Trilinear coupling and toroidicity in multiferroics
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912301624328192 |
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| author | Urru, Andrea Filippetti, Alessio Íñiguez-Gonzàlez, Jorge Fiorentini, Vincenzo |
| author_facet | Urru, Andrea Filippetti, Alessio Íñiguez-Gonzàlez, Jorge Fiorentini, Vincenzo |
| contents | Magnetoelectric responses are related in general to magnetic multipoles, and in particular the off-diagonal linear response is proportional to the toroidization order parameter. In multiferroics with three order parameters (polarization, magnetization, and toroidization), such response turns out to be also proportional to the trilinear coupling between the order parameters. Here we explore this scenario, discussing the effects of such trilinear coupling within a Landau theory framework, and using ab initio calculations to discuss a specific model system for this effect, namely the recently predicted three-order-parameter multiferroic metal Bi$_5$Mn$_5$O$_{17}$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_11939 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Trilinear coupling and toroidicity in multiferroics Urru, Andrea Filippetti, Alessio Íñiguez-Gonzàlez, Jorge Fiorentini, Vincenzo Materials Science Computational Physics Magnetoelectric responses are related in general to magnetic multipoles, and in particular the off-diagonal linear response is proportional to the toroidization order parameter. In multiferroics with three order parameters (polarization, magnetization, and toroidization), such response turns out to be also proportional to the trilinear coupling between the order parameters. Here we explore this scenario, discussing the effects of such trilinear coupling within a Landau theory framework, and using ab initio calculations to discuss a specific model system for this effect, namely the recently predicted three-order-parameter multiferroic metal Bi$_5$Mn$_5$O$_{17}$. |
| title | Trilinear coupling and toroidicity in multiferroics |
| topic | Materials Science Computational Physics |
| url | https://arxiv.org/abs/2503.11939 |