Magnetization reversal mechanism of double-helix nanowires probed by dark-field magneto-optical Kerr effect
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| Format: | Preprint |
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2026
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| _version_ | 1866911372274565120 |
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| author | Gokita, Takeaki Jurczyk, Jakub Leo, Naëmi Koraltan, Sabri Anadón, Alberto Cascales-Sandoval, Miguel Ángel Belkhou, Rachid Abert, Claas Suess, Dieter Donnelly, Claire Fernández-Pacheco, Amalio |
| author_facet | Gokita, Takeaki Jurczyk, Jakub Leo, Naëmi Koraltan, Sabri Anadón, Alberto Cascales-Sandoval, Miguel Ángel Belkhou, Rachid Abert, Claas Suess, Dieter Donnelly, Claire Fernández-Pacheco, Amalio |
| contents | Double-helix (DH) nanowires provide a platform to study the influence of geometric chirality on spin chirality. Their three-dimensional (3D) helical architecture and tunable inter-strand coupling enable control of spin chirality, including the stabilization of topological 3D magnetic states such as helical domains and domain walls, topological stray fields, and extended helical vortex/skyrmion tubes. So far, the study of these and other 3D nanostructures is usually confined to a limited number of magnetic microscopy experiments in large facilities. Here, we investigate the reversal mechanism of a single DH nanowire using Dark-Field magneto-optical Kerr effect (DF-MOKE) magnetometry under external 3D magnetic fields. By analyzing the angular dependence of the DF-MOKE signal, we fit the reversal process using established models for domain-wall nucleation and propagation, finding a characteristic behavior similar to that reported for cylindrical nanowires. Micromagnetic simulations indicate that the reversal process goes through nucleation of the helical vortex tube in a curling manner while ptychographic X-ray magnetic circular dichroism data reveal that this helical vortex tube state forms through a mixed nucleation-propagation process. These observations provide a consistent microscopic picture of reversal mediated by a helical vortex tube extending along the nanowire. Our work provides a comprehensive characterization of magnetization reversal in DH nanowires and demonstrates that DF-MOKE magnetometry is effective for probing reversal mechanisms in single 3D nanostructures. This lab-based approach expands the range of accessible experiments beyond large-scale facilities, enabling extensive exploration of the rich spin states supported by 3D nano-geometries. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_08613 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetization reversal mechanism of double-helix nanowires probed by dark-field magneto-optical Kerr effect Gokita, Takeaki Jurczyk, Jakub Leo, Naëmi Koraltan, Sabri Anadón, Alberto Cascales-Sandoval, Miguel Ángel Belkhou, Rachid Abert, Claas Suess, Dieter Donnelly, Claire Fernández-Pacheco, Amalio Mesoscale and Nanoscale Physics Double-helix (DH) nanowires provide a platform to study the influence of geometric chirality on spin chirality. Their three-dimensional (3D) helical architecture and tunable inter-strand coupling enable control of spin chirality, including the stabilization of topological 3D magnetic states such as helical domains and domain walls, topological stray fields, and extended helical vortex/skyrmion tubes. So far, the study of these and other 3D nanostructures is usually confined to a limited number of magnetic microscopy experiments in large facilities. Here, we investigate the reversal mechanism of a single DH nanowire using Dark-Field magneto-optical Kerr effect (DF-MOKE) magnetometry under external 3D magnetic fields. By analyzing the angular dependence of the DF-MOKE signal, we fit the reversal process using established models for domain-wall nucleation and propagation, finding a characteristic behavior similar to that reported for cylindrical nanowires. Micromagnetic simulations indicate that the reversal process goes through nucleation of the helical vortex tube in a curling manner while ptychographic X-ray magnetic circular dichroism data reveal that this helical vortex tube state forms through a mixed nucleation-propagation process. These observations provide a consistent microscopic picture of reversal mediated by a helical vortex tube extending along the nanowire. Our work provides a comprehensive characterization of magnetization reversal in DH nanowires and demonstrates that DF-MOKE magnetometry is effective for probing reversal mechanisms in single 3D nanostructures. This lab-based approach expands the range of accessible experiments beyond large-scale facilities, enabling extensive exploration of the rich spin states supported by 3D nano-geometries. |
| title | Magnetization reversal mechanism of double-helix nanowires probed by dark-field magneto-optical Kerr effect |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2601.08613 |