Elucidating the origin of long-range ferromagnetic order in Fe$_3$GeTe$_2$ by low-energy magnon excitation studies
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912493651099648 |
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| author | Beier, Birte Walendy, Erik Arneth, Jan Brücher, Eva Kremer, Reinhard K. Klingeler, Rüdiger |
| author_facet | Beier, Birte Walendy, Erik Arneth, Jan Brücher, Eva Kremer, Reinhard K. Klingeler, Rüdiger |
| contents | We report a detailed high-field/high-frequency ferromagnetic resonance (HF-FMR) study of low-energy magnon excitations in the van der Waals ferromagnet Fe$_3$GeTe$_2$. At 2 K, the field dependence of the magnon branches is well described by a semiclassical domain-based model, from which we extract key microscopic parameters including the anisotropy gap $Δ= 170\pm 4$ GHz, the anisotropy field $B_{\rm A} = 5.85\pm 0.08$ T, and the effective $g$-factor $g_{\rm ab}\simeq g_{\rm c} = 2.07(4)$. Furthermore the uniaxial anisotropy constant was determined to be $K = (10.5\pm 0.23) \times 10^{-6}$ erg/cm$^3$. Anisotropic short-range magnetic order persists above $T_{\rm C}$ up to approximately 270 K, as evidenced by a finite anisotropy gap and anisotropic shifts in the FMR resonance fields. Both results clearly show the presence of anisotropic local magnetic fields well above $T_{\rm C}$. Our findings underscore the crucial role of magneto-crystalline anisotropy in driving long-range magnetic order in Fe$_3$GeTe$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_15366 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Elucidating the origin of long-range ferromagnetic order in Fe$_3$GeTe$_2$ by low-energy magnon excitation studies Beier, Birte Walendy, Erik Arneth, Jan Brücher, Eva Kremer, Reinhard K. Klingeler, Rüdiger Strongly Correlated Electrons Materials Science We report a detailed high-field/high-frequency ferromagnetic resonance (HF-FMR) study of low-energy magnon excitations in the van der Waals ferromagnet Fe$_3$GeTe$_2$. At 2 K, the field dependence of the magnon branches is well described by a semiclassical domain-based model, from which we extract key microscopic parameters including the anisotropy gap $Δ= 170\pm 4$ GHz, the anisotropy field $B_{\rm A} = 5.85\pm 0.08$ T, and the effective $g$-factor $g_{\rm ab}\simeq g_{\rm c} = 2.07(4)$. Furthermore the uniaxial anisotropy constant was determined to be $K = (10.5\pm 0.23) \times 10^{-6}$ erg/cm$^3$. Anisotropic short-range magnetic order persists above $T_{\rm C}$ up to approximately 270 K, as evidenced by a finite anisotropy gap and anisotropic shifts in the FMR resonance fields. Both results clearly show the presence of anisotropic local magnetic fields well above $T_{\rm C}$. Our findings underscore the crucial role of magneto-crystalline anisotropy in driving long-range magnetic order in Fe$_3$GeTe$_2$. |
| title | Elucidating the origin of long-range ferromagnetic order in Fe$_3$GeTe$_2$ by low-energy magnon excitation studies |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2507.15366 |