Skyrmions in antiferromagnets: Thermal stability and the effect of external field and impurities

Potkina, M. N.; Lobanov, I. S.; Jónsson, Hannes; Uzdin, V. M.

doi:10.1063/5.0009559

Cited by 32 publications

(24 citation statements)

References 46 publications

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“…3 for various impurity sizes as a function of track width W . For any particular size of the impurity the pinning barrier is less than barrier for the detachment, which is in agreement with the previous results [20,36]. The difference in the activation energies means that Sk will occupy nonmagnetic impurities if thermal energy will be enough to overcome the barrier for attachment but not so large to dissociate from defect immediately.…”

Section: Effects Of Impurity Size and Track Widthsupporting

confidence: 91%

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Nonmagnetic impurities in skyrmion racetrack memory

Potkina¹,

Lobanov²,

Uzdin³

2020

Nanosystems: Phys. Chem. Math.

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Section: Effects Of Impurity Size and Track Widthsupporting

confidence: 91%

“…For larger current density and multi-Sk states, more complex behavior such as the rotation of the Sk lattices [19] may appear. Zero Hall angle can be achieved with antiferromagnetic Sk [11,20] or antiskyrmions for a specific direction of current flow [21,22].…”

Section: Introductionmentioning

confidence: 99%

Nonmagnetic impurities in skyrmion racetrack memory

Potkina¹,

Lobanov²,

Uzdin³

2020

Nanosystems: Phys. Chem. Math.

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“…Note that the expression for λ can also be written in a different form, see ref. 77 for details. Expression (17) for λ in fact does not require the calculation of the eigenvectors of H SP .…”

Section: Evaluation Of the Dynamical Factormentioning

confidence: 99%

Toward room-temperature nanoscale skyrmions in ultrathin films

et al. 2020

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Breaking the dilemma between small size and room-temperature stability is a necessary prerequisite for skyrmion-based information technology. Here we demonstrate by means of rate theory and an atomistic spin Hamiltonian that the stability of isolated skyrmions in ultrathin ferromagnetic films can be enhanced by the concerted variation of magnetic interactions while keeping the skyrmion size unchanged. We predict film systems where the lifetime of sub-10 nm skyrmions can reach years at ambient conditions. The long lifetime of such small skyrmions is due to exceptionally large Arrhenius pre-exponential factor and the stabilizing effect of the energy barrier is insignificant at room temperature. A dramatic increase in the pre-exponential factor is achieved thanks to the softening of magnon modes of the skyrmion, thereby increasing the entropy of the skyrmion with respect to the transition state for collapse. Increasing the number of skyrmion deformation modes should be a guiding principle for the realization of nanoscale, room-temperature stable skyrmions.

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“…The lifetime of the topological states of systems without strong dipole interaction at an arbitrary temperature can be evaluated using standard TST approach. It was done for Sk in AF [15] and for small-size Sk in ferromagnetic (FM) materials [6]. Such calculations for FM micromagnetic structures are a challenging problem due to the number of degrees of freedom and need to correctly take into account the dipole-dipole interaction.…”

Section: Introductionmentioning

confidence: 99%

Demagnetizing fields in chiral magnetic structures

Moskalenko¹,

Lobanov²,

Uzdin³

2020

Nanosystems: Phys. Chem. Math.

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A method for calculating the magnetic dipole-dipole interaction in topological magnetic systems has been developed. It can be used to calculate stable states and minimum energy paths that determine the magnetic transition in chiral magnetic structures. Instead of directly summing the dipole interactions between magnetic moments/magnetic elements, we solve a local equation for demagnetizing fields. The states corresponding to the local energy minimum can be found using the Lagrange method for the conditional extrema. The efficiency of the algorithm has been demonstrated by calculating the dependence of the size and shape of magnetic skyrmions and anti-skyrmions on the magnitude of magnetization.

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Skyrmions in antiferromagnets: Thermal stability and the effect of external field and impurities

Abstract: Paper published as part of the special topic on Antiferromagnetic Spintronics Note: This paper is part of the special topic on Antiferromagnetic Spintronics.

Cited by 32 publications

References 46 publications

Nonmagnetic impurities in skyrmion racetrack memory

Nonmagnetic impurities in skyrmion racetrack memory

Toward room-temperature nanoscale skyrmions in ultrathin films

Demagnetizing fields in chiral magnetic structures

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