Skyrmion-Based Racetrack Memory With Continuous Loop Built From Ferromagnetic Metal and Insulator

Honda, Syuta; Yae, Takahiro; Ohsawa, Tomokatsu

doi:10.1109/tmag.2018.2866500

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…The sizes of the two skyrmions were controlled by the values of the DMI. The size of a skyrmion increased with increasing DMI value [50]. Also, the skyrmion size could be controlled by size of the wire as well as by the magnetic parameters.…”

Section: Discussionmentioning

confidence: 96%

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Kaiya¹,

Nishiyama²,

Honda³

et al. 2021

J. Phys. D: Appl. Phys.

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A magnetic skyrmion is stabilized via the Dzyaloshinskii–Moriya interaction in a perpendicularly magnetized thin nanowire. When the skyrmion is driven by a spin-transfer torque due to spin currents flowing through the wire, the skyrmion approaches the wire edge owing to the skyrmion Hall effect. In other words, the skyrmion moves obliquely along the longitudinal direction of the wire. The skyrmion often breaks or disappears because of this oblique motion. In this study, we propose an elliptical skyrmion to prevent this disappearance. We simulated the current-induced motion of an elliptical skyrmion produced in a wire through a micromagnetic approach. The elliptical skyrmion was also moved obliquely to the longitudinal direction of the wire. When a small current flowed through the wire, the skyrmion moved in the longitudinal direction of the wire after it approached the wire edge. When a larger current flowed through the wire, the skyrmion disappeared after it approached the wire edge. The elliptical skyrmion can be driven over a long distance with a larger current compared to a circular skyrmion. The motion of the skyrmion approaching the wire edge was analyzed using Thiele’s equation, with an external force. We estimated the external force from the simulation results of the skyrmion motion. The external force was proportional to the distance between the skyrmion edge and the wire edge. The results of this study indicate that using the elliptical skyrmion as a binary digit in a magnetic memory, such as a skyrmion-based racetrack memory, can be advantageous in term of the stability of the binary digit.

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Section: Discussionmentioning

confidence: 96%

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Kaiya¹,

Nishiyama²,

Honda³

et al. 2021

J. Phys. D: Appl. Phys.

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“…With an extensive study of the nucleation, dynamics, and detection of FM skyrmions, numerous devices such as racetrack memories, 12,13 transistors, 14 logic gates, 15 oscillators, 16 diodes, 17 neurons, 18 and synaptic devices 19 have been designed. Moreover, ferromagnetic (FM) skyrmion experiences.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic skyrmion-based high speed diode

2023

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“…However, it is difficult to send an electric current along the ring. 19,20) To control the skyrmion motion, we propose using an angelfish-type racetrack and an alternating current (AC) magnetic field [Fig. 1(a)].…”

mentioning

confidence: 99%

Controlling skyrmion motion in an angelfish-type racetrack memory by an AC magnetic field

Migita¹,

Yamada²,

Nakatani³

2020

Appl. Phys. Express

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We propose a method to control the skyrmion motion in an angelfish-type racetrack composed of triangular regions of reduced magnetic anisotropy using an alternating current (AC) magnetic field with nanosecond ordering. The method is verified in micromagnetic simulations from which we found that the maximum velocity of the skyrmion is 11 m s−1. Moreover, the direction the skyrmion moves can be reversed using the phase of the AC magnetic field. The results presented here offer a promising route to designing non-volatile memory and logic devices that utilize skyrmion motion.

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Skyrmion-Based Racetrack Memory With Continuous Loop Built From Ferromagnetic Metal and Insulator

Cited by 12 publications

References 10 publications

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Oblique drive tolerance of elliptical skyrmions moving in perpendicularly magnetized nanowire

Antiferromagnetic skyrmion-based high speed diode

Controlling skyrmion motion in an angelfish-type racetrack memory by an AC magnetic field

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