Bloch point dynamics in exchange-spring heterostructures
Magnetization textures that are stabilized by topological constraints, such as skyrmions and chiral bobbers, as well as the emergent electrodynamics associated with their motion, provide a promising avenue toward novel energy-efficient nanomagnetic devices. Here, it is shown that exchange-spring-typ...
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2022-07-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0097610 |
| _version_ | 1811320355067789312 |
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| author | Michalis Charilaou |
| author_facet | Michalis Charilaou |
| author_sort | Michalis Charilaou |
| collection | DOAJ |
| description | Magnetization textures that are stabilized by topological constraints, such as skyrmions and chiral bobbers, as well as the emergent electrodynamics associated with their motion, provide a promising avenue toward novel energy-efficient nanomagnetic devices. Here, it is shown that exchange-spring-type heterostructures, where soft ferromagnets with azimuthal symmetry are exchange-coupled to a ferromagnetic layer with perpendicular magnetic anisotropy, can be used for the creation and control of skyrmion tubes and Bloch points during magnetization reversal of the soft ferromagnet, where the rapid motion of the Bloch points induces an emergent electric field with a magnitude of the order of megavolts per meter. The exchange coupling to the hard ferromagnet restores the system to its original configuration, making the process fully reversible and repeatable, and the duration of the magnetization processes and the motion of the Bloch points can be tuned by adjusting the size of the ferromagnet. Based on these numerical predictions, it is proposed that exchange-spring heterostructures could be used to generate picosecond electromagnetic pulses. |
| first_indexed | 2024-04-13T12:57:19Z |
| format | Article |
| id | doaj.art-10bd67e95e4f4911a2d7c02015f05429 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-04-13T12:57:19Z |
| publishDate | 2022-07-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-10bd67e95e4f4911a2d7c02015f054292022-12-22T02:46:00ZengAIP Publishing LLCAPL Materials2166-532X2022-07-01107071103071103-710.1063/5.0097610Bloch point dynamics in exchange-spring heterostructuresMichalis Charilaou0Department of Physics, University of Louisiana at Lafayette, Lafayette, Louisiana 70504, USAMagnetization textures that are stabilized by topological constraints, such as skyrmions and chiral bobbers, as well as the emergent electrodynamics associated with their motion, provide a promising avenue toward novel energy-efficient nanomagnetic devices. Here, it is shown that exchange-spring-type heterostructures, where soft ferromagnets with azimuthal symmetry are exchange-coupled to a ferromagnetic layer with perpendicular magnetic anisotropy, can be used for the creation and control of skyrmion tubes and Bloch points during magnetization reversal of the soft ferromagnet, where the rapid motion of the Bloch points induces an emergent electric field with a magnitude of the order of megavolts per meter. The exchange coupling to the hard ferromagnet restores the system to its original configuration, making the process fully reversible and repeatable, and the duration of the magnetization processes and the motion of the Bloch points can be tuned by adjusting the size of the ferromagnet. Based on these numerical predictions, it is proposed that exchange-spring heterostructures could be used to generate picosecond electromagnetic pulses.http://dx.doi.org/10.1063/5.0097610 |
| spellingShingle | Michalis Charilaou Bloch point dynamics in exchange-spring heterostructures APL Materials |
| title | Bloch point dynamics in exchange-spring heterostructures |
| title_full | Bloch point dynamics in exchange-spring heterostructures |
| title_fullStr | Bloch point dynamics in exchange-spring heterostructures |
| title_full_unstemmed | Bloch point dynamics in exchange-spring heterostructures |
| title_short | Bloch point dynamics in exchange-spring heterostructures |
| title_sort | bloch point dynamics in exchange spring heterostructures |
| url | http://dx.doi.org/10.1063/5.0097610 |
| work_keys_str_mv | AT michalischarilaou blochpointdynamicsinexchangespringheterostructures |