Manipulating skyrmions in synthetic antiferromagnetic nanowires by magnetic field gradients

Zhou, Shihong; Wang, Chengjie; Zheng, Cuixiu; Liu, Yaowen

doi:10.1016/j.jmmm.2019.165740

Cited by 17 publications

(4 citation statements)

References 35 publications

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“…This aspect also limits the maximum applicable current and hence the maximum velocity achievable for the skyrmion. Several strategies have been considered in recent years to solve this issue, such as the use of coupled skyrmions with opposite skyrmion numbers in compensated ferrimagnets [32], synthetic antiferromagnets [33][34][35][36][37], antiferromagnets [38][39][40][41][42][43], and the use of tracks with engineered anisotropy [44][45][46]. Here, we propose to exploit an 'unconventional' SOT [47,48] driving source, by considering the noncollinear low-symmetry spin source layer with spin moments mixed by Rashba-like S y , Dresselhaus-like S x and out-of-plane like S z .…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit torque driven skyrmion motion under unconventional spin Hall effect

et al. 2022

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The effective control of skyrmion motion is a critical aspect for realizing skyrmion-based devices. Among the potential directions, the use of current induced spin-orbit torque (SOT) is energetically efficient. However, the conventional heavy metals with high crystal symmetry limit the charge-to-spin conversion to the orthogonal configuration, which leads the skyrmions to deflect from the electrical current direction with a finite skyrmion Hall angle. Here, we investigate the spin-orbit torque driven skyrmion motion under unconventional spin Hall effect. We systematically study the effect of non-collinear low-symmetry spin source layer with spin moments mixed by Rashba-like Sy, Dresselhaus-like Sx and out-of-plane like Sz, on skyrmion features (velocity, diameter and Hall angle) stabilized in ferromagnet/WTe2 heterostructure. Our results may provide a new degree of freedom for controlling the skyrmion Hall angle, and can open the way for the discovery of new ferromagnetic multilayer where the skyrmion Hall angle is suppressed by a proper design of different SOT driven forces.

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Section: Introductionmentioning

confidence: 99%

Spin–orbit torque driven skyrmion motion under unconventional spin Hall effect

et al. 2022

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“…Magnetic strips presenting spatial variations of the material parameters can be intentionally incorporated into the nanotrack to gererate attractive or repulsive interactions, and it can be used to modify the dynamics of ferromagnetic skyrmion. (2) Through the manipulation of skyrmions in synthetic antiferromagnetic nanotracks [49][50][51][52][53][54] , that is, a ferromagnetic bilayer coupled antiferromagnetically. In this strategy, the RKKY interaction is responsible for the coupling between the two skyrmions located on the top and bottom layers 55 .…”

Section: Introductionmentioning

confidence: 99%

Traps for pinning and scattering of antiferromagnetic skyrmions via magnetic properties engineering

Toscano,

Santece,

Guedes

et al. 2020

Preprint

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“…The interest in skyrmions in SAF-MMLs surged after the experimental observation of individual 10 nm size AFM-coupled skyrmions at room temperature by Legrand et al [44]. Although compared to ferromagnetic skyrmions [45][46][47][48][49] some advantages have theoretically been predicted for AFM-coupled skyrmions, such as higher speed, smaller size and more stability, and it has been shown experimentally that skyrmions in SAF have the potential to be small and stable, material systems that could host AFM-coupled skyrmions with optimal properties are still rare. At present, Ruthenium is typically used to experimentally induce AFM coupling in Cobased multilayers [34,44,[50][51][52].…”

Section: Introductionmentioning

confidence: 99%

Material systems for FM-/AFM-coupled skyrmions in Co/Pt-based multilayers

Jia,

Zimmermann,

Hoffmann

et al. 2020

Preprint

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Antiferromagnetically coupled magnetic skyrmions are considered ideal candidates for highdensity information carriers. This is due to the suppressed skyrmion Hall effect compared to conventional skyrmions and a smaller size due to the cancellation of some contributions to the magnetostatic dipolar fields. By means of systematic first-principles calculations based on density functional theory we search for suitable materials that can host antiferromagnetically coupled skyrmions. We concentrate on fcc-stacked (111)-oriented metallic Z/Co/Pt (Z = 4d series: Y-Pd, the noble metals: Cu, Ag, Au, post noble metals: Zn and Cd) magnetic multilayers of films of monatomic thickness. We present quantitative trends of magnetic properties: Magnetic moments, interlayer exchange coupling, spin-stiffness, Dzyaloshinskii-Moriya interaction, magnetic anisotropy, and the critical temperature. We show that some of the Z elements (Zn, Y, Zr, Nb, Tc, Ru, Rh, and Cd) can induce antiferromagnetic interlayer coupling between the magnetic Co layers, and that they influence the easy magnetization axis. Employing a multiscale approach, we transfer the micromagnetic parameters determined from ab initio to a micromagnetic energy functional and search for one-dimensional spin-spiral solutions and two-dimensional skyrmions. We determine the skyrmion radius by numerically solving the equation of the skyrmion profile. We found an analytical expression for the skyrmion radius that covers our numerical results and is valid for a large regime of micromagnetic parameters. Based on this expression we have proposed a model that allows to extrapolate from the ab initio results of monatomic films to multilayers with Co films consisting of several atomic layers containing 10 nm skyrmions. We found thickness regimes where tiny changes of the film thickness may alter the skyrmion radius by an orders of magnitude. We estimated the skyrmion size as function of temperature and found that the size can easily double going from cryogenic to room temperature. We suggest promising material systems for ferromagnetically and antiferromagnetically coupled spin-spiral and skyrmion systems.

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Manipulating skyrmions in synthetic antiferromagnetic nanowires by magnetic field gradients

Cited by 17 publications

References 35 publications

Spin–orbit torque driven skyrmion motion under unconventional spin Hall effect

Spin–orbit torque driven skyrmion motion under unconventional spin Hall effect

Traps for pinning and scattering of antiferromagnetic skyrmions via magnetic properties engineering

Material systems for FM-/AFM-coupled skyrmions in Co/Pt-based multilayers

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