Clogging, diode and collective effects of skyrmions in funnel geometries

Souza, J. C. Bellizotti; Vizarim, N. P.; Reichhardt, C.; Venegas, P. A.

doi:10.1088/1367-2630/ac9749

Cited by 17 publications

(5 citation statements)

References 65 publications

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“…This even causes the reverse moving skyrmion to be annihilated at the racetrack boundary, thus achieving the function of skyrmion diodes. It should be noted that the presence of SkHE is critical, as the diode behavior induced by the ratchet effect caused by SkHE will fail in an overdamped system [41,42]. Moreover, we report the current-driven dynamics of the skyrmion in a ferromagnetic racetrack with VCMA.…”

Section: Introductionmentioning

confidence: 81%

A magnetic skyrmion diode based on potential well inducting effect

Chen

et al. 2023

J. Phys.: Condens. Matter

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Magnetic skyrmions have great potential in the application of spintronic devices due to their stable topologically protected spin configuration. To meet the needs of spintronic device design, it is necessary to manipulate the movement of the magnetic skyrmions. Here we propose a skyrmion diode based on potential well induced skyrmion motion through theoretical calculations. The potential well is generated by the voltage-controlled magnetic anisotropy (VCMA) gradient. By utilizing the induction of the potential well as well as the skyrmion Hall effect (SkHE), the velocity and trajectory of the skyrmions can be controlled and the forward pass and reverse cutoff functions of diode-like devices have been realized. Furthermore, we report the dynamics of current-driven skyrmions in a racetrack with locally applied VCMA. Under the influence of the SkHE, the difference in dynamic behavior between forward and reverse motion of the skyrmions is obvious, and the potential well can produce different pinning, depinning and annihilating effects on forward and reverse moving skyrmions. O ur results can be beneficial for the design and development of magnetic skyrmion diodes.

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Section: Introductionmentioning

confidence: 81%

A magnetic skyrmion diode based on potential well inducting effect

Chen

et al. 2023

J. Phys.: Condens. Matter

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“…In the hypothetical case of a skyrmion with no Magnus force, α m /α d = 0, similar behavior appears but the magnitude of the velocity is diminished. The mechanism of the skyrmion sliding along repulsive walls due to the Magnus force was explained recently in [47]. In figure 3 we plot selected skyrmion trajectories for the system in figure 2…”

Section: Easy Direction (−X) Drivingmentioning

confidence: 96%

Magnus induced diode effect for skyrmions in channels with periodic potentials

Souza

Vizarim

Reichhardt

et al. 2022

J. Phys.: Condens. Matter

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Using a particle based model, we investigate the skyrmion dynamical behavior in a channel where the upper wall contains divots of one depth and the lower wall contains divots of a different depth. Under an applied driving force, skyrmions in the channels move with a finite skyrmion Hall angle that deflects them toward the upper wall for $-x$ direction driving and the lower wall for $+x$ direction driving. When the upper divots have zero height, the skyrmions are deflected against the flat upper wall for $-x$ direction driving and the skyrmion velocity depends linearly on the drive. For $+x$ direction driving, the skyrmions are pushed against the lower divots and become trapped, giving reduced velocities and a nonlinear velocity-force response. When there are shallow divots on the upper wall and deep divots on the lower wall, skyrmions get trapped for both driving directions; however, due to the divot depth difference, skyrmions move more easily under $-x$ direction driving, and become strongly trapped for $+x$ direction driving. The preferred $-x$ direction motion produces what we call a Magnus diode effect since it vanishes in the limit of zero Magnus force, unlike the diode effects observed for asymmetric sawtooth potentials. We show that the transport curves can exhibit a series of jumps or dips, negative differential conductivity, and reentrant pinning due to collective trapping events. We also discuss how our results relate to recent continuum modeling on a similar skyrmion diode system.

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“…Magnetic skyrmion, 1–3 a particle-like spin structure usually stabilized by Dzyaloshinskii–Moriya (DM) interaction, 4,5 has attracted much interest because of its rich physics 6–8 and possible implementations in various devices such as skyrmion diodes, 9,10 skyrmion ratchets, 11 racetrack memories, 12 logic gates, 13–16 and nano-oscillators. 17–28 Among them, nano-oscillators based on skyrmions in circular nanodisks have been heavily studied because their high-frequency motion can be easily used for microwave generators and/or detectors.…”

Section: Introductionmentioning

confidence: 99%