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- Title
Surface-specific thermal spin-depolarization on the half-metallic Heusler films.
- Authors
Sumida, Kazuki; Kakoki, Masaaki; Sakuraba, Yuya; Masuda, Keisuke; Goto, Kazuki; Kono, Takashi; Miyamoto, Koji; Miura, Yoshio; Hono, Kazuhiro; Okuda, Taichi; Kimura, Akio
- 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 (TC). 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 TC, 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. Co2MnSi Heusler alloy is a well-known half-metallic ferromagnet exhibiting a perfect spin-polarization (100%) and high Curie temperature (~ 985 K). Here, using surface sensitive spin- and angle-resolved photoelectron spectroscopy, the authors investigate the temperature evolution of the spin-polarized electronic structure of Co2MnSi films and reveal the surface-specific spin depolarization mechanism around room temperature.
- Subjects
PHOTOELECTRON spectroscopy; FERMI energy; ELECTRONIC structure; CURIE temperature; LOW temperatures
- Publication
Communications Physics, 2025, Vol 8, Issue 1, p1
- ISSN
2399-3650
- Publication type
Academic Journal
- DOI
10.1038/s42005-024-01918-w