Target-skyrmions and skyrmion clusters in nanowires of chiral magnets
In bulk non-centrosymmetric magnets the chiral Dzyaloshinskii-Moriya exchange stabilizes tubular skyrmions with a reversed magnetization in their centers. While the double-twist is favorable in the center of a skyrmion, it gives rise to an excess of the energy density at the outskirt. Therefore, mag...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2014-07-01
|
| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20147505002 |
| _version_ | 1818832666671185920 |
|---|---|
| author | Leonov A. O. Rößler U. K. Mostovoy M. |
| author_facet | Leonov A. O. Rößler U. K. Mostovoy M. |
| author_sort | Leonov A. O. |
| collection | DOAJ |
| description | In bulk non-centrosymmetric magnets the chiral Dzyaloshinskii-Moriya exchange stabilizes tubular skyrmions with a reversed magnetization in their centers. While the double-twist is favorable in the center of a skyrmion, it gives rise to an excess of the energy density at the outskirt. Therefore, magnetic anisotropies are required to make skyrmions more favorable than the conical spiral in bulk materials. Using Monte Carlo simulations, we show that in magnetic nanowires unusual skyrmions with a doubly twisted core and a number of concentric helicoidal undulations (target-skyrmions) are thermodynamically stable even in absence of single-ion anisotropies. Such skyrmions are free of magnetic charges and carry a non-integer skyrmion charge s. This state competes with clusters of s = 1 skyrmions. For very small radii, the target-skyrmion transforms into a skyrmion with s < 1, that resembles the vortex-like state stabilized by surface-induced anisotropies. |
| first_indexed | 2024-12-19T02:06:40Z |
| format | Article |
| id | doaj.art-77b37a3e68a24707899aca7c44283046 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-19T02:06:40Z |
| publishDate | 2014-07-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-77b37a3e68a24707899aca7c442830462022-12-21T20:40:55ZengEDP SciencesEPJ Web of Conferences2100-014X2014-07-01750500210.1051/epjconf/20147505002epjconf_jems2014_05002Target-skyrmions and skyrmion clusters in nanowires of chiral magnetsLeonov A. O.0Rößler U. K.1Mostovoy M.2Zernike Institute for Advanced Materials, University of GroningenLeibniz Institute for Solid State and Materials Research, IFWZernike Institute for Advanced Materials, University of GroningenIn bulk non-centrosymmetric magnets the chiral Dzyaloshinskii-Moriya exchange stabilizes tubular skyrmions with a reversed magnetization in their centers. While the double-twist is favorable in the center of a skyrmion, it gives rise to an excess of the energy density at the outskirt. Therefore, magnetic anisotropies are required to make skyrmions more favorable than the conical spiral in bulk materials. Using Monte Carlo simulations, we show that in magnetic nanowires unusual skyrmions with a doubly twisted core and a number of concentric helicoidal undulations (target-skyrmions) are thermodynamically stable even in absence of single-ion anisotropies. Such skyrmions are free of magnetic charges and carry a non-integer skyrmion charge s. This state competes with clusters of s = 1 skyrmions. For very small radii, the target-skyrmion transforms into a skyrmion with s < 1, that resembles the vortex-like state stabilized by surface-induced anisotropies.http://dx.doi.org/10.1051/epjconf/20147505002 |
| spellingShingle | Leonov A. O. Rößler U. K. Mostovoy M. Target-skyrmions and skyrmion clusters in nanowires of chiral magnets EPJ Web of Conferences |
| title | Target-skyrmions and skyrmion clusters in nanowires of chiral magnets |
| title_full | Target-skyrmions and skyrmion clusters in nanowires of chiral magnets |
| title_fullStr | Target-skyrmions and skyrmion clusters in nanowires of chiral magnets |
| title_full_unstemmed | Target-skyrmions and skyrmion clusters in nanowires of chiral magnets |
| title_short | Target-skyrmions and skyrmion clusters in nanowires of chiral magnets |
| title_sort | target skyrmions and skyrmion clusters in nanowires of chiral magnets |
| url | http://dx.doi.org/10.1051/epjconf/20147505002 |
| work_keys_str_mv | AT leonovao targetskyrmionsandskyrmionclustersinnanowiresofchiralmagnets AT roßleruk targetskyrmionsandskyrmionclustersinnanowiresofchiralmagnets AT mostovoym targetskyrmionsandskyrmionclustersinnanowiresofchiralmagnets |