Tailoring the energy landscape of a Bloch point singularity with curvature
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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2024
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| author | Ruiz-Gomez, Sandra Abert, Claas Morales-Fernández, Pamela Fernandez-Gonzalez, Claudia Koraltan, Sabri Danesi, Lukas Suess, Dieter Foerster, Michael Nino, Miguel Ángel Mandziak, Anna Wilgocka-Ślęzak, Dorota Nita, Pawel Koenig, Markus Seifert, Sebastian Rodríguez, Aurelio Hierro Fernández-Pacheco, Amalio Donnelly, Claire |
| author_facet | Ruiz-Gomez, Sandra Abert, Claas Morales-Fernández, Pamela Fernandez-Gonzalez, Claudia Koraltan, Sabri Danesi, Lukas Suess, Dieter Foerster, Michael Nino, Miguel Ángel Mandziak, Anna Wilgocka-Ślęzak, Dorota Nita, Pawel Koenig, Markus Seifert, Sebastian Rodríguez, Aurelio Hierro Fernández-Pacheco, Amalio Donnelly, Claire |
| contents | Topological defects, or singularities, play a key role in the statics and dynamics of complex systems. In magnetism, Bloch point singularities represent point defects that mediate the nucleation of textures such as skyrmions and hopfions. However, while the textures are typically stabilised in chiral magnets, the influence of chirality on the Bloch point singularities remains relatively unexplored. Here we harness advanced three-dimensional nanofabrication to explore the influence of chirality on Bloch point singularities by introducing curvature-induced symmetry breaking in a ferromagnetic nanowire. Combining X-ray magnetic microscopy with the application of in situ magnetic fields, we demonstrate that Bloch point singularity-containing domain walls are stabilised in straight regions of the sample, and determine that curvature can be used to tune the energy landscape of the Bloch points. Not only are we able to pattern pinning points but, by controlling the gradient of curvature, we define asymmetric potential wells to realise a robust Bloch point shift-register with non-reciprocal behaviour. These insights into the influence of symmetry and chirality on singularities offers a route to the controlled nucleation and propagation of topological textures, providing opportunities for logic and computing devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_06042 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tailoring the energy landscape of a Bloch point singularity with curvature Ruiz-Gomez, Sandra Abert, Claas Morales-Fernández, Pamela Fernandez-Gonzalez, Claudia Koraltan, Sabri Danesi, Lukas Suess, Dieter Foerster, Michael Nino, Miguel Ángel Mandziak, Anna Wilgocka-Ślęzak, Dorota Nita, Pawel Koenig, Markus Seifert, Sebastian Rodríguez, Aurelio Hierro Fernández-Pacheco, Amalio Donnelly, Claire Mesoscale and Nanoscale Physics Topological defects, or singularities, play a key role in the statics and dynamics of complex systems. In magnetism, Bloch point singularities represent point defects that mediate the nucleation of textures such as skyrmions and hopfions. However, while the textures are typically stabilised in chiral magnets, the influence of chirality on the Bloch point singularities remains relatively unexplored. Here we harness advanced three-dimensional nanofabrication to explore the influence of chirality on Bloch point singularities by introducing curvature-induced symmetry breaking in a ferromagnetic nanowire. Combining X-ray magnetic microscopy with the application of in situ magnetic fields, we demonstrate that Bloch point singularity-containing domain walls are stabilised in straight regions of the sample, and determine that curvature can be used to tune the energy landscape of the Bloch points. Not only are we able to pattern pinning points but, by controlling the gradient of curvature, we define asymmetric potential wells to realise a robust Bloch point shift-register with non-reciprocal behaviour. These insights into the influence of symmetry and chirality on singularities offers a route to the controlled nucleation and propagation of topological textures, providing opportunities for logic and computing devices. |
| title | Tailoring the energy landscape of a Bloch point singularity with curvature |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.06042 |