Stabilizing skyrmions by nonuniform strain in ferromagnetic thin films without a magnetic field

Shi, Yinuo; Wang, Jie

doi:10.1103/physrevb.97.224428

Cited by 16 publications

(7 citation statements)

References 32 publications

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“…[40] Moreover, we discovered that, within the j range from 3.0 × 10 10 to 3.8 × 10 10 A m −2 , the current pulse was unable to drive a continuous, directional skyrmion motion (see Movies S1-S3, Supporting Information), which has been widely reported in previous theoretical and experimental studies. [11][12][13]27,41] The absence of skyrmion motion could be attributed to the dense arrangement of skyrmions along the nanotrack, which led to a strong pinning effect on the skyrmion motion due to the repulsive potential between neighboring skyrmions. [42,43] Furthermore, we explored the dynamic behaviors of the elliptical skyrmions at a higher B of 180 mT.…”

Section: Current-driven Dynamics Of Elliptically Distorted Skyrmionsmentioning

confidence: 99%

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

et al. 2023

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Skyrmions are swirling spin textures with topological characters promising for future spintronic applications. Skyrmionic devices typically rely on the electrical manipulation of skyrmions with a circular shape. However, manipulating elliptically distorted skyrmions can lead to numerous exotic magneto-electrical functions distinct from those of conventional circular skyrmions, significantly broadening the capability to design innovative spintronic devices. Despite the promising potential, its experimental realization so far remains elusive. In this study, the current-driven dynamics of the elliptically distorted skyrmions in geometrically confined magnet Fe 3 Sn 2 is experimentally explored. This study finds that the elliptical skyrmions can reversibly split into smaller-sized circular skyrmions at a current density of 3.8 × 10 10 A m −2 with the current injected along their minor axis. Combined experiments with micromagnetic simulations reveal that this dynamic behavior originates from a delicate interplay of the spin-transfer torque, geometrical confinement, and pinning effect, and strongly depends on the ratio of the major axis to the minor axis of the elliptical skyrmions. The results indicate that the morphology is a new degree of freedom for manipulating the current-driven dynamics of skyrmions, providing a compelling route for the future development of spintronic devices.

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Section: Current-driven Dynamics Of Elliptically Distorted Skyrmionsmentioning

confidence: 99%

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

et al. 2023

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“…To reduce the energy consumption and Joule heating of skyrmionic devices, various operating schemes, such as gate voltage, − ultrafast laser pulse, magnons, thermal excitations, and adsorption/desorption, , have been theoretically proposed or experimentally realized. In addition to these approaches, increasing attention has been focused on the strain-based strategy, driven not only by its low energy consumption but also by the intriguing magnetoelastic responses. − One of the notable examples is that Shibata et al found a low anisotropic uniaxial strain of 0.3% could induce a 20% distortion in its skyrmion lattice along the strain axis in the chiral crystal FeGe . More recently, Hou et al demonstrated that strain could trigger controllable four-state switching of the number of skyrmions in geometrically confined nanodots .…”

Section: Introductionmentioning

confidence: 99%

Strain-Induced Reversible Motion of Skyrmions at Room Temperature

Liu,

Wang,

et al. 2023

ACS Nano

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Magnetic skyrmions are topologically protected swirling spin textures with great potential for future spintronic applications. The ability to induce skyrmion motion using mechanical strain not only stimulates the exploration of exotic physics but also affords the opportunity to develop energy-efficient spintronic devices. However, the experimental realization of strain-driven skyrmion motion remains a formidable challenge. Herein, we demonstrate that the inhomogeneous uniaxial compressive strain can induce the movement of isolated skyrmions from regions of high strain to regions of low strain at room temperature, which was directly observed using an in situ Lorentz transmission electron microscope with a specially designed nanoindentation holder. We discover that the uniaxial compressive strain can transform skyrmions into a single domain with in-plane magnetization, resulting in the coexistence of skyrmions with a single domain along the direction of the strain gradient. Through comprehensive micromagnetic simulations, we reveal that the repulsive interactions between skyrmions and the single domain serve as the driving force behind the skyrmion motion. The precise control of skyrmion motion through strain provides exciting opportunities for designing advanced spintronic devices that leverage the intricate interplay between strain and magnetism.

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“…A number of experimental and theoretical investigations have already demonstrated the possibility of controlling individual skyrmion in bulk and thin film, including skyrmion generation, transfer, and deletion via magnetic fields [5], local heating [6,7], spin-polarized current [8][9][10], and other mechanisms such as topological transitions [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Creation and Destruction of Skyrmions via Electrical Modulation of Local Magnetic Anisotropy in Magnetic Thin Films

Semenov

2019

Phys. Rev. Applied

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Formation and dissolution of skyrmions via local modulation of magnetic anisotropy is theoretically explored in ferromagnetic (FM) and antiferromagnetic (AFM) thin-film structures. Using a micromagnetic simulation, the spatial and temporal evolution of spin textures are analyzed while the effect of externally controlled effective magnetic anisotropy is introduced for a finite duration. Simulation results clearly indicate that the Néel-type skyrmions can be excited and destroyed in a FM or an AFM layer in selected parameter windows, enabling deterministic encoding of logical states "1" and "0" in this physical system. The characteristic times for the dynamical responses are much faster in the AFMs, particularly in the creation process. The size of the excitation region can be scaled down to the sub-10 nm range in the radius. The investigation also examines the effect of inhomogeneous in-plane magnetic properties, further elucidating the feasibility in realistic conditions. Considering the low power and locally controlled nature of magnetic anisotropy modulation, this approach is expected to provide a highly efficient means for achieving skyrmion based devices. The AFMs offer a particularly promising opportunity.

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Stabilizing skyrmions by nonuniform strain in ferromagnetic thin films without a magnetic field

Cited by 16 publications

References 32 publications

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

Strain-Induced Reversible Motion of Skyrmions at Room Temperature

Creation and Destruction of Skyrmions via Electrical Modulation of Local Magnetic Anisotropy in Magnetic Thin Films

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Stabilizing skyrmions by nonuniform strain in ferromagnetic thin films without a magnetic field

Cited by 16 publications

References 32 publications

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe3Sn2 Nanotrack

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe3Sn2 Nanotrack

Strain-Induced Reversible Motion of Skyrmions at Room Temperature

Creation and Destruction of Skyrmions via Electrical Modulation of Local Magnetic Anisotropy in Magnetic Thin Films

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Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack