Universality of magnetic susceptibility in the conical state of kagome ferromagnet Fe$_3$Sn$_2$
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| Format: | Preprint |
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2026
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| _version_ | 1866910211870031872 |
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| author | Prodan, Lilian Evans, Donald M. Puntigam, Lukas Kézsmárki, 1 István Tsurkan, Vladimir |
| author_facet | Prodan, Lilian Evans, Donald M. Puntigam, Lukas Kézsmárki, 1 István Tsurkan, Vladimir |
| contents | We report universal behavior of the differential magnetic susceptibility (DMS) in the conical phase that mediates the spin-reorientation (SR) transition of the kagome ferromagnet Fe$_3$Sn$_2$. Within the SR temperature range, the DMS isotherms exhibit extremely narrow crossing regions, forming isosbestic points. Using an isosbestic-invariance analysis, we show that the isotherms collapse onto a single temperature-independent curve, revealing quadratic-in-temperature corrections to the susceptibility. Complementary field-dependent magnetic-force-microscopy measurements uncover evolution of spin textures from stripe-like domains at low fields to isolated bubble-like domains near the isosbestic field ($\sim 0.6$~T), a behavior not previously reported in bulk Fe$_3$Sn$_2$ within the conical state. These findings point to a universal mechanism for the emergence of complex magnetic textures near isosbestic points, driven by the competition between magnetocrystalline anisotropy, dipolar interactions, and external magnetic field. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_11851 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Universality of magnetic susceptibility in the conical state of kagome ferromagnet Fe$_3$Sn$_2$ Prodan, Lilian Evans, Donald M. Puntigam, Lukas Kézsmárki, 1 István Tsurkan, Vladimir Materials Science We report universal behavior of the differential magnetic susceptibility (DMS) in the conical phase that mediates the spin-reorientation (SR) transition of the kagome ferromagnet Fe$_3$Sn$_2$. Within the SR temperature range, the DMS isotherms exhibit extremely narrow crossing regions, forming isosbestic points. Using an isosbestic-invariance analysis, we show that the isotherms collapse onto a single temperature-independent curve, revealing quadratic-in-temperature corrections to the susceptibility. Complementary field-dependent magnetic-force-microscopy measurements uncover evolution of spin textures from stripe-like domains at low fields to isolated bubble-like domains near the isosbestic field ($\sim 0.6$~T), a behavior not previously reported in bulk Fe$_3$Sn$_2$ within the conical state. These findings point to a universal mechanism for the emergence of complex magnetic textures near isosbestic points, driven by the competition between magnetocrystalline anisotropy, dipolar interactions, and external magnetic field. |
| title | Universality of magnetic susceptibility in the conical state of kagome ferromagnet Fe$_3$Sn$_2$ |
| topic | Materials Science |
| url | https://arxiv.org/abs/2605.11851 |