Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator
Abstract Micromagnetic simulations are used to study a spin-torque vortex oscillator excited by an out-of-plane dc current. The vortex core gyration amplitude is confined between two orbits due to periodical vortex core polarity reversals. The upper limit corresponds to the orbit where the vortex co...
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Nature Portfolio
2024-10-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-024-74094-0 |
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| author | Chloé Chopin Simon de Wergifosse Anatole Moureaux Flavio Abreu Araujo |
| author_facet | Chloé Chopin Simon de Wergifosse Anatole Moureaux Flavio Abreu Araujo |
| author_sort | Chloé Chopin |
| collection | DOAJ |
| description | Abstract Micromagnetic simulations are used to study a spin-torque vortex oscillator excited by an out-of-plane dc current. The vortex core gyration amplitude is confined between two orbits due to periodical vortex core polarity reversals. The upper limit corresponds to the orbit where the vortex core reaches its critical velocity triggering the first polarity reversal which is immediately followed by a second one. After this double polarity reversal, the vortex core is on a smaller orbit that defines the lower limit of the vortex core gyration amplitude. This double reversal process is a periodic phenomenon and its frequency, as well as the upper and lower limit of the vortex core gyration, is controlled by the input current density while the vortex chirality determines the apparition of this confinement regime. In this non-linear regime, the vortex core never reaches a stable orbit and thus, it can be of interest for neuromorphic application as a leaky integrate-and-fire neuron for example. |
| format | Article |
| id | doaj-art-3a2d0097a7bb4aa3a33b9dc35a2ba422 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-3a2d0097a7bb4aa3a33b9dc35a2ba4222025-08-20T02:17:45ZengNature PortfolioScientific Reports2045-23222024-10-011411610.1038/s41598-024-74094-0Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillatorChloé Chopin0Simon de Wergifosse1Anatole Moureaux2Flavio Abreu Araujo3Institute of Condensed Matter and Nanosciences, Université catholique de LouvainInstitute of Condensed Matter and Nanosciences, Université catholique de LouvainInstitute of Condensed Matter and Nanosciences, Université catholique de LouvainInstitute of Condensed Matter and Nanosciences, Université catholique de LouvainAbstract Micromagnetic simulations are used to study a spin-torque vortex oscillator excited by an out-of-plane dc current. The vortex core gyration amplitude is confined between two orbits due to periodical vortex core polarity reversals. The upper limit corresponds to the orbit where the vortex core reaches its critical velocity triggering the first polarity reversal which is immediately followed by a second one. After this double polarity reversal, the vortex core is on a smaller orbit that defines the lower limit of the vortex core gyration amplitude. This double reversal process is a periodic phenomenon and its frequency, as well as the upper and lower limit of the vortex core gyration, is controlled by the input current density while the vortex chirality determines the apparition of this confinement regime. In this non-linear regime, the vortex core never reaches a stable orbit and thus, it can be of interest for neuromorphic application as a leaky integrate-and-fire neuron for example.https://doi.org/10.1038/s41598-024-74094-0 |
| spellingShingle | Chloé Chopin Simon de Wergifosse Anatole Moureaux Flavio Abreu Araujo Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator Scientific Reports |
| title | Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator |
| title_full | Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator |
| title_fullStr | Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator |
| title_full_unstemmed | Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator |
| title_short | Current-controlled periodic double-polarity reversals in a spin-torque vortex oscillator |
| title_sort | current controlled periodic double polarity reversals in a spin torque vortex oscillator |
| url | https://doi.org/10.1038/s41598-024-74094-0 |
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