Ferromagnetic resonance in an antiferromagnetic crystal EuSn$_2$As$_2$
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| _version_ | 1866909963215962112 |
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| author | Gimazov, I. I. Zhelezniakova, D. E. Zaripov, R. B. Talanov, Yu. I. Levakhova, A. Yu. Sadakov, A. V. Pervakov, K. S. Vlasenko, V. A. Vasiliev, A. L. Pudalov, V. M. |
| author_facet | Gimazov, I. I. Zhelezniakova, D. E. Zaripov, R. B. Talanov, Yu. I. Levakhova, A. Yu. Sadakov, A. V. Pervakov, K. S. Vlasenko, V. A. Vasiliev, A. L. Pudalov, V. M. |
| contents | We report results of electron spin resonance (ESR) measurements in single crystals of EuSn$_2$As$_2$. In the temperature range of antiferromagnetic (AFM) ordering of Eu atoms, $T \leq T_N\approx 24$\,K, the ESR signal splits into two resonance lines, one of which, at high-field (or low-frequency), is the conventional acoustic AFM resonance mode that occurs at temperatures below $T_N$. The lower-field (high-frequency) line, as we have proven here, is the ferromagnetic resonance associated with the presence in the layered AFM crystal of a small amount ($\sim 3\%$) of planar nanodefects with a non-zero ferromagnetic (FM) moment. The existence of ferromagnetic nano-inclusions in the bulk of the antiferromagnetic compound makes EuSn$_2$As$_2$ a peculiar example of a natural magnetic metamaterial. We believe that the planar FM nanodefects are also inherent in other layered AFM compounds, which explains often observed increase in their magnetic susceptibility upon cooling at $T< T_N\rightarrow 0$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_13571 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ferromagnetic resonance in an antiferromagnetic crystal EuSn$_2$As$_2$ Gimazov, I. I. Zhelezniakova, D. E. Zaripov, R. B. Talanov, Yu. I. Levakhova, A. Yu. Sadakov, A. V. Pervakov, K. S. Vlasenko, V. A. Vasiliev, A. L. Pudalov, V. M. Materials Science We report results of electron spin resonance (ESR) measurements in single crystals of EuSn$_2$As$_2$. In the temperature range of antiferromagnetic (AFM) ordering of Eu atoms, $T \leq T_N\approx 24$\,K, the ESR signal splits into two resonance lines, one of which, at high-field (or low-frequency), is the conventional acoustic AFM resonance mode that occurs at temperatures below $T_N$. The lower-field (high-frequency) line, as we have proven here, is the ferromagnetic resonance associated with the presence in the layered AFM crystal of a small amount ($\sim 3\%$) of planar nanodefects with a non-zero ferromagnetic (FM) moment. The existence of ferromagnetic nano-inclusions in the bulk of the antiferromagnetic compound makes EuSn$_2$As$_2$ a peculiar example of a natural magnetic metamaterial. We believe that the planar FM nanodefects are also inherent in other layered AFM compounds, which explains often observed increase in their magnetic susceptibility upon cooling at $T< T_N\rightarrow 0$. |
| title | Ferromagnetic resonance in an antiferromagnetic crystal EuSn$_2$As$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2512.13571 |