry requirements, which dictates the absence of DMI in these systems.…”

Section: Resultsmentioning

confidence: 99%

Unconventional Hall effect and its variation with Co-doping in van der Waals Fe3GeTe2

Chowdhury

DuttaGupta

Patra

et al. 2021

Sci Rep

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Two-dimensional (2D) van der Waals (vdW) magnetic materials have attracted a lot of attention owing to the stabilization of long range magnetic order down to atomic dimensions, and the prospect of novel spintronic devices with unique functionalities. The clarification of the magnetoresistive properties and its correlation to the underlying magnetic configurations is essential for 2D vdW-based spintronic devices. Here, the effect of Co-doping on the magnetic and magnetotransport properties of Fe3GeTe2 have been investigated. Magnetotransport measurements reveal an unusual Hall effect behavior whose strength was considerably modified by Co-doping and attributed to arise from the underlying complicated spin textures. The present results provide a clue to tailoring of the underlying interactions necessary for the realization of a variety of unconventional spin textures for 2D vdW FM-based spintronics.

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“…Furthermore, accounting for a mixed spin-orbital electron dynamics becomes especially important when one reduces the skyrmion size and thus inevitably enters into the clean limit of a ballistic electron motion inside the skyrmion. One common approach capable for analyzing these issues is based on the tight-binding model, there are various simulations of THE for individual magnetic textures [34][35][36][37][38] and skyrmion latices [39][40][41]. However, as an alternative and somewhat more flexible description one has recently appealed to the scattering theory [42,43].…”

Section: Introductionmentioning

confidence: 99%

Theory of an electron asymmetric scattering on skyrmion textures in two-dimensional systems

Denisov

2020

Preprint

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We discuss in details the electron scattering pattern on skyrmion-like magnetic textures in twodimensional geometry. The special attention is focused on analyzing the scattering asymmetry, which is a precursor of the topological Hall effect. We present analytical results valid for the limiting regimes of strong and weak coupling, we also describe the numerical scheme that gives access to the exact solution of the scattering problem. Based on the numerical computations we investigate the properties of the asymmetric scattering for an arbitrary magnitude of the interaction strength and the topology of a magnetic texture. We analyze in details the conditions when the topological charge of a magnetic texture is indeed essential for the appearance of the Hall response.We also describe how the electron scattering asymmetry is modified due to an additional shortrange impurity located inside a magnetic skyrmion.

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Tuning the Skyrmion Hall Effect via Engineering of Spin-Orbit Interaction

Cited by 18 publications

References 63 publications

Length-scale independent skyrmion and meron Hall angles

Length-scale independent skyrmion and meron Hall angles

Unconventional Hall effect and its variation with Co-doping in van der Waals Fe3GeTe2

Theory of an electron asymmetric scattering on skyrmion textures in two-dimensional systems

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