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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.05198 |
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| _version_ | 1866913826678505472 |
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| author | Cho, Woohyun Cha, Jaehun Kang, Yoon-Gu Lee, Dong Hyun David Oh, Jaehwan Kim, Dohyun Yer, Sangsu Lee, Jaein Hong, Heemyoung Yang, Yongsoo Kim, Yeong Kwan Han, Myung Joon Yang, Heejun |
| author_facet | Cho, Woohyun Cha, Jaehun Kang, Yoon-Gu Lee, Dong Hyun David Oh, Jaehwan Kim, Dohyun Yer, Sangsu Lee, Jaein Hong, Heemyoung Yang, Yongsoo Kim, Yeong Kwan Han, Myung Joon Yang, Heejun |
| contents | A single crystalline system typically stabilizes a unique state for spin ordering below a critical temperature. Certain materials exhibit multiple magnetic states, driven by structural phase transitions under varying thermodynamic conditions. Recently, van der Waals magnets have demonstrated subtle interlayer exchange interactions, offering a promising approach to electrically control spin states without structural transformation. Here, we report the emergence of three distinct magnetic states, ferromagnetic ordering and both collinear and non-collinear antiferromagnetic orderings, in a layered single crystalline magnet, cobalt-doped Fe3GaTe2 ((Co, Fe)3GaTe2). These three magnetic phases occur without structural phase transitions, a phenomenon we designate as polymorphic spin ordering in the material. The introduction of 16% Co-doping in Fe3GaTe2 modulates the interlayer magnetic interaction, enabling multiple spin orderings within the same lattice system with three critical temperatures: a Curie temperature for a ferromagnetic state (Tc=210 K) and two Neel temperatures for the collinear (TN1=110 K) and non-collinear (TN2=30 K) antiferromagnetic states. Our findings are supported by magnetic force microscopy, first-principles calculations, and circular dichroism angular photoemission spectroscopy, which reveals varying spin ordering and changes in the topological band structure and Berry curvature at different temperatures within the single-crystalline (Co, Fe)3GaTe2. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_05198 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Polymorphic spin ordering in a single-crystalline cobalt-doped Fe3GaTe2 Cho, Woohyun Cha, Jaehun Kang, Yoon-Gu Lee, Dong Hyun David Oh, Jaehwan Kim, Dohyun Yer, Sangsu Lee, Jaein Hong, Heemyoung Yang, Yongsoo Kim, Yeong Kwan Han, Myung Joon Yang, Heejun Materials Science Strongly Correlated Electrons A single crystalline system typically stabilizes a unique state for spin ordering below a critical temperature. Certain materials exhibit multiple magnetic states, driven by structural phase transitions under varying thermodynamic conditions. Recently, van der Waals magnets have demonstrated subtle interlayer exchange interactions, offering a promising approach to electrically control spin states without structural transformation. Here, we report the emergence of three distinct magnetic states, ferromagnetic ordering and both collinear and non-collinear antiferromagnetic orderings, in a layered single crystalline magnet, cobalt-doped Fe3GaTe2 ((Co, Fe)3GaTe2). These three magnetic phases occur without structural phase transitions, a phenomenon we designate as polymorphic spin ordering in the material. The introduction of 16% Co-doping in Fe3GaTe2 modulates the interlayer magnetic interaction, enabling multiple spin orderings within the same lattice system with three critical temperatures: a Curie temperature for a ferromagnetic state (Tc=210 K) and two Neel temperatures for the collinear (TN1=110 K) and non-collinear (TN2=30 K) antiferromagnetic states. Our findings are supported by magnetic force microscopy, first-principles calculations, and circular dichroism angular photoemission spectroscopy, which reveals varying spin ordering and changes in the topological band structure and Berry curvature at different temperatures within the single-crystalline (Co, Fe)3GaTe2. |
| title | Polymorphic spin ordering in a single-crystalline cobalt-doped Fe3GaTe2 |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.05198 |