Optimal skyrmion stability in antisymmetric ultrathin ferromagnetic bilayers
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | |
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| _version_ | 1866910097553227776 |
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| author | Bernand-Mantel, Anne Slastikov, Valeriy V. Muratov, Cyrill B. |
| author_facet | Bernand-Mantel, Anne Slastikov, Valeriy V. Muratov, Cyrill B. |
| contents | We demonstrate the stray-field-mediated skyrmion stabilizing
capabilities of ultrathin exchange-decoupled antisymmetric
ferromagnetic bilayers based on conventional transition metal
materials. Using an asymptotically exact micromagnetic model valid
in the ultrathin film limit, we show that the antisymmetric
tailoring of the bilayer allows the Dzyaloshinskii-Moriya
interaction and the dipolar interaction to act synergistically to
stabilize skyrmions, in contrast to the monolayer case, in which
these energies compete. To obtain optimal stability of these
skyrmions against collapse and bursting -- the two fundamental
processes determining skyrmion lifetime, we carry out an asymptotic
analysis of the saddle point solution that separates the skyrmion
from the demagnetized state. The result is an optimal stability line
for compact skyrmions in the non-dimensional parameter space of the
effective Dzyaloshinskii-Moriya interaction strength and the
effective film thickness. Our predictions are confirmed by extensive
micromagnetic simulations of antisymmetric bilayers, using magnetic
parameters of the conventional Pt/Co/AlO$_x$ systems. Our results
provide a new pathway for experimental observations of 10 nm radius
zero-field skyrmions with lifetimes compatible with information
technology applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02070 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Optimal skyrmion stability in antisymmetric ultrathin ferromagnetic bilayers Bernand-Mantel, Anne Slastikov, Valeriy V. Muratov, Cyrill B. Mesoscale and Nanoscale Physics Mathematical Physics Analysis of PDEs Pattern Formation and Solitons We demonstrate the stray-field-mediated skyrmion stabilizing capabilities of ultrathin exchange-decoupled antisymmetric ferromagnetic bilayers based on conventional transition metal materials. Using an asymptotically exact micromagnetic model valid in the ultrathin film limit, we show that the antisymmetric tailoring of the bilayer allows the Dzyaloshinskii-Moriya interaction and the dipolar interaction to act synergistically to stabilize skyrmions, in contrast to the monolayer case, in which these energies compete. To obtain optimal stability of these skyrmions against collapse and bursting -- the two fundamental processes determining skyrmion lifetime, we carry out an asymptotic analysis of the saddle point solution that separates the skyrmion from the demagnetized state. The result is an optimal stability line for compact skyrmions in the non-dimensional parameter space of the effective Dzyaloshinskii-Moriya interaction strength and the effective film thickness. Our predictions are confirmed by extensive micromagnetic simulations of antisymmetric bilayers, using magnetic parameters of the conventional Pt/Co/AlO$_x$ systems. Our results provide a new pathway for experimental observations of 10 nm radius zero-field skyrmions with lifetimes compatible with information technology applications. |
| title | Optimal skyrmion stability in antisymmetric ultrathin ferromagnetic bilayers |
| topic | Mesoscale and Nanoscale Physics Mathematical Physics Analysis of PDEs Pattern Formation and Solitons |
| url | https://arxiv.org/abs/2604.02070 |