| Autor: |
Kravchuk, V. P., Rößler, U. K., Volkov, O. M., Sheka, D. D., Brink, J., Makarov, D., Fangohr, H., Gaididei, Y. |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
Physical Review B 8(2016)94, 144402 |
| Popis: |
Topologically stable structures, e.g. vortices in a wide variety of matter, skyrmions in ferro- and antiferromagnets, hedgehog point defects in liquid crystals and ferromagnets, are characterized by integer valued topological quantum numbers. In this context the closed surfaces are a prominent subject of study, because they realize a link between fundamental mathematical theorems and real physical systems. Here we perform a topological analysis of equilibrium magnetization states for a thin spherical shell with easy-normal anisotropy. Skyrmion solutions are found for a range of parameters. These magnetic skyrmions on a spherical shell have two principal differences compared to the planar case: (i) they become topologically trivial, and (ii) can be stabilized by curvature effects only, also when Dzyaloshinskii-Moriya interactions are absent. Due to its specific topological nature a skyrmion on a spherical shell can be simply induced by an uniform external magnetic field. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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