Spontaneous Hall effect induced by collinear antiferromagnetic order at room temperature. Takagi, R., Hirakida, R., Settai, Y., Oiwa, R., Takagi, H., Kitaori, A., Yamauchi, K., Inoue, H., Yamaura, J., Nishio-Hamane, D., Itoh, S., Aji, S., Saito, H., Nakajima, T., Nomoto, T., Arita, R., & Seki, S. Nature Materials, December, 2024. Publisher: Nature Publishing Group![Spontaneous Hall effect induced by collinear antiferromagnetic order at room temperature [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Magnetic information is usually stored in ferromagnets, where the ↑ and ↓ spin states are distinguishable due to time-reversal symmetry breaking. These states induce opposite signs of the Hall effect proportional to magnetization, which is widely used for their electrical read-out. By contrast, conventional antiferromagnets with a collinear antiparallel spin configuration cannot host such functions, because of $$\\mathcal\T\\\\mathrm\t\\$$symmetry (time-reversal $$\\mathcal\T\\$$followed by translation t symmetry) and lack of macroscopic magnetization. Here we report the experimental observation of a spontaneous Hall effect in the collinear antiferromagnet FeS at room temperature. In this compound, the ↑↓ and ↓↑ spin states induce opposite signs of the spontaneous Hall effect. Our analysis suggests that this does not reflect magnetization, but rather originates from a fictitious magnetic field associated with the $$\\mathcal\T\\\\mathrm\t\\$$-symmetry-broken antiferromagnetic order. The present results pave the way for electrical reading and writing of the ↑↓ and ↓↑ spin states in conductive systems at room temperature, and suggest that $$\\mathcal\T\\\\mathrm\t\\$$-symmetry-broken collinear antiferromagnets can serve as an information medium with vanishingly small magnetization.
@article{takagi_spontaneous_2024,
title = {Spontaneous {Hall} effect induced by collinear antiferromagnetic order at room temperature},
copyright = {2024 The Author(s), under exclusive licence to Springer Nature Limited},
issn = {1476-4660},
url = {https://www.nature.com/articles/s41563-024-02058-w},
doi = {10.1038/s41563-024-02058-w},
abstract = {Magnetic information is usually stored in ferromagnets, where the ↑ and ↓ spin states are distinguishable due to time-reversal symmetry breaking. These states induce opposite signs of the Hall effect proportional to magnetization, which is widely used for their electrical read-out. By contrast, conventional antiferromagnets with a collinear antiparallel spin configuration cannot host such functions, because of \$\$\{{\textbackslash}mathcal\{T\}\}\{{\textbackslash}mathrm\{t\}\}\$\$symmetry (time-reversal \$\$\{{\textbackslash}mathcal\{T\}\}\$\$followed by translation t symmetry) and lack of macroscopic magnetization. Here we report the experimental observation of a spontaneous Hall effect in the collinear antiferromagnet FeS at room temperature. In this compound, the ↑↓ and ↓↑ spin states induce opposite signs of the spontaneous Hall effect. Our analysis suggests that this does not reflect magnetization, but rather originates from a fictitious magnetic field associated with the \$\$\{{\textbackslash}mathcal\{T\}\}\{{\textbackslash}mathrm\{t\}\}\$\$-symmetry-broken antiferromagnetic order. The present results pave the way for electrical reading and writing of the ↑↓ and ↓↑ spin states in conductive systems at room temperature, and suggest that \$\$\{{\textbackslash}mathcal\{T\}\}\{{\textbackslash}mathrm\{t\}\}\$\$-symmetry-broken collinear antiferromagnets can serve as an information medium with vanishingly small magnetization.},
language = {en},
urldate = {2024-12-28},
journal = {Nature Materials},
author = {Takagi, Rina and Hirakida, Ryosuke and Settai, Yuki and Oiwa, Rikuto and Takagi, Hirotaka and Kitaori, Aki and Yamauchi, Kensei and Inoue, Hiroki and Yamaura, Jun-ichi and Nishio-Hamane, Daisuke and Itoh, Shinichi and Aji, Seno and Saito, Hiraku and Nakajima, Taro and Nomoto, Takuya and Arita, Ryotaro and Seki, Shinichiro},
month = dec,
year = {2024},
note = {Publisher: Nature Publishing Group},
keywords = {Magnetic properties and materials},
pages = {1--6},
}
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These states induce opposite signs of the Hall effect proportional to magnetization, which is widely used for their electrical read-out. By contrast, conventional antiferromagnets with a collinear antiparallel spin configuration cannot host such functions, because of $$\\\\mathcal\\T\\\\\\\\mathrm\\t\\\\$$symmetry (time-reversal $$\\\\mathcal\\T\\\\$$followed by translation t symmetry) and lack of macroscopic magnetization. Here we report the experimental observation of a spontaneous Hall effect in the collinear antiferromagnet FeS at room temperature. In this compound, the ↑↓ and ↓↑ spin states induce opposite signs of the spontaneous Hall effect. Our analysis suggests that this does not reflect magnetization, but rather originates from a fictitious magnetic field associated with the $$\\\\mathcal\\T\\\\\\\\mathrm\\t\\\\$$-symmetry-broken antiferromagnetic order. 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