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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2502.13324 |
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| _version_ | 1866912521789636608 |
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| author | Giri, Bharat Ullah, Ahsan Li, Jing Josteinsson, Bjorn Xu, Zhewen Lamichhane, Suvechhya Erickson, Adam Subedi, Arjun Dowben, Peter A Hellmann, Gabriel Puebla Laraoui, Abdelghani Liou, Sy-Hwang Xu, Xiaoshan |
| author_facet | Giri, Bharat Ullah, Ahsan Li, Jing Josteinsson, Bjorn Xu, Zhewen Lamichhane, Suvechhya Erickson, Adam Subedi, Arjun Dowben, Peter A Hellmann, Gabriel Puebla Laraoui, Abdelghani Liou, Sy-Hwang Xu, Xiaoshan |
| contents | Topological Hall effect (THE), a quantum phenomenon arising from emergent magnetic field generated by topological spin texture, is a key method for detecting non-coplanar spin structures like skyrmions in magnetic materials. Here, we investigate a bilayer structure of Pt and conducting ferrimagnet NiCo2O4 (NCO) of perpendicular magnetic anisotropy and demonstrate giant THE across a temperature range 2 - 350 K. The absence of THE in single-layer Pt and NCO, as well as in Pt/Cu/NCO, suggests its interfacial origin. The maximum THE occurring just before the NCO coercive field indicates its connection to magnetic nucleation centers, which are topologically equivalent to skyrmions. The large normalized THE, based on the emergent-field model, points to a high population density of small nucleation centers. This aligns with the unresolvable domain structures during magnetization reversal, even though clear domain structures are detected after zero-field cooling. These results establish heavy metal/NCO as a promising system for exploring topological spin structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_13324 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Giant Topological Hall Effect Across Wide Temperature in Pt/NiCo2O4 Heterostructure Giri, Bharat Ullah, Ahsan Li, Jing Josteinsson, Bjorn Xu, Zhewen Lamichhane, Suvechhya Erickson, Adam Subedi, Arjun Dowben, Peter A Hellmann, Gabriel Puebla Laraoui, Abdelghani Liou, Sy-Hwang Xu, Xiaoshan Materials Science Topological Hall effect (THE), a quantum phenomenon arising from emergent magnetic field generated by topological spin texture, is a key method for detecting non-coplanar spin structures like skyrmions in magnetic materials. Here, we investigate a bilayer structure of Pt and conducting ferrimagnet NiCo2O4 (NCO) of perpendicular magnetic anisotropy and demonstrate giant THE across a temperature range 2 - 350 K. The absence of THE in single-layer Pt and NCO, as well as in Pt/Cu/NCO, suggests its interfacial origin. The maximum THE occurring just before the NCO coercive field indicates its connection to magnetic nucleation centers, which are topologically equivalent to skyrmions. The large normalized THE, based on the emergent-field model, points to a high population density of small nucleation centers. This aligns with the unresolvable domain structures during magnetization reversal, even though clear domain structures are detected after zero-field cooling. These results establish heavy metal/NCO as a promising system for exploring topological spin structures. |
| title | Giant Topological Hall Effect Across Wide Temperature in Pt/NiCo2O4 Heterostructure |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.13324 |