Strain-Driven Altermagnetic Spin Splitting Effect in RuO$_2$
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arXiv
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| Format: | Preprint |
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2026
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| author | Lee, Seungjun Jeong, Seung Gyo Wang, Jian-Ping Jalan, Bharat Low, Tony |
| author_facet | Lee, Seungjun Jeong, Seung Gyo Wang, Jian-Ping Jalan, Bharat Low, Tony |
| contents | The non-relativistic spin-momentum locking in altermagnets gives rise to a time-reversal-odd spin Hall effect, known as the altermagnetic spin-splitting effect (ASSE). Although ASSE was first reported in RuO$_2$, subsequent experiments have yielded inconsistent results, leaving its spin-transport mechanism unclear. Here, we systematically investigate how strain, crystal orientation, and the Hubbard $U$ parameter influence the magnetic ground state and spin Hall response of RuO$_2$. Guided by recent experimental observations, we find that $U$ is likely smaller than the value required to induce intrinsic magnetism, suggesting that bulk RuO$_2$ and (001)/(101) RuO$_2$ thin films grown on TiO$_2$ are nonmagnetic in the absence of extrinsic effects. In contrast, (100) and (110) films exhibit strain-induced altermagnetic spin splitting, leading to a strong ASSE even without Hubbard $U$ corrections. These results reconcile previous experimental discrepancies and provide design guidelines for RuO$_2$-based spintronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_11602 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Strain-Driven Altermagnetic Spin Splitting Effect in RuO$_2$ Lee, Seungjun Jeong, Seung Gyo Wang, Jian-Ping Jalan, Bharat Low, Tony Materials Science The non-relativistic spin-momentum locking in altermagnets gives rise to a time-reversal-odd spin Hall effect, known as the altermagnetic spin-splitting effect (ASSE). Although ASSE was first reported in RuO$_2$, subsequent experiments have yielded inconsistent results, leaving its spin-transport mechanism unclear. Here, we systematically investigate how strain, crystal orientation, and the Hubbard $U$ parameter influence the magnetic ground state and spin Hall response of RuO$_2$. Guided by recent experimental observations, we find that $U$ is likely smaller than the value required to induce intrinsic magnetism, suggesting that bulk RuO$_2$ and (001)/(101) RuO$_2$ thin films grown on TiO$_2$ are nonmagnetic in the absence of extrinsic effects. In contrast, (100) and (110) films exhibit strain-induced altermagnetic spin splitting, leading to a strong ASSE even without Hubbard $U$ corrections. These results reconcile previous experimental discrepancies and provide design guidelines for RuO$_2$-based spintronic devices. |
| title | Strain-Driven Altermagnetic Spin Splitting Effect in RuO$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2602.11602 |