Magnetic anisotropy in single-crystalline antiferromagnetic Mn$_2$Au
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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
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2024
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| _version_ | 1866914904980586496 |
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| author | Gebre, Mebatsion S. Banner, Rebecca K. Kang, Kisung Qu, Kejian Cao, Huibo Schleife, André Shoemaker, Daniel P. |
| author_facet | Gebre, Mebatsion S. Banner, Rebecca K. Kang, Kisung Qu, Kejian Cao, Huibo Schleife, André Shoemaker, Daniel P. |
| contents | Multiple recent studies have identified the metallic antiferromagnet Mn$_2$Au to be a candidate for spintronic applications due to apparent in-plane anisotropy, preserved magnetic properties above room temperature, and current-induced Néel vector switching. Crystal growth is complicated by the fact that Mn$_2$Au melts incongruently. We present a bismuth flux method to grow millimeter-scale bulk single crystals of Mn$_2$Au in order to examine the intrinsic anisotropic electrical and magnetic properties. Flux quenching experiments reveal that the Mn$_2$Au crystals precipitate below 550°C, about 100°C below the decomposition temperature of Mn$_2$Au. Bulk Mn$_2$Au crystals have a room-temperature resistivity of 16-19 $μΩ$-cm and a residual resistivity ratio of 41. Mn$_2$Au crystals have a dimensionless susceptibility on the order of 10$^{-4}$, comparable to calculated and experimental reports on powder samples. Single-crystal neutron diffraction confirms the in-plane magnetic structure. The tetragonal symmetry of Mn$_2$Au constrains the $ab$-plane magnetic susceptibility to be constant, meaning that $χ_{100}=χ_{110}$ in the low-field limit, below any spin-flop transition. We find that three measured magnetic susceptibilities $χ_{100}$, $χ_{110}$, and $χ_{001}$ are the same order of magnitude and agree with the calculated prediction, meaning the low-field susceptibility of Mn$_2$Au is quite isotropic, despite clear differences in $ab$-plane and $ac$-plane magnetocrystalline anisotropy. Mn$_2$Au is calculated to have an extremely high in-plane spin-flop field above 30 T, which is much larger than that of another in-plane antiferromagnet Fe$_2$As (less than 1 T). The subtle anisotropy of intrinsic susceptibilities may lead to dominating effects from shape, crystalline texture, strain, and defects in devices that attempt spin readout in Mn$_2$Au. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_15525 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic anisotropy in single-crystalline antiferromagnetic Mn$_2$Au Gebre, Mebatsion S. Banner, Rebecca K. Kang, Kisung Qu, Kejian Cao, Huibo Schleife, André Shoemaker, Daniel P. Materials Science Multiple recent studies have identified the metallic antiferromagnet Mn$_2$Au to be a candidate for spintronic applications due to apparent in-plane anisotropy, preserved magnetic properties above room temperature, and current-induced Néel vector switching. Crystal growth is complicated by the fact that Mn$_2$Au melts incongruently. We present a bismuth flux method to grow millimeter-scale bulk single crystals of Mn$_2$Au in order to examine the intrinsic anisotropic electrical and magnetic properties. Flux quenching experiments reveal that the Mn$_2$Au crystals precipitate below 550°C, about 100°C below the decomposition temperature of Mn$_2$Au. Bulk Mn$_2$Au crystals have a room-temperature resistivity of 16-19 $μΩ$-cm and a residual resistivity ratio of 41. Mn$_2$Au crystals have a dimensionless susceptibility on the order of 10$^{-4}$, comparable to calculated and experimental reports on powder samples. Single-crystal neutron diffraction confirms the in-plane magnetic structure. The tetragonal symmetry of Mn$_2$Au constrains the $ab$-plane magnetic susceptibility to be constant, meaning that $χ_{100}=χ_{110}$ in the low-field limit, below any spin-flop transition. We find that three measured magnetic susceptibilities $χ_{100}$, $χ_{110}$, and $χ_{001}$ are the same order of magnitude and agree with the calculated prediction, meaning the low-field susceptibility of Mn$_2$Au is quite isotropic, despite clear differences in $ab$-plane and $ac$-plane magnetocrystalline anisotropy. Mn$_2$Au is calculated to have an extremely high in-plane spin-flop field above 30 T, which is much larger than that of another in-plane antiferromagnet Fe$_2$As (less than 1 T). The subtle anisotropy of intrinsic susceptibilities may lead to dominating effects from shape, crystalline texture, strain, and defects in devices that attempt spin readout in Mn$_2$Au. |
| title | Magnetic anisotropy in single-crystalline antiferromagnetic Mn$_2$Au |
| topic | Materials Science |
| url | https://arxiv.org/abs/2404.15525 |