Altermagnetic band splitting in 10 nm epitaxial CrSb thin films
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Santhosh, Sandra Corbae, Paul Yanez-Parreno, Wilson J. Ghosh, Supriya Jensen, Christopher J. Fedorov, Alexei V. Hashimoto, Makoto Lu, Donghui Borchers, Julie A. Grutter, Alexander J. Charlton, Timothy R. Islam, Saurav Richardella, Anthony Mkhoyan, K. Andre Palmstrøm, Christopher J. Ou, Yongxi Samarth, Nitin |
| author_facet | Santhosh, Sandra Corbae, Paul Yanez-Parreno, Wilson J. Ghosh, Supriya Jensen, Christopher J. Fedorov, Alexei V. Hashimoto, Makoto Lu, Donghui Borchers, Julie A. Grutter, Alexander J. Charlton, Timothy R. Islam, Saurav Richardella, Anthony Mkhoyan, K. Andre Palmstrøm, Christopher J. Ou, Yongxi Samarth, Nitin |
| contents | Altermagnets are a newly identified family of collinear antiferromagnets with momentum-dependent spin-split band structure of non-relativistic origin, derived from spin-group symmetry-protected crystal structures. Among candidate altermagnets, CrSb is attractive for potential applications because of a large spin-splitting near the Fermi level and a high Neel transition temperature of around 700 K. We use molecular beam epitaxy to synthesize CrSb (0001) thin films with thicknesses ranging from 10 nm to 100 nm. Structural characterization, using reflection high energy electron diffraction, scanning transmission electron microscopy, and X-ray diffraction, demonstrates the growth of epitaxial films with good crystallinity. Polarized neutron reflectometry shows the absence of any net magnetization, consistent with antiferromagnetic order. In vacuo angle resolved photoemission spectroscopy (ARPES) measurements probe the band structure in a previously unexplored regime of film thickness, down to 10 nm. These ARPES measurements show a three-dimensional momentum-dependent band splitting of up to 0.7 eV with g-wave symmetry, consistent with that seen in prior studies of bulk single crystals. The distinct altermagnetic band structure required for potential spin-transport applications survives down to the 10 nm thin film limit at room temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00239 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Altermagnetic band splitting in 10 nm epitaxial CrSb thin films Santhosh, Sandra Corbae, Paul Yanez-Parreno, Wilson J. Ghosh, Supriya Jensen, Christopher J. Fedorov, Alexei V. Hashimoto, Makoto Lu, Donghui Borchers, Julie A. Grutter, Alexander J. Charlton, Timothy R. Islam, Saurav Richardella, Anthony Mkhoyan, K. Andre Palmstrøm, Christopher J. Ou, Yongxi Samarth, Nitin Materials Science Mesoscale and Nanoscale Physics Altermagnets are a newly identified family of collinear antiferromagnets with momentum-dependent spin-split band structure of non-relativistic origin, derived from spin-group symmetry-protected crystal structures. Among candidate altermagnets, CrSb is attractive for potential applications because of a large spin-splitting near the Fermi level and a high Neel transition temperature of around 700 K. We use molecular beam epitaxy to synthesize CrSb (0001) thin films with thicknesses ranging from 10 nm to 100 nm. Structural characterization, using reflection high energy electron diffraction, scanning transmission electron microscopy, and X-ray diffraction, demonstrates the growth of epitaxial films with good crystallinity. Polarized neutron reflectometry shows the absence of any net magnetization, consistent with antiferromagnetic order. In vacuo angle resolved photoemission spectroscopy (ARPES) measurements probe the band structure in a previously unexplored regime of film thickness, down to 10 nm. These ARPES measurements show a three-dimensional momentum-dependent band splitting of up to 0.7 eV with g-wave symmetry, consistent with that seen in prior studies of bulk single crystals. The distinct altermagnetic band structure required for potential spin-transport applications survives down to the 10 nm thin film limit at room temperature. |
| title | Altermagnetic band splitting in 10 nm epitaxial CrSb thin films |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2505.00239 |