Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866913170036097024 |
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| author | Leo, Naëmi Wolf, Daniel Alonso, Alicia Estela Herguedas Zaiets, Oleksandr Jurczyk, Jakub Gokita, Takeaki Fullerton, John Sanz-Hernandez, Dedalo Donnelly, Claire Sorrentino, Andrea Pereiro, Eva Aballe, Lucia Fischer, Peter Belkhou, Rachid Abert, Claas Suess, Dieter Lubk, Axel Hierro-Rodriguez, Aurelio Fernández-Pacheco, Amalio |
| author_facet | Leo, Naëmi Wolf, Daniel Alonso, Alicia Estela Herguedas Zaiets, Oleksandr Jurczyk, Jakub Gokita, Takeaki Fullerton, John Sanz-Hernandez, Dedalo Donnelly, Claire Sorrentino, Andrea Pereiro, Eva Aballe, Lucia Fischer, Peter Belkhou, Rachid Abert, Claas Suess, Dieter Lubk, Axel Hierro-Rodriguez, Aurelio Fernández-Pacheco, Amalio |
| contents | Bloch points are three-dimensional topological singularities in magnetization that play a key role in topological transformations of spin textures, such as skyrmion creation or annihilation. While topology often enforces the existence of Bloch points in confined geometries like cylindrical nanowires, deterministic control over their position and magnetic configuration remains challenging. Here we demonstrate the generation of Bloch points with controlled spin texture by engineering geometrical boundary conditions in three-dimensional nanomagnets. By introducing a chirality interface between two three-dimensional double-helix nanowires of opposite handedness, forming a kinked, non-collinear structure, we impose competing topological constraints that uniquely define the magnetization configuration surrounding the Bloch point. A saturating magnetic field nucleates head-to-head or tail-to-tail domain configurations at the chirality interface, producing a Bloch-point domain wall with deterministic polarity, circulation and helicity. This geometrical approach enables full three-dimensional control of Bloch point domain walls allowing deterministic engineering of their spin texture and its selective coupling to current-induced Oersted fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_29672 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions Leo, Naëmi Wolf, Daniel Alonso, Alicia Estela Herguedas Zaiets, Oleksandr Jurczyk, Jakub Gokita, Takeaki Fullerton, John Sanz-Hernandez, Dedalo Donnelly, Claire Sorrentino, Andrea Pereiro, Eva Aballe, Lucia Fischer, Peter Belkhou, Rachid Abert, Claas Suess, Dieter Lubk, Axel Hierro-Rodriguez, Aurelio Fernández-Pacheco, Amalio Mesoscale and Nanoscale Physics Bloch points are three-dimensional topological singularities in magnetization that play a key role in topological transformations of spin textures, such as skyrmion creation or annihilation. While topology often enforces the existence of Bloch points in confined geometries like cylindrical nanowires, deterministic control over their position and magnetic configuration remains challenging. Here we demonstrate the generation of Bloch points with controlled spin texture by engineering geometrical boundary conditions in three-dimensional nanomagnets. By introducing a chirality interface between two three-dimensional double-helix nanowires of opposite handedness, forming a kinked, non-collinear structure, we impose competing topological constraints that uniquely define the magnetization configuration surrounding the Bloch point. A saturating magnetic field nucleates head-to-head or tail-to-tail domain configurations at the chirality interface, producing a Bloch-point domain wall with deterministic polarity, circulation and helicity. This geometrical approach enables full three-dimensional control of Bloch point domain walls allowing deterministic engineering of their spin texture and its selective coupling to current-induced Oersted fields. |
| title | Generation of Bloch Points with Controlled Spin Texture Using Geometrical Boundary Conditions |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.29672 |