Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet
Although it is well documented that the vortex core in a micromagnet can switch polarization in response to magnetic field pulses, the temperature dependence of this process has not yet been addressed by experiments. Using scanning transmission x-ray microscopy, we investigate the magnetic vortex dy...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-12-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043429 |
| _version_ | 1797211125944680448 |
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| author | Einar Digernes Jonathan Leliaert Markus Weigand Erik Folven Bartel Van Waeyenberge |
| author_facet | Einar Digernes Jonathan Leliaert Markus Weigand Erik Folven Bartel Van Waeyenberge |
| author_sort | Einar Digernes |
| collection | DOAJ |
| description | Although it is well documented that the vortex core in a micromagnet can switch polarization in response to magnetic field pulses, the temperature dependence of this process has not yet been addressed by experiments. Using scanning transmission x-ray microscopy, we investigate the magnetic vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} microplatelet at temperatures ranging from 150K up to T_{C} at 350K. The time-resolved images reveal qualitatively different dynamic regimes as a function of temperature and applied field, as the relative strengths of the micromagnetic energy terms strongly vary over this temperature range. By explicitly accounting for the temperature dependence of the magnetic parameters in our micromagnetic simulations, we found excellent agreement with the experiments over the full measurement range. In line with previous models, the simulations reveal that the vortex core switches polarization when it reaches a critical velocity that mainly depends on the strength of the exchange interaction. It is therefore strongly temperature dependent, thus explaining our observation of the different dynamical regimes. |
| first_indexed | 2024-04-24T10:21:31Z |
| format | Article |
| id | doaj.art-533f6f26241144d89365598b37cc5a31 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:21:31Z |
| publishDate | 2020-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-533f6f26241144d89365598b37cc5a312024-04-12T17:05:48ZengAmerican Physical SocietyPhysical Review Research2643-15642020-12-012404342910.1103/PhysRevResearch.2.043429Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnetEinar DigernesJonathan LeliaertMarkus WeigandErik FolvenBartel Van WaeyenbergeAlthough it is well documented that the vortex core in a micromagnet can switch polarization in response to magnetic field pulses, the temperature dependence of this process has not yet been addressed by experiments. Using scanning transmission x-ray microscopy, we investigate the magnetic vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} microplatelet at temperatures ranging from 150K up to T_{C} at 350K. The time-resolved images reveal qualitatively different dynamic regimes as a function of temperature and applied field, as the relative strengths of the micromagnetic energy terms strongly vary over this temperature range. By explicitly accounting for the temperature dependence of the magnetic parameters in our micromagnetic simulations, we found excellent agreement with the experiments over the full measurement range. In line with previous models, the simulations reveal that the vortex core switches polarization when it reaches a critical velocity that mainly depends on the strength of the exchange interaction. It is therefore strongly temperature dependent, thus explaining our observation of the different dynamical regimes.http://doi.org/10.1103/PhysRevResearch.2.043429 |
| spellingShingle | Einar Digernes Jonathan Leliaert Markus Weigand Erik Folven Bartel Van Waeyenberge Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet Physical Review Research |
| title | Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet |
| title_full | Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet |
| title_fullStr | Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet |
| title_full_unstemmed | Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet |
| title_short | Direct observation of temperature dependent vortex dynamics in a La_{0.7}Sr_{0.3}MnO_{3} micromagnet |
| title_sort | direct observation of temperature dependent vortex dynamics in a la 0 7 sr 0 3 mno 3 micromagnet |
| url | http://doi.org/10.1103/PhysRevResearch.2.043429 |
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