Designing Spin-driven Multiferroics in Altermagnets
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866909443887726592 |
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| author | Cao, Ranquan Dong, Ruizhi Fei, Ruixiang Yao, Yugui |
| author_facet | Cao, Ranquan Dong, Ruizhi Fei, Ruixiang Yao, Yugui |
| contents | Spin-driven multiferroics exhibit strong magnetoelectric coupling, with notable polarization changes under a magnetic field, but these effects are usually limited to high-Z magnetic insulators with low electronic polarization. In this work, we introduce altermagnets as a promising platform for achieving strong magnetoelectric coupling in low-Z systems with substantial polarization. This large polarization arises from a design principle that utilizes the Heisenberg-like exchange striction mechanism, eliminating the reliance on spin-orbit coupling (SOC). This approach enables the Kramers-degenerate antiferromagnetic phase derived from altermagnetic insulators to achieve substantial polarization without spin splitting, providing a flexible platform for regulating spin-splitting phenomena. Through first-principles simulations and an effective Landau-Ginzburg Hamiltonian, we demonstrate that materials in the LiMnO2 family and strained RuF4 family can achieve polarization values exceeding 1.0 μC/cm2, an order of magnitude larger than those found in SOC-driven multiferroics. Moreover, their magnetoelectric coupling is one to two orders of magnitude stronger than that observed in conventional multiferroics and those driven by SOC. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_20347 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Designing Spin-driven Multiferroics in Altermagnets Cao, Ranquan Dong, Ruizhi Fei, Ruixiang Yao, Yugui Materials Science Mesoscale and Nanoscale Physics Spin-driven multiferroics exhibit strong magnetoelectric coupling, with notable polarization changes under a magnetic field, but these effects are usually limited to high-Z magnetic insulators with low electronic polarization. In this work, we introduce altermagnets as a promising platform for achieving strong magnetoelectric coupling in low-Z systems with substantial polarization. This large polarization arises from a design principle that utilizes the Heisenberg-like exchange striction mechanism, eliminating the reliance on spin-orbit coupling (SOC). This approach enables the Kramers-degenerate antiferromagnetic phase derived from altermagnetic insulators to achieve substantial polarization without spin splitting, providing a flexible platform for regulating spin-splitting phenomena. Through first-principles simulations and an effective Landau-Ginzburg Hamiltonian, we demonstrate that materials in the LiMnO2 family and strained RuF4 family can achieve polarization values exceeding 1.0 μC/cm2, an order of magnitude larger than those found in SOC-driven multiferroics. Moreover, their magnetoelectric coupling is one to two orders of magnitude stronger than that observed in conventional multiferroics and those driven by SOC. |
| title | Designing Spin-driven Multiferroics in Altermagnets |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2412.20347 |