Dynamics of antiferromagnetic skyrmions in the absence or presence of pinning defects

Jin, Zuanming; Liu, T. T.; Li, W. H.; Zhang, X. M.; Hou, Zhipeng; Chen, Deyang; Fan, Zhen; Zeng, Min; Lu, Xubing; Gao, Xingsen; Qin, Minghui; Liu, J.-M.

doi:10.1103/physrevb.102.054419

Cited by 24 publications

(8 citation statements)

References 54 publications

(66 reference statements)

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“…Moreover, the calculated skyrmion radii are also given to help one to understand the results easier. The same as our earlier theoretical calculations, the radius is increased with the increase of D [33,34]. On one hand, the interacting area between the spin wave and skyrmion is enlarged [35], resulting in the increase of interacting force and skyrmion speed.…”

Section: Resultssupporting

confidence: 83%

Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

et al. 2021

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An investigation of spin waves interacting with antiferromagnetic spin textures is meaningful for future spintronic and magnonic-based memory and logic applications. In this work, we numerically study the skyrmion dynamics driven by circularly polarized spin waves in antiferromagnets and propose a method of suppressing the Hall motion. It is demonstrated that the application of two circularly polarized spin waves with opposite chirality allows the skyrmion motion straightly along the intersection line of the two spin wave sources. The skyrmion speed depending on these parameters of the spin waves and system is estimated, and a comparison with other methods is provided. Furthermore, two depinning behaviors of the skyrmion related to the strengths of the defect are also observed in the simulations. Thus, the proposed method could be used in precisely modulating the skyrmion dynamics, contributing to skyrmion-based memory device design.

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Section: Resultssupporting

confidence: 83%

Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

et al. 2021

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“…Similar to the earlier work [38], we study a two-dimensional AFM model in the xy-plane with two magnetic sublattices that have magnetic moments m1 and m2 respectively, satisfying condition |m1| = |m2| = S with spin length S. The normalized staggered Néel vector n is defined as n = (m1  m2)/2S [39] to describe the Lagrangian. Taking into account the exchange energy, the anisotropy energy, and the interfacial DMI as well, one has the Lagrangian density L given by [40]:…”

Section: Model and Methodsmentioning

confidence: 99%

Magnon-driven skyrmion dynamics in antiferromagnets: Effect of magnon polarization

et al. 2021

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The controllable magnetic skyrmion motion represents a highly concerned issue in preparing advanced skyrmion-based spintronic devices. Specifically, magnon-driven skyrmion motion can be easily accessible in both metallic and insulating magnets, and thus is highly preferred over electric current control further for the ultra-low energy consumption. In this work, we investigate extensively the dynamics of skyrmion motion driven by magnon in an antiferromagnet using the collective coordinate theory, focusing on the effect of magnon polarization. It is revealed that the skyrmion Hall motion driven by circularly polarized magnon becomes inevitable generally, consistent with earlier report. Furthermore, the elastic scattering theory and numerical results unveil the strong inter-dependence between the linearly polarized magnon and skyrmion motion, suggesting the complicated dependence of the skyrmion motion on the polarization nature of driving magnon. On the reversal, the scattering from the moving skyrmion may lead to decomposition of the linearly polarized magnon into two elliptically polarized magnon bands. Consequently, a net transverse force acting on skyrmion is generated owing to the broken mirror symmetry, which in turn drives a skyrmion Hall motion. The Hall motion can be completely suppressed only in some specific condition where the mirror symmetry is preserved. The present work unveils non-trivial skyrmion-magnon scattering behavior in antiferromagnets, advancing the antiferromagnetic spintronics and benefiting to high-performance devices.

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“…In the ground state, the 2D AFM layer consists of two coupled sub-lattices (A) and (B) that are completely polarized to each other. The 2D topological soliton (AFM skyrmion) can also be nucleated, moved, and converted into an AFM DW pair in AFM systems 21,23 either by STTs, SOTs, or spin waves [24][25][26] as the FM skyrmion. Furthermore, the processing speed of AFM skyrmion is much higher than that of FM skyrmion 23 .…”

Section: Nucleation and Manipulation Of Single Skyrmions Using Spin-p...mentioning

confidence: 99%

Nucleation and manipulation of single skyrmions using spin-polarized currents in antiferromagnetic skyrmion-based racetrack memories

Belrhazi

Hafidi

2022

Sci Rep

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In this work, an ultrafast nucleation of an isolated anti-ferromagnetic (AFM) skyrmion was reported in an AFM layer with DMi strengths of 0.47$$-$$ - 0.32 $$\mathrm{mJ}/{\mathrm{m}}^{2}$$ mJ / m 2 using spin-transfer torque by locally injecting pure spin currents into magnetic tracks. Besides, we revealed the key advantages of AFM skyrmion-based racetrack memories by comparing the motion of AFM and FM skyrmions driven by spin–orbit torques (SOTs) for different skyrmion sizes along racetrack memories with various notch sizes. Our results indicate that for AFM skyrmion, the skyrmion Hall effect does not exist during the skyrmion motion, therefore at small skyrmion sizes, we succeeded to overcome the repulsive forces developed in the notch area for low and large SOTs. The obtained findings were carefully analyzed by computing the variation of energy barriers associated with the notch for different skyrmion sizes using minimum energy path (MEP) calculations. We showed that the larger the skyrmion size, the harder it is to shrink the skyrmion in the notch which produces a high energy barrier (Eb) for large skyrmion sizes. Moreover, as the notch size increases, the skyrmion size shrinks further, and hence Eb increases proportionally. Nevertheless, we proved that AFM skyrmions are more efficient and flexible than FM skyrmions against boundary forces.

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Dynamics of antiferromagnetic skyrmions in the absence or presence of pinning defects

Cited by 24 publications

References 54 publications

Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

Magnon-driven skyrmion dynamics in antiferromagnets: Effect of magnon polarization

Nucleation and manipulation of single skyrmions using spin-polarized currents in antiferromagnetic skyrmion-based racetrack memories

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