Metallic antiferromagnets with broken inversion symmetry on the two sublattices, strong spin-orbit coupling, and high Néel temperatures offer alternative opportunities for applications in spintronics. Especially ${\mathrm{Mn}}_2\mathrm{Au}$, with a high Néel temperature and high conductivity, is particularly interesting for real-world applications. Here, manipulation of the orientation of the staggered magnetization, (i.e., the Néel vector) by current pulses was recently demonstrated, with the readout limited to studies of anisotropic magnetoresistance or x-ray magnetic linear dichroism. Here we report on the in-plane reflectivity anisotropy of ${\mathrm{Mn}}_2\mathrm{Au}$(001) films, which are Néel vector aligned in pulsed magnetic fields. In the near-infrared region, the anisotropy is approximately 0.6%, with higher reflectivity for the light polarized along the Néel vector. The observed magnetic linear dichroism is about 4 times larger than the anisotropic magnetoresistance. This suggests the dichroism in ${\mathrm{Mn}}_2\mathrm{Au}$ is a result of the strong spin-orbit interactions giving rise to anisotropy of interband optical transitions, which is in line with recent studies of electronic band structure. The considerable magnetic linear dichroism in the near-infrared region could be used for ultrafast optical readout of the Néel vector in ${\mathrm{Mn}}_2\mathrm{Au}$.

中文翻译：

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金属反铁磁体Mn2Au中Néel矢量的光学读数

在两个亚晶格上具有破坏的反转对称性、强自旋轨道耦合和高尼尔温度的金属反铁磁体为自旋电子学的应用提供了替代机会。尤其${锰}_2金$，具有高尼尔温度和高导电性，对于实际应用特别有趣。在这里，最近证明了电流脉冲对交错磁化方向（即 Néel 矢量）的操纵，其读数仅限于各向异性磁阻或 X 射线磁线性二色性的研究。在这里，我们报告了面内反射率各向异性${锰}_2金$(001) 薄膜，它们是在脉冲磁场中排列的 Néel 矢量。在近红外区域，各向异性约为 0.6%，对沿 Néel 矢量偏振的光具有更高的反射率。观察到的磁线性二色性大约是各向异性磁阻的 4 倍。这表明二色性${锰}_2金$是强自旋轨道相互作用的结果，导致带间光学跃迁的各向异性，这与最近对电子能带结构的研究一致。近红外区域相当大的磁性线性二色性可用于超快光学读出 Néel 矢量${锰}_2金$.