Current-induced dynamics of skyrmion tubes in synthetic antiferromagnetic multilayers

Xia, Jingbo; Zhang, Xichao; Mak, K. Y.; Ezawa, Motohiko; Tretiakov, Oleg A.; Zhou, Yan; Zhao, Guoping; Liu, Xiaoxi

doi:10.1103/physrevb.103.174408

Cited by 21 publications

(10 citation statements)

References 79 publications

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“…is the damping-like spin-orbit-torque coefficient with h as the reduced Planck constant, e is the electron charge, j is the applied driving current density, θ SH = 0.1 is the spin Hall angle, a is the film thickness of FM layer. For the total Hamiltonian H total , we consider the Hamiltonian of each FM layer H n and the interlayer AFM exchange coupling H inter between the top and bottom FM layers, [42,59] which can be written as…”

Section: Model and Methodsmentioning

confidence: 99%

Skyrmion-based logic gates controlled by electric currents in synthetic antiferromagnet

Li¹,

Luo²,

Xia³

et al. 2023

Chinese Phys. B

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Skyrmions in synthetic antiferromagnetic (SAF) systems have attracted much attention in recent years due to their superior stability, high-speed mobility and completely compensated skyrmion Hall effect. They are promising building blocks for the next generation of magnetic storage and computing devices with ultra-low energy and ultra-high density. Here, we theoretically investigate the motion of a skyrmion in a SAF bilayer racetrack and find the velocity of a skyrmion can be controlled jointly by the edge effect and the driving force induced by the spin current. Furthermore, we propose a logic gate that can realize different logic functions of logic AND, OR, NOT, NAND, NOR and XOR gates. Several effects including the spin-orbit torque, the skyrmion Hall effect, skyrmion-skyrmion repulsion and skyrmion-edge interaction are considered in this design. Our work may provide a way to utilize the SAF skyrmion as a versatile information carrier for future energy-efficient logic gates.

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Section: Model and Methodsmentioning

confidence: 99%

Skyrmion-based logic gates controlled by electric currents in synthetic antiferromagnet

Li¹,

Luo²,

Xia³

et al. 2023

Chinese Phys. B

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“…[ 1,3,11–13 ] However, a ferromagnetic skyrmion driven by the current may show the so‐called “skyrmion Hall effect” (SkHE), [ 14–19 ] which usually leads to the transverse motion of the skyrmion relative to the current direction and poses a serious obstacle to their practical applications. Researchers have proposed a variety of possible theoretical solutions to suppress the SkHE, including using synthetic antiferromagnetic (SAF) skyrmions, [ 20–29 ] compensated ferrimagnetic skyrmions, [ 30–33 ] and skyrmioniums. [ 34–37 ] The SAF skyrmions, with two ferromagnetic skyrmions antiferromagnetically exchange‐coupled, have also been predicted to show zero SkHE as they have zero topological winding number, that is, Q s = 0.…”

Section: Introductionmentioning

confidence: 99%

Identifying and Exploring Synthetic Antiferromagnetic Skyrmions

Yang

et al. 2023

Adv Funct Materials

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Synthetic antiferromagnetic (SAF) skyrmions are emerging as novel information carriers due to their high mobility and lack of a skyrmion Hall effect. However, distinguishing SAF skyrmions from their ferromagnetic counterparts using imaging techniques like magneto‐optical microscopy remains challenging. While the suppressed intrinsic skyrmion Hall effect (SkHE) has been commonly used to identify SAF skyrmions, it is important to note that other factors such as defect pinning and dipolar interaction can also lead to a suppressed SkHE. Therefore, there is an urgent need for a universal identification method that can reliably differentiate SAF skyrmions from ferromagnetic ones. In this study, the generation of a SAF skyrmion within a standard SAF stack is demonstrated and its motion with almost no SkHE is investigated. Furthermore, a universal identification method is proposed wherein the application of an out‐of‐plane field allows the SAF skyrmion to be decoupled into two domains, which can either expand or contract with the application of an electric current. By expediting the development of a reliable means of identifying SAF skyrmions, these findings will accelerate the realization of practical applications based on these unique information carriers.

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“…This effect has hindered the use of skyrmions in practical applications. As remedies, researchers have offered several potential solutions, including synthetic antiferromagnet skyrmions [18][19][20] , compensated ferrimagnetic skyrmions [21][22][23][24] , and skyrmioniums [25][26][27][28][29][30][31][32][33][34] .…”

Section: Introductionmentioning

confidence: 99%

Reversible conversions between skyrmions and skyrmioniums

Yang

Chu

et al. 2022

Preprint

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Skyrmions and skyrmioniums are both topological non-trivial spin textures in chiral magnetic systems. The dynamics of these particle-like excitations can be distinguished according to their spin structures, and the controlled conversion between them is the key to the diversified functionalities of spintronic devices. In this study, the dynamics and evolution of chiral spin textures are investigated in [Pt/Co]3/Ru/[Co/Pt]3 multilayers with ferromagnetic interlayer exchange coupling. Reversible conversions between skyrmions and skyrmioniums can be realized by precisely controlling the domain wall through an applied magnetic field or electric current. Mediated by a multi-Q (winding number or topological number) cluster, skyrmions can be converted to skyrmioniums through two basic mechanisms. One way is to expand skyrmions by using sinusoidal pulses to form net domains, then to delete the stripe domains of the net domain to create the skyrmionium (reduce Q to zero). The second way is to drive multi-Q clusters to move and collapse into skyrmioniums with square pulses. The skyrmion Hall effect of skyrmioniums has been suppressed to zero, which supports that the winding number of skyrmioniums indeed is reduced to zero. We have also directly observed the topological conversion of a skyrmionium into skyrmion, characterized by the abrupt emergence of the skyrmion Hall effect. The establishment of reversible conversions between different magnetic topological spin textures is an important development, which should speed the advent of the next generation of spintronic device.

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Current-induced dynamics of skyrmion tubes in synthetic antiferromagnetic multilayers

Cited by 21 publications

References 79 publications

Skyrmion-based logic gates controlled by electric currents in synthetic antiferromagnet

Skyrmion-based logic gates controlled by electric currents in synthetic antiferromagnet

Identifying and Exploring Synthetic Antiferromagnetic Skyrmions

Reversible conversions between skyrmions and skyrmioniums

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