Dzyaloshinskii-Moriya interaction chirality reversal with ferromagnetic thickness
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917268514930688 |
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| author | Gueneau, Capucine Ibrahim, Fatima Fischer, Johanna Vojáček, Libor Fillion, Charles-Élie Pizzini, Stefania Ranno, Laurent Joumard, Isabelle Auffret, Stéphane Faure-Vincent, Jérôme Baraduc, Claire Chshiev, Mairbek Béa, Hélène |
| author_facet | Gueneau, Capucine Ibrahim, Fatima Fischer, Johanna Vojáček, Libor Fillion, Charles-Élie Pizzini, Stefania Ranno, Laurent Joumard, Isabelle Auffret, Stéphane Faure-Vincent, Jérôme Baraduc, Claire Chshiev, Mairbek Béa, Hélène |
| contents | In ultrathin ferromagnetic films sandwiched between two distinct heavy metal layers or between a heavy metal and an oxide layer, the Dzyaloshinskii-Moriya interaction (DMI) is of interfacial origin. Its chirality and strength are determined by the properties of the adjacent heavy metals and the degree of oxidation at the interfaces. Here, we demonstrate that the DMI chirality can change solely with variations in the thickness of the ferromagnetic layer - an effect that has not been experimentally studied in details or explained until now. Our experimental observation in the trilayer system Ta/FeCoB/TaOx is supported by ab initio calculations: they reveal that variations in orbital filling and inter-atomic distances at the interface, driven by the structural relaxations in the ultrathin regime, lead to an inversion of DMI chirality. We hence propose a new degree of freedom to tune DMI chirality and the associated chiral spin textures by tailoring crystal structure e.g. using strain or surface acoustic waves. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_12098 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dzyaloshinskii-Moriya interaction chirality reversal with ferromagnetic thickness Gueneau, Capucine Ibrahim, Fatima Fischer, Johanna Vojáček, Libor Fillion, Charles-Élie Pizzini, Stefania Ranno, Laurent Joumard, Isabelle Auffret, Stéphane Faure-Vincent, Jérôme Baraduc, Claire Chshiev, Mairbek Béa, Hélène Materials Science In ultrathin ferromagnetic films sandwiched between two distinct heavy metal layers or between a heavy metal and an oxide layer, the Dzyaloshinskii-Moriya interaction (DMI) is of interfacial origin. Its chirality and strength are determined by the properties of the adjacent heavy metals and the degree of oxidation at the interfaces. Here, we demonstrate that the DMI chirality can change solely with variations in the thickness of the ferromagnetic layer - an effect that has not been experimentally studied in details or explained until now. Our experimental observation in the trilayer system Ta/FeCoB/TaOx is supported by ab initio calculations: they reveal that variations in orbital filling and inter-atomic distances at the interface, driven by the structural relaxations in the ultrathin regime, lead to an inversion of DMI chirality. We hence propose a new degree of freedom to tune DMI chirality and the associated chiral spin textures by tailoring crystal structure e.g. using strain or surface acoustic waves. |
| title | Dzyaloshinskii-Moriya interaction chirality reversal with ferromagnetic thickness |
| topic | Materials Science |
| url | https://arxiv.org/abs/2501.12098 |