Bilayer skyrmion dynamics on a magnetic anisotropy gradient
Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-cou...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ab1171 |
| _version_ | 1797750141576282112 |
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| author | Calvin Ching Ian Ang Weiliang Gan Wen Siang Lew |
| author_facet | Calvin Ching Ian Ang Weiliang Gan Wen Siang Lew |
| author_sort | Calvin Ching Ian Ang |
| collection | DOAJ |
| description | Magnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-coupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s ^–1 . For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems. |
| first_indexed | 2024-03-12T16:28:23Z |
| format | Article |
| id | doaj.art-605a35ab4f77446ea224a4441fa17ba9 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:28:23Z |
| publishDate | 2019-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-605a35ab4f77446ea224a4441fa17ba92023-08-08T15:35:40ZengIOP PublishingNew Journal of Physics1367-26302019-01-0121404300610.1088/1367-2630/ab1171Bilayer skyrmion dynamics on a magnetic anisotropy gradientCalvin Ching Ian Ang0https://orcid.org/0000-0001-9479-7011Weiliang Gan1Wen Siang Lew2School of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, 637371, SingaporeSchool of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, 637371, SingaporeSchool of Physical and Mathematical Sciences, Nanyang Technological University , 21 Nanyang Link, 637371, SingaporeMagnetic skyrmion transport has been primarily based on the use of spin torques which require high current densities and face performance deterioration associated with Joule heating. In this work, we derive an analytical model for energy efficient skyrmion propagation in an antiferromagnetically-coupled bilayer structure using a magnetic anisotropy gradient. The interlayer skyrmion coupling provides a strong restoring force between the skyrmions, which not only prevents annihilation but also increases their forward velocity up to the order of km s ^–1 . For materials with low Gilbert damping parameter, the interlayer skyrmion coupling force can be amplified up to ten times, with a corresponding increase in velocity. Furthermore, the analytical model also provides insights into the dynamics of skyrmion pinning and relaxation of asymmetric skyrmion pairs in bilayer-coupled skyrmion systems.https://doi.org/10.1088/1367-2630/ab1171bilayer skyrmionsskyrmion transportmagnetic anisotropy gradient |
| spellingShingle | Calvin Ching Ian Ang Weiliang Gan Wen Siang Lew Bilayer skyrmion dynamics on a magnetic anisotropy gradient New Journal of Physics bilayer skyrmions skyrmion transport magnetic anisotropy gradient |
| title | Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| title_full | Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| title_fullStr | Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| title_full_unstemmed | Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| title_short | Bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| title_sort | bilayer skyrmion dynamics on a magnetic anisotropy gradient |
| topic | bilayer skyrmions skyrmion transport magnetic anisotropy gradient |
| url | https://doi.org/10.1088/1367-2630/ab1171 |
| work_keys_str_mv | AT calvinchingianang bilayerskyrmiondynamicsonamagneticanisotropygradient AT weilianggan bilayerskyrmiondynamicsonamagneticanisotropygradient AT wensianglew bilayerskyrmiondynamicsonamagneticanisotropygradient |