Dynamics of antiskyrmions induced by the voltage-controlled magnetic anisotropy gradient

Qiu, Lei; Xia, Jingbo; Feng, Youhua; Shen, Laichuan; Morvan, F. J.; Zhang, Xichao; Liu, Xiaoxi; Xie, Lin‐Hua; Zhou, Yan; Zhao, Guoping

doi:10.1016/j.jmmm.2019.165922

Cited by 17 publications

(9 citation statements)

References 60 publications

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“…The skyrmions can be driven by an electric current either via the spin-transfer torque (STT) 21,22 or the spin orbit torque (SOT). 23,24 The skyrmion based racetrack is proposed to overcome the limitations of the domain wall based racetrack. 8,25 One of the attractive features of the skyrmion racetrack is the small distance between two skyrmions, as their diameters can be compressed by reducing the width of the nanotrack, resulting in great potential for high-density data storage.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Controlled manipulation of skyrmions with respect to their direction and speed is an important aspect of employing skyrmions in device applications. , Under the driving current, the spin topology of skyrmion results in a deflection in its trajectory due to the Magnus force , that is characterized by the skyrmion Hall angle (ϕ SkH ). , It provides a new degree of freedom to control the skyrmion motion. The skyrmions can be driven by an electric current either via the spin-transfer torque (STT) , or the spin orbit torque (SOT). , The skyrmion based racetrack is proposed to overcome the limitations of the domain wall based racetrack. , One of the attractive features of the skyrmion racetrack is the small distance between two skyrmions, as their diameters can be compressed by reducing the width of the nanotrack, resulting in great potential for high-density data storage. , Therefore, the research on skyrmion based logic devices has attracted a lot of attention recently. Several logic devices have been proposed where the skyrmions are driven by the current density governed by the STT and skyrmion Hall effect (SkHE). ,, It was proven that the skyrmion motion requires 3–4 orders of less current density than the domain wall based devices. , However, the implementation of STT driven skyrmion based logic devices faces a major challenge due to limited spin polarization of the FM and possible Joule heating in the device .…”

Section: Introductionmentioning

confidence: 99%

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Reconfigurable Logic Operations via Gate Controlled Skyrmion Motion in a Nanomagnetic Device

Paikaray

Kuchibhotla

Haldar

et al. 2022

ACS Appl. Electron. Mater.

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Owing to the topological protection and the ease of efficient manipulation, skyrmions have emerged as potential candidates for carrying information in future memory and logic devices. Here, we have proposed a reconfigurable skyrmion based two-input logic device architecture. Using micromagnetic simulations, we have demonstrated that the device is capable of performing both OR and AND logic gate functionalities in a reconfigurable manner. Different logic functionality of the device is selected by using a current through a nonmagnetic metallic gate, and the resultant Oersted field controls the trajectory of the skyrmion, which in turn determines the logic states. The logic functions are implemented on a ferromagnet/heavy metal bilayer device structure by virtue of several physical effects, such as the spin−orbit torque, skyrmion−edge repulsion, skyrmion−skyrmion topological repulsion, and skyrmion Hall effect. The skyrmion trajectory has been characterized by estimating the skyrmion Hall angle. A wide range of operations by varying the current density, skyrmion velocity, Dzyaloshinskii−Moriya interaction, magnetic anisotropy, and geometrical parameters have been presented in detail. We believe that our spin orbit torque driven logic design will have potential implications for a high-speed and low-power skyrmion based computing architecture.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reconfigurable Logic Operations via Gate Controlled Skyrmion Motion in a Nanomagnetic Device

Paikaray

Kuchibhotla

Haldar

et al. 2022

ACS Appl. Electron. Mater.

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“…Besides that, another method that has been proved to be efficient in controlling the spin textures is based on the voltage-controlled magnetic anisotropy (VCMA) effect [24,25]. Based on this strategy, the magnetic anisotropy gradient has been widely used in the manipulation of spin textures [26][27][28][29][30][31][32][33][34][35]. Skyrmion bags, as spin textures with arbitrary topological charge [36][37][38], are expected to become the information carriers for multiple-data and high-density racetrack memory [39][40][41] and interconnect device [42,43].…”

Section: Introductionmentioning

confidence: 99%

The skyrmion bags in an anisotropy gradient

Zeng¹,

Mehmood²,

Ma³

et al. 2022

J. Phys.: Condens. Matter

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Skyrmion bags as spin textures with arbitrary topological charge are expected to be the carriers in racetrack memory. Here, we theoretically and numerically investigated the dynamics of skyrmion bags in an anisotropy gradient. It is found that, without the boundary potential, the dynamics of skyrmion bags are dependent on the spin textures, and the velocity of skyrmionium with Q = 0 is faster than other skyrmion bags. However, when the skyrmion bags move along the boundary, the velocities of all skyrmion bags with different Q are same. In addition, we theoretically derived the dynamics of skyrmion bags in the two cases using the Thiele approach and discussed the scope of Thiele equation. Within a certain range, the simulation results are in good agreement with the analytically calculated results. Our findings provide an alternative way to manipulate the racetrack memory based on the skyrmion bags.

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“…However, considering a particular material with a given DMI and a Zeeman field, the antiskyrmion is not a stable solution and decays due to Gilbert damping [27]. One could then envisage a path to stabilize skyrmions and antiskyrmions simultaneously [28] in such a way that the skyrmion Hall effect could be suppressed [29]. Therefore, since these topological objects, in general, cannot live together in the same compound for a long time, we think in the possibility of joining two different materials to perform this kind of task.…”

Section: Introductionmentioning

confidence: 99%

Magnus-force induced skyrmion–antiskyrmion coupling in inhomogeneous racetrack

Silva¹,

Silva²,

Pereira³

2020

J. Phys.: Condens. Matter

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In this paper we investigate a magnetic racetrack consisting of a junction of three materials with different properties. Indeed, this magnetic system is composed by two distinct regions (racetracks) connected by a thin interface: the first region (termed sector 1) has isotropic in-plane magnetic chirality and supports skyrmion (S) excitations while the second (sector 3) has anisotropic chirality and consequently supports antiskyrmions (A). The interface, which would be a third region (sector 2, connecting sectors 1 and 3) located in the central part of the racetrack, is an easy-axis Heisenberg ferromagnetic material. The topological structures S and A are put in motion by applying a spin-polarized current. Under certain conditions, we show that the skyrmion and the antiskyrmion created in their respective sectors are simultaneously impelled to the interface (due to the Magnus force) to apparently become a unique object (a skyrmion–antiskyrmion pair or SAP). After glued by sector 2, the skyrmion and the antiskyrmion move together (as a SAP) along the direction of the applied current. It is also shown that such an engineered racetrack can support a sequence of several SAP structures in motion, forming a current.

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Dynamics of antiskyrmions induced by the voltage-controlled magnetic anisotropy gradient

Cited by 17 publications

References 60 publications

Reconfigurable Logic Operations via Gate Controlled Skyrmion Motion in a Nanomagnetic Device

Reconfigurable Logic Operations via Gate Controlled Skyrmion Motion in a Nanomagnetic Device

The skyrmion bags in an anisotropy gradient

Magnus-force induced skyrmion–antiskyrmion coupling in inhomogeneous racetrack

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