Electrical control of skyrmion density via skyrmion-stripe transformation
A comprehensive understanding of numerous electrical current-induced magnetic texture transformations is necessary to ensure the reliability of skyrmionic devices during operation. Here, we present an experimental study of unipolar current-induced skyrmion-stripe transformation in a Pt/Co/Fe/Ir magn...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Online Access: | https://hdl.handle.net/10356/145764 |
| _version_ | 1826127259638956032 |
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| author | Ang, Calvin Ching Ian Gan, Weiliang Wong, Grayson Dao Hwee Lew, Wen Siang |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Ang, Calvin Ching Ian Gan, Weiliang Wong, Grayson Dao Hwee Lew, Wen Siang |
| author_sort | Ang, Calvin Ching Ian |
| collection | NTU |
| description | A comprehensive understanding of numerous electrical current-induced magnetic texture transformations is necessary to ensure the reliability of skyrmionic devices during operation. Here, we present an experimental study of unipolar current-induced skyrmion-stripe transformation in a Pt/Co/Fe/Ir magnetic bilayer. High current density pulses induce a densely packed skyrmion state, as commonly reported in many other studies, and skyrmion nucleation is expected to lessen with diminishing current density. However, at a lower current density where pinning effects become significant, a regime where current-induced skyrmion annihilation and skyrmion-to-stripe transformation is observed. Kerr imaging reveals that, under a low current pulse, the rapidly expanding stripes crowd out and annihilate the skyrmions before quickly decaying and leaving behind a sparse skyrmion population. Our findings establish an additional requirement of a minimum operating current density in the design of skyrmionic devices to avoid unintended skyrmion deletion. On the other hand, this skyrmion annihilation can also be strategically employed as a technique for skyrmion density control using solely current modulation in future skyrmionic devices. |
| first_indexed | 2024-10-01T07:05:58Z |
| format | Journal Article |
| id | ntu-10356/145764 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:05:58Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1457642023-02-28T19:56:37Z Electrical control of skyrmion density via skyrmion-stripe transformation Ang, Calvin Ching Ian Gan, Weiliang Wong, Grayson Dao Hwee Lew, Wen Siang School of Physical and Mathematical Sciences Science::Physics Electrical Generation of Spin Carriers Magnetization Dynamics A comprehensive understanding of numerous electrical current-induced magnetic texture transformations is necessary to ensure the reliability of skyrmionic devices during operation. Here, we present an experimental study of unipolar current-induced skyrmion-stripe transformation in a Pt/Co/Fe/Ir magnetic bilayer. High current density pulses induce a densely packed skyrmion state, as commonly reported in many other studies, and skyrmion nucleation is expected to lessen with diminishing current density. However, at a lower current density where pinning effects become significant, a regime where current-induced skyrmion annihilation and skyrmion-to-stripe transformation is observed. Kerr imaging reveals that, under a low current pulse, the rapidly expanding stripes crowd out and annihilate the skyrmions before quickly decaying and leaving behind a sparse skyrmion population. Our findings establish an additional requirement of a minimum operating current density in the design of skyrmionic devices to avoid unintended skyrmion deletion. On the other hand, this skyrmion annihilation can also be strategically employed as a technique for skyrmion density control using solely current modulation in future skyrmionic devices. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Published version This work is supported by the Singapore National Research Foundation, Prime Minister’s Office under a Competitive Research Programme (Non-volatile Magnetic Logic and Memory Integrated Circuit Devices, NRF-CRP9-2011- 01), and an Industry-IHL Partnership Program (NRF2015- IIP001-001). The support from a RIE2020 ASTAR AME IAF-ICP Grant (No.I1801E0030) is also acknowledged. W.S.L. is a member of the SG-SPIN Consortium. 2021-01-07T05:26:49Z 2021-01-07T05:26:49Z 2020 Journal Article Ang, C. C. I., Gan, W., Wong, G. D. H., & Lew, W. S. (2020). Electrical control of skyrmion density via skyrmion-stripe transformation. Physical Review Applied, 14(5), 054048-. doi:10.1103/physrevapplied.14.054048 2331-7019 https://hdl.handle.net/10356/145764 10.1103/PhysRevApplied.14.054048 5 14 en NRF-CRP9-2011- 01 NRF2015- IIP001-001 I1801E0030 Physical Review Applied © 2020 American Physical Society (APS). All rights reserved. This paper was published in Physical Review Applied and is made available with permission of American Physical Society (APS). application/pdf |
| spellingShingle | Science::Physics Electrical Generation of Spin Carriers Magnetization Dynamics Ang, Calvin Ching Ian Gan, Weiliang Wong, Grayson Dao Hwee Lew, Wen Siang Electrical control of skyrmion density via skyrmion-stripe transformation |
| title | Electrical control of skyrmion density via skyrmion-stripe transformation |
| title_full | Electrical control of skyrmion density via skyrmion-stripe transformation |
| title_fullStr | Electrical control of skyrmion density via skyrmion-stripe transformation |
| title_full_unstemmed | Electrical control of skyrmion density via skyrmion-stripe transformation |
| title_short | Electrical control of skyrmion density via skyrmion-stripe transformation |
| title_sort | electrical control of skyrmion density via skyrmion stripe transformation |
| topic | Science::Physics Electrical Generation of Spin Carriers Magnetization Dynamics |
| url | https://hdl.handle.net/10356/145764 |
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