Skyrmion inertia in synthetic antiferromagnets

Panigrahy, Sujit; Mallick, Sougata; Sampaio, João; Rohart, Stanislas

doi:10.1103/physrevb.106.144405

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…Note added in proof: During the review process, Panigrahy et al reported similar results on the skyrmion inertia in synthetic antiferromagnets (54).…”

Section: Discussion and Outlookmentioning

confidence: 84%

Fast current-induced skyrmion motion in synthetic antiferromagnets

Pham,

Sisodia,

Di Manici

et al. 2024

Science

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Magnetic skyrmions are topological magnetic textures that hold great promise as nanoscale bits of information in memory and logic devices. Although room-temperature ferromagnetic skyrmions and their current-induced manipulation have been demonstrated, their velocity has been limited to about 100 meters per second. In addition, their dynamics are perturbed by the skyrmion Hall effect, a motion transverse to the current direction caused by the skyrmion topological charge. Here, we show that skyrmions in compensated synthetic antiferromagnets can be moved by current along the current direction at velocities of up to 900 meters per second. This can be explained by the cancellation of the net topological charge leading to a vanishing skyrmion Hall effect. Our results open an important path toward the realization of logic and memory devices based on the fast manipulation of skyrmions in tracks.

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“…Note added in proof: During the review process, Panigrahy et al reported similar results on the skyrmion inertia in synthetic antiferromagnets (54).…”

Section: Discussion and Outlookmentioning

confidence: 84%

Fast current-induced skyrmion motion in synthetic antiferromagnets

Pham,

Sisodia,

Di Manici

et al. 2024

Science

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“…Skyrmion and its correspondents (such as bimerons [17,[58][59][60][61]) have become an essential subject since they have immense potential to be used as information carriers in future advanced memories, logic gates, and computing devices. In particular, they are predicted to display a vanishing gyrotropic deflection [62,63] in real antiferromagnetic materials [63] as well as in synthetic ones [64][65][66][67][68]. Thus, knowing all possible nuances associated with these topological spin textures in antiferromagnetic systems would be crucial.…”

Section: Discussionmentioning

confidence: 99%

Releasing antiferromagnetic skyrmions from local magnetic-anisotropy defects

Silva,

Pereira

2023

J. Phys.: Condens. Matter

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Lattice defects may work as a kind of apparatus for catching topological excitations, preventing their escape. So, the problem of removing skyrmions from eventual local defects in magnetic materials must be closely related to new technologies such as skyrmionic. Here, we examine the conditions for drawing a skyrmion from a magnetic impurity in a two-dimensional antiferromagnetic system by applying spin-polarized currents (SPC). Two types of impurities are investigated (local easy-axis and easy-plane anisotropy defects). Also, two methods to release the skyrmion with SPC are explored. In principle, our results could be qualitatively relevant to any other type of lattice defect.

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“…A recent investigation has shown that the bilayer of FM material (top and bottom layers) called synthetic antiferromagnetic (SAF) in nanowire structure have gained considerable interest in research that form a skyrmion pair with an opposite spin orientation, thus effectively suppressing the SkHE [35]. In this case, the strong antiferromagnetic (AFM) interlayer exchange coupling torque plays a crucial role.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion motion under temperature gradient and application in logic devices

Raj,

Bindal,

Kaushik

2023

Nanotechnology

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Under the presence of temperature gradient (TG) on a nanotrack, it is necessary to investigate the skyrmion dynamics in various magnetic systems under the combined effect of forces due to magnonic spin transfer torque ( μ S T T ) , thermal STT ( τ S T T ), entropic difference ( dS ) , as well as thermal induced dipolar field (DF). Hence, in this work, the dynamics of skyrmions in ferromagnets (FM), synthetic antiferromagnets (SAF), and antiferromagnets (AFM) have been studied under different TGs and damping constants ( α G ). It is observed that α G plays a major role in deciding the direction of skyrmion motion either towards the hotter or colder side in different magnetic structures. Later, FM skyrmion based logic device is proposed that consists of a cross-coupled nanotrack, where the skyrmions on horizontal and vertical nanotrack are controlled by exploiting TG and electrical STT (eSTT), respectively by taking the advantages of thermal induced skyrmion Hall effect (SkHE). The proposed device performs AND and OR logic functionalities simultaneously, when the applied current density is 2 × 10 11 A m - 2 . Moreover, the proposed device is also able to exhibit the half adder functionality by tuning the applied current density to 3 × 10 11 A m - 2 . The total energy consumption for AND and OR logic operation and half adder are 33.63 fJ and 25.06 fJ, respectively. This paves the way for the development of energy-efficient logic devices with ultra-high storage density.

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Skyrmion inertia in synthetic antiferromagnets

Cited by 9 publications

References 39 publications

Fast current-induced skyrmion motion in synthetic antiferromagnets

Fast current-induced skyrmion motion in synthetic antiferromagnets

Releasing antiferromagnetic skyrmions from local magnetic-anisotropy defects

Skyrmion motion under temperature gradient and application in logic devices

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