Dynamics of orbital skyrmions in a circular nanodisk

Feng, Youhua; Zhang, Xi; Xiang, Gang

doi:10.1039/d3cp00858d

Cited by 2 publications

(1 citation statement)

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“…Magnetic skyrmion, a topological magnetic structure characterized by a nanometric size and remarkable stability, has gained significant attention since its first experimental observation in 2009 [1][2][3]. Magnetic skyrmion can be used for various spintronic devices, including spin logic gates [4,5], transistor-like devices [6][7][8], spin diodes [9][10][11], spin-torque nano-oscillators [12][13][14], and racetrack memory devices [15,16]. In particular, racetrack memory devices based on a magnetic skyrmion offer the advantages of high storage density and low energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Elliptical Magnetic Skyrmion in Defective Racetrack

Zhu,

Xiang,

Feng

et al. 2024

Nanomaterials

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Recently, it has been reported that the skyrmion Hall effect can be suppressed in an elliptical skyrmion-based device. Given that defects are unavoidable in materials, it is necessary and important to investigate the dynamics of an elliptical skyrmion in a defective racetrack device. In this work, the current-driven dynamics of an elliptical skyrmion in a defective racetrack device are systematically studied using micromagnetic simulations. The system energy analysis reveals that the magnetic parameters of the circular defect play critical roles in determining the type (repulsive or attractive) and the magnitude of the force on the elliptical skyrmion. The simulated trajectories show that the primary motion modes of the elliptical skyrmion in the defective racetrack can be divided into four types, which are dependent on the values of the Dzyaloshinskii–Moriya interaction (DMI) constant Dd, the perpendicular magnetic anisotropy constant Kd, the magnitude of the driving current density J, and the size d of the defect. Further investigation of the motion-mode phases of the skyrmion reveals the synthetic effects of Dd, Kd, J, and d. Finally, the minimum depinning current density J, which linearly depends on the parameters of Dd and Kd, is obtained for a skyrmion completely pinned in the defect. Our findings give insights into the dynamics of an elliptical skyrmion in the presence of a defect with different magnetic parameters in a racetrack device and may be useful for performance enhancement of skyrmion-based racetrack memory devices.

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