Control of helix orientation in chiral magnets via lateral confinement
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866908783452618752 |
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| author | Colling, Maurice Stepanova, Mariia Hentschel, Mario Bhattacharjee, Somasree Lysne, Erik Hunnestad, Kasper Kanazawa, Naoya Tokura, Yoshinori Masell, Jan Meier, Dennis |
| author_facet | Colling, Maurice Stepanova, Mariia Hentschel, Mario Bhattacharjee, Somasree Lysne, Erik Hunnestad, Kasper Kanazawa, Naoya Tokura, Yoshinori Masell, Jan Meier, Dennis |
| contents | Helimagnetic materials offer a versatile platform for spin-based device concepts owing to their long-range, tunable spiral order. Here, we demonstrate controlled manipulation of the helimagnetic propagation vector q by geometrical confinement, using FeGe as a model DMI-driven chiral magnet. Micromagnetic simulations based on the nonlinear sigma model reveal that open boundaries give rise to a chiral surface twist acting as an effective surface anisotropy, which dictates the preferred helix orientation in the absence of magnetostatic shape effects. This geometry-induced anisotropy is quantitatively captured by an analytical model derived from the DMI boundary condition. Magnetic force microscopy measurements on focused-ion-beam structured FeGe confirm the predicted orientation behavior and establish geometry-controlled helimagnetic order as a robust, tunable mechanism for steering DMI-stabilized spin-spiral states. The concept provides a general route toward device-level control of chiral magnetic order in of non-centrosymmetric systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16704 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Control of helix orientation in chiral magnets via lateral confinement Colling, Maurice Stepanova, Mariia Hentschel, Mario Bhattacharjee, Somasree Lysne, Erik Hunnestad, Kasper Kanazawa, Naoya Tokura, Yoshinori Masell, Jan Meier, Dennis Materials Science Helimagnetic materials offer a versatile platform for spin-based device concepts owing to their long-range, tunable spiral order. Here, we demonstrate controlled manipulation of the helimagnetic propagation vector q by geometrical confinement, using FeGe as a model DMI-driven chiral magnet. Micromagnetic simulations based on the nonlinear sigma model reveal that open boundaries give rise to a chiral surface twist acting as an effective surface anisotropy, which dictates the preferred helix orientation in the absence of magnetostatic shape effects. This geometry-induced anisotropy is quantitatively captured by an analytical model derived from the DMI boundary condition. Magnetic force microscopy measurements on focused-ion-beam structured FeGe confirm the predicted orientation behavior and establish geometry-controlled helimagnetic order as a robust, tunable mechanism for steering DMI-stabilized spin-spiral states. The concept provides a general route toward device-level control of chiral magnetic order in of non-centrosymmetric systems. |
| title | Control of helix orientation in chiral magnets via lateral confinement |
| topic | Materials Science |
| url | https://arxiv.org/abs/2601.16704 |