Surface-specific thermal spin-depolarization on the half-metallic Heusler films
Abstract Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (T C). Magnetic junction devices using Co2MnSi show remarkable perfor...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-01-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-024-01918-w |
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| _version_ | 1841559361308065792 |
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| author | Kazuki Sumida Masaaki Kakoki Yuya Sakuraba Keisuke Masuda Kazuki Goto Takashi Kono Koji Miyamoto Yoshio Miura Kazuhiro Hono Taichi Okuda Akio Kimura |
| author_facet | Kazuki Sumida Masaaki Kakoki Yuya Sakuraba Keisuke Masuda Kazuki Goto Takashi Kono Koji Miyamoto Yoshio Miura Kazuhiro Hono Taichi Okuda Akio Kimura |
| author_sort | Kazuki Sumida |
| collection | DOAJ |
| description | Abstract Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (T C). Magnetic junction devices using Co2MnSi show remarkable performance at low temperatures. However, the performance is significantly degraded at room temperature, which requires a detailed understanding of the temperature-dependent electronic structure of Co2MnSi films. Here, using surface-sensitive spin- and angle-resolved photoelectron spectroscopy combined with first-principles calculations, we verify the temperature- and momentum-dependent spin-polarization of Co2MnSi thin-film. The recorded spin-polarization reaches ~ 60-75% at 50 K, while it reduces ~ 30-50% at 300 K. The observed surface-specific spin-depolarization behavior can be described by the thermally excited magnon model even well below T C, and we conclude that the spin-fluctuation is markedly enhanced on its surface. Our findings provide insights into the temperature-dependent electronic structure of half-metallic Heusler films, which could have significant implications for future spintronic applications. |
| format | Article |
| id | doaj-art-5e126978b28a4285b72061e10c229c73 |
| institution | Kabale University |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-5e126978b28a4285b72061e10c229c732025-01-05T12:32:46ZengNature PortfolioCommunications Physics2399-36502025-01-01811710.1038/s42005-024-01918-wSurface-specific thermal spin-depolarization on the half-metallic Heusler filmsKazuki Sumida0Masaaki Kakoki1Yuya Sakuraba2Keisuke Masuda3Kazuki Goto4Takashi Kono5Koji Miyamoto6Yoshio Miura7Kazuhiro Hono8Taichi Okuda9Akio Kimura10Research Institute for Synchrotron Radiation Science, Hiroshima UniversityGraduate School of Advanced Science and Engineering, Hiroshima UniversityResearch Center for Magnetic and Spintronic Materials, National Institute for Materials ScienceResearch Center for Magnetic and Spintronic Materials, National Institute for Materials ScienceResearch Center for Magnetic and Spintronic Materials, National Institute for Materials ScienceGraduate School of Science, Hiroshima UniversityResearch Institute for Synchrotron Radiation Science, Hiroshima UniversityResearch Center for Magnetic and Spintronic Materials, National Institute for Materials ScienceResearch Center for Magnetic and Spintronic Materials, National Institute for Materials ScienceResearch Institute for Synchrotron Radiation Science, Hiroshima UniversityGraduate School of Advanced Science and Engineering, Hiroshima UniversityAbstract Half-metallic ferromagnets exhibit a perfect spin-polarization at the Fermi energy. Among many candidates, Co2MnSi Heusler alloy is the most investigated material due to its half-metallic nature and high Curie temperature (T C). Magnetic junction devices using Co2MnSi show remarkable performance at low temperatures. However, the performance is significantly degraded at room temperature, which requires a detailed understanding of the temperature-dependent electronic structure of Co2MnSi films. Here, using surface-sensitive spin- and angle-resolved photoelectron spectroscopy combined with first-principles calculations, we verify the temperature- and momentum-dependent spin-polarization of Co2MnSi thin-film. The recorded spin-polarization reaches ~ 60-75% at 50 K, while it reduces ~ 30-50% at 300 K. The observed surface-specific spin-depolarization behavior can be described by the thermally excited magnon model even well below T C, and we conclude that the spin-fluctuation is markedly enhanced on its surface. Our findings provide insights into the temperature-dependent electronic structure of half-metallic Heusler films, which could have significant implications for future spintronic applications.https://doi.org/10.1038/s42005-024-01918-w |
| spellingShingle | Kazuki Sumida Masaaki Kakoki Yuya Sakuraba Keisuke Masuda Kazuki Goto Takashi Kono Koji Miyamoto Yoshio Miura Kazuhiro Hono Taichi Okuda Akio Kimura Surface-specific thermal spin-depolarization on the half-metallic Heusler films Communications Physics |
| title | Surface-specific thermal spin-depolarization on the half-metallic Heusler films |
| title_full | Surface-specific thermal spin-depolarization on the half-metallic Heusler films |
| title_fullStr | Surface-specific thermal spin-depolarization on the half-metallic Heusler films |
| title_full_unstemmed | Surface-specific thermal spin-depolarization on the half-metallic Heusler films |
| title_short | Surface-specific thermal spin-depolarization on the half-metallic Heusler films |
| title_sort | surface specific thermal spin depolarization on the half metallic heusler films |
| url | https://doi.org/10.1038/s42005-024-01918-w |
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