Higher-order Hall response arises from octupole order and scalar spin chirality in a noncollinear antiferromagnet
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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866915785241264128 |
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| author | Rajan, Adithya Saunderson, Tom G. Lux, Fabian R. Díaz, Rocío Yanes Abdullah, Hasan M. Bose, Arnab Bednarz, Beatrice Kim, Jun-Young Go, Dongwook Hajiri, Tetsuya Shukla, Gokaran Gomonay, Olena Yao, Yugui Feng, Wanxiang Asano, Hidefumi Schwingenschlögl, Udo López-Díaz, Luis Sinova, Jairo Jakob, Gerhard Mokrousov, Yuriy Manchon, Aurélien Kläui, Mathias |
| author_facet | Rajan, Adithya Saunderson, Tom G. Lux, Fabian R. Díaz, Rocío Yanes Abdullah, Hasan M. Bose, Arnab Bednarz, Beatrice Kim, Jun-Young Go, Dongwook Hajiri, Tetsuya Shukla, Gokaran Gomonay, Olena Yao, Yugui Feng, Wanxiang Asano, Hidefumi Schwingenschlögl, Udo López-Díaz, Luis Sinova, Jairo Jakob, Gerhard Mokrousov, Yuriy Manchon, Aurélien Kläui, Mathias |
| contents | Noncollinear antiferromagnets can generate a transverse electrical response known as the anomalous Hall effect, even though they possess almost no net magnetization. The microscopic origin of this behaviour, however, has remained unclear because conventional measurement geometries mix different contributions to the measured response. Here, we show that applying magnetic fields in selected in-plane directions allows us to disentangle the mechanisms underlying the Hall effect in a representative noncollinear antiferromagnet. By suppressing any dipole-related signal, we isolate a purely octupole-driven Hall response that exhibits a characteristic three-fold angular symmetry. At low magnetic fields, we further observe an additional Hall-like contribution that arises from the scalar spin chirality associated with noncoplanar spin textures. Combining symmetry analysis, first-principles calculations, and transport measurements, we reveal that octupole order, dipole moments, and chirality coexist and contribute in distinct field regimes. These findings establish a framework for identifying and controlling complex magnetic order parameters for spintronic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_10747 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Higher-order Hall response arises from octupole order and scalar spin chirality in a noncollinear antiferromagnet Rajan, Adithya Saunderson, Tom G. Lux, Fabian R. Díaz, Rocío Yanes Abdullah, Hasan M. Bose, Arnab Bednarz, Beatrice Kim, Jun-Young Go, Dongwook Hajiri, Tetsuya Shukla, Gokaran Gomonay, Olena Yao, Yugui Feng, Wanxiang Asano, Hidefumi Schwingenschlögl, Udo López-Díaz, Luis Sinova, Jairo Jakob, Gerhard Mokrousov, Yuriy Manchon, Aurélien Kläui, Mathias Mesoscale and Nanoscale Physics Noncollinear antiferromagnets can generate a transverse electrical response known as the anomalous Hall effect, even though they possess almost no net magnetization. The microscopic origin of this behaviour, however, has remained unclear because conventional measurement geometries mix different contributions to the measured response. Here, we show that applying magnetic fields in selected in-plane directions allows us to disentangle the mechanisms underlying the Hall effect in a representative noncollinear antiferromagnet. By suppressing any dipole-related signal, we isolate a purely octupole-driven Hall response that exhibits a characteristic three-fold angular symmetry. At low magnetic fields, we further observe an additional Hall-like contribution that arises from the scalar spin chirality associated with noncoplanar spin textures. Combining symmetry analysis, first-principles calculations, and transport measurements, we reveal that octupole order, dipole moments, and chirality coexist and contribute in distinct field regimes. These findings establish a framework for identifying and controlling complex magnetic order parameters for spintronic applications. |
| title | Higher-order Hall response arises from octupole order and scalar spin chirality in a noncollinear antiferromagnet |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2304.10747 |