High temperature Neel skyrmions in simple ferromagnets
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866916995997368320 |
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| author | Wang, Peng Saha, Rana Meyerheim, Holger L. Gu, Ke Deniz, Hakan Eilmsteiner, David Migliorini, Andrea Zuazo, Juan Rubio Sebastiani-Tofano, Engenia Kostanovski, Ilya Srivastava, Abhay Kant Ernst, Arthur Parkin, Stuart S. P. |
| author_facet | Wang, Peng Saha, Rana Meyerheim, Holger L. Gu, Ke Deniz, Hakan Eilmsteiner, David Migliorini, Andrea Zuazo, Juan Rubio Sebastiani-Tofano, Engenia Kostanovski, Ilya Srivastava, Abhay Kant Ernst, Arthur Parkin, Stuart S. P. |
| contents | A wide variety of chiral non-collinear spin textures have been discovered and have unique properties that make them highly interesting for technological applications. However, many of these are found in complex materials and only in a narrow window of temperature. Here, we show the formation of Neel-type skyrmions in thin layers of simple ferromagnetic alloys, namely Co-Al and Co-Ni-Al, over a wide range of temperature up to 770 K, by imposing a vertical strain gradient via epitaxy with an Ir-Al underlayer. The Neel skyrmions are directly observed using Lorentz transmission electron microscopy in freestanding membranes at high temperatures and the strain gradient is directly measured from x-ray diffraction anomalous peak profiles. Our concept allows simple centrosymmetric ferromagnets with high magnetic ordering temperatures to exhibit hot skyrmions, thereby, bringing closer skyrmionic electronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_06488 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High temperature Neel skyrmions in simple ferromagnets Wang, Peng Saha, Rana Meyerheim, Holger L. Gu, Ke Deniz, Hakan Eilmsteiner, David Migliorini, Andrea Zuazo, Juan Rubio Sebastiani-Tofano, Engenia Kostanovski, Ilya Srivastava, Abhay Kant Ernst, Arthur Parkin, Stuart S. P. Materials Science A wide variety of chiral non-collinear spin textures have been discovered and have unique properties that make them highly interesting for technological applications. However, many of these are found in complex materials and only in a narrow window of temperature. Here, we show the formation of Neel-type skyrmions in thin layers of simple ferromagnetic alloys, namely Co-Al and Co-Ni-Al, over a wide range of temperature up to 770 K, by imposing a vertical strain gradient via epitaxy with an Ir-Al underlayer. The Neel skyrmions are directly observed using Lorentz transmission electron microscopy in freestanding membranes at high temperatures and the strain gradient is directly measured from x-ray diffraction anomalous peak profiles. Our concept allows simple centrosymmetric ferromagnets with high magnetic ordering temperatures to exhibit hot skyrmions, thereby, bringing closer skyrmionic electronics. |
| title | High temperature Neel skyrmions in simple ferromagnets |
| topic | Materials Science |
| url | https://arxiv.org/abs/2510.06488 |