Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Kaiya, Yuki; Nishiyama, Shota; Honda, Syuta; Itoh, H.; Ohsawa, Tomokatsu

doi:10.1088/1361-6463/ac3454

Cited by 5 publications

(2 citation statements)

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“…However, the trigger skyrmions slightly approached the wire edge because the trigger skyrmions were packed in the wire. Further, they moved along the longitudinal direction of the wire [6,[59][60][61]. The data skyrmions also moved along with the trigger skyrmions.…”

Section: Discussionmentioning

confidence: 88%

Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions

Kato¹,

Ohsawa²,

Honda³

2022

J. Phys. D: Appl. Phys.

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Magnetic-skyrmion-based racetrack memory is a high-density memory for storing information driven by low-power, wherein the arrangement of skyrmions is stored in the form of binary digit combinations. This arrangement is altered based on the skyrmion motion resulting from the influence of the spin-transfer torque. We propose a novel layered structure of a ferromagnetic metal (FM) wire/nonmagnetic insulator wire/FM wire in which the skyrmions move while maintaining the arrangement. It consists of two FM wires that are perpendicularly magnetized. One of these comprises several skyrmions, which act as binary digits (data skyrmions). The other wire constitutes a sufficient number of skyrmions that are closely packed and allow the spin-polarized current to flow. A dipole–dipole interaction acts between these two FM wires. The motion of the data skyrmion is induced by the current-induced motion of the packed skyrmion. The motion of skyrmions is simulated via micromagnetic approaches. The data skyrmions move while maintaining the distance between each skyrmion. The analog position of the data skyrmion is controlled by the current flowing through another wire. The stable data skyrmion motion has a threshold current. When the current is larger than the threshold current, the skyrmion breaks, and/or the distance between skyrmions breaks. The threshold current density is found to decrease with an increasing vacuum layer thickness and increase with increasing thickness of the FM wire flowing current. Our results show that the skyrmion motion in the proposed structure can drive skyrmions with a spin-current density lower than that of the coupled granular/continuous structure and the edge-notched nanowire structure. This structure can be used in developing low-power operational devices based on skyrmion motion.

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Section: Discussionmentioning

confidence: 88%

Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions

Kato¹,

Ohsawa²,

Honda³

2022

J. Phys. D: Appl. Phys.

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“…Notably, owing to its unconventional shape anisotropy [25][26][27], it has been reported that an elliptical skyrmion can also suppress the skyrmion Hall effect. Simulations have shown that the dynamics of an elliptical skyrmion differs significantly from that of a circular skyrmion [28], as an elliptical skyrmion can move along a track without transverse motion [29]. Interestingly, although the influence of defects on the motion of a circular skyrmion has been extensively studied [30,31], the impact of defects on the current-driven motion of an elliptical skyrmion has not been reported.…”

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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Elliptical spin textures in two-dimensional semimetals with spatially anisotropic Dzyaloshinskii-Moriya interaction

Luo,

Liu,

Nian

et al. 2024

Phys. Rev. B

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Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Cited by 5 publications

References 50 publications

Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions

Design of a novel bilayered structure of ferromagnetic metal and nonmagnetic insulator wires while maintaining the distance between the constituent skyrmions

Dynamics of Elliptical Magnetic Skyrmion in Defective Racetrack

Elliptical spin textures in two-dimensional semimetals with spatially anisotropic Dzyaloshinskii-Moriya interaction

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