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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
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2026
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2604.02824 |
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| author | Stellhorn, Annika Palma, Juan G. C. Backs, Alicia Bergman, Anders Klautau, Angela B. Kentzinger, Emmanuel Bednarski-Meinke, Connie Tober, Steffen Blackburn, Elizabeth Barthel, Juri Steinke, Nina-Juliane Petrilli, Helena M. Miranda, Ivan P. |
| author_facet | Stellhorn, Annika Palma, Juan G. C. Backs, Alicia Bergman, Anders Klautau, Angela B. Kentzinger, Emmanuel Bednarski-Meinke, Connie Tober, Steffen Blackburn, Elizabeth Barthel, Juri Steinke, Nina-Juliane Petrilli, Helena M. Miranda, Ivan P. |
| contents | Chirality in superconductor-ferromagnet hybrids strongly influences phenomena such as the observable signatures of long-range triplet superconductivity, but its microscopic origin in nominally centrosymmetric ferromagnets is still unclear. Here, we combine structural characterization, polarization-analyzed grazing-incidence small-angle neutron scattering (PA-GISANS), first-principles calculations, and deep-learning-assisted multiscale modeling to study FePd and Nb/FePd heterostructures. Experimentally, we observe partial L1$_0$ order, atomic intermixing, anti-phase boundaries, and a depth-dependent defect gradient across the FePd layer, together with a finite net magnetic chirality at room temperature. The GISANS asymmetry indicates that the main chiral contribution lies in-plane, with an additional out-of-plane component associated with depth-dependent magnetic inhomogeneity. Theoretically, we show that chemical disorder in FePd, especially when combined with a compositional gradient, produces finite Dzyaloshinskii-Moriya interactions and stabilizes chiral finite-$\mathbf{q}$ magnetic modulations with mixed Bloch-Néel character. In the mesoscopic model, the resulting in-plane modulation length approaches the experimentally observed range. These results identify disorder and compositional gradients as intrinsic microscopic sources of net chirality in FePd-based films, showing that the observed chirality does not arise only from interface effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02824 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Disorder-induced chirality in superconductor-ferromagnet heterostructures revealed by neutron scattering and multiscale modeling Stellhorn, Annika Palma, Juan G. C. Backs, Alicia Bergman, Anders Klautau, Angela B. Kentzinger, Emmanuel Bednarski-Meinke, Connie Tober, Steffen Blackburn, Elizabeth Barthel, Juri Steinke, Nina-Juliane Petrilli, Helena M. Miranda, Ivan P. Materials Science Chirality in superconductor-ferromagnet hybrids strongly influences phenomena such as the observable signatures of long-range triplet superconductivity, but its microscopic origin in nominally centrosymmetric ferromagnets is still unclear. Here, we combine structural characterization, polarization-analyzed grazing-incidence small-angle neutron scattering (PA-GISANS), first-principles calculations, and deep-learning-assisted multiscale modeling to study FePd and Nb/FePd heterostructures. Experimentally, we observe partial L1$_0$ order, atomic intermixing, anti-phase boundaries, and a depth-dependent defect gradient across the FePd layer, together with a finite net magnetic chirality at room temperature. The GISANS asymmetry indicates that the main chiral contribution lies in-plane, with an additional out-of-plane component associated with depth-dependent magnetic inhomogeneity. Theoretically, we show that chemical disorder in FePd, especially when combined with a compositional gradient, produces finite Dzyaloshinskii-Moriya interactions and stabilizes chiral finite-$\mathbf{q}$ magnetic modulations with mixed Bloch-Néel character. In the mesoscopic model, the resulting in-plane modulation length approaches the experimentally observed range. These results identify disorder and compositional gradients as intrinsic microscopic sources of net chirality in FePd-based films, showing that the observed chirality does not arise only from interface effects. |
| title | Disorder-induced chirality in superconductor-ferromagnet heterostructures revealed by neutron scattering and multiscale modeling |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.02824 |