Spin-order dependent anomalous Hall effect and magneto-optical effect in the noncollinear antiferromagnets Mn3XN with X = Ga, Zn, Ag, or Ni
Spin-order dependent anomalous Hall effect and magneto-optical effect in the noncollinear antiferromagnets Mn3XN with X = Ga, Zn, Ag, or Ni
复制标题
X = Ga、Zn、Ag 或 Ni 的非共线反铁磁体 Mn3XN 中自旋顺序相关的反常霍尔效应和磁光效应
DOI：
10.1103/physrevb.99.104428
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发表时间：
2019
影响因子：
3.7
通讯作者：
Mokrousov Yuriy
中科院分区：
文献类型：
--
作者：
Zhou Xiaodong;Hanke Jan-Philipp;Feng Wanxiang;Li Fei;Guo Guang-Yu;Yao Yugui;Bluegel Stefan;Mokrousov Yuriy
反常霍尔效应（AHE）和磁光效应（MOE）是磁性材料中时间反转对称性破缺的两种突出表现。非线性共线反铁磁体（AFMs）由于在几何挫折晶格上可能出现奇异的自旋顺序而引起了人们的广泛关注，这些自旋顺序可以用相应的自旋手性来表征。通过第一性原理密度泛函计算、群论分析和紧密结合模型，我们系统地研究了具有代表性的非共线原子力显微镜（Zn、Ag和Ni）中自旋顺序相关的AHE和MOE。通过对相关磁点群的分析，确定了不同自旋阶本征异常霍尔电导率的对称相关张量形状。我们证明，虽然只有IAHC张量的分量在右手自旋手性中不为零，但由于对称性的降低，所有其他元素-和-在左手自旋手性状态中不消失。我们的紧密结合的论点表明，IAHC的大小依赖于带结构的细节，并且随着自旋在平面内旋转而周期性调制。从第一性原理得到的IAHC是相当大的，例如，它达到359 S/cm in，这与其他众所周知的非线性原子力显微镜（如和）相当。我们还计算了磁各向异性能，发现自旋序的演化与离子中价电子的数目有关。有趣的是，左手自旋手性可以存在于某些特定的自旋构型中。通过将我们的分析扩展到有限频率，我们计算了光学各向异性和磁光各向异性。与IAHC类似，磁光克尔光谱和法拉第光谱强烈依赖于自旋顺序。克尔旋转角在的范围内，与其它非线性原子力显微镜相比，克尔旋转角较大。我们的发现表明，这些材料为实现新型自旋电子学和磁光器件提供了一个很好的反铁磁平台。我们认为自旋顺序相关的AHE和MOE在检测非线性原子力显微镜中的复杂自旋结构中是必不可少的。
The anomalous Hall effect (AHE) and the magneto-optical effect (MOE) are two prominent manifestations of time-reversal symmetry breaking in magnetic materials. Noncollinear antiferromagnets (AFMs) have recently attracted a lot of attention owing to the potential emergence of exotic spin orders on geometrically frustrated lattices, which can be characterized by corresponding spin chiralities. By performing first-principles density functional calculations together with group-theory analysis and tight-binding modeling, here we systematically study the spin-order dependent AHE and MOE in representative noncollinear AFMs, Zn, Ag, and Ni). The symmetry-related tensor shape of the intrinsic anomalous Hall conductivity (IAHC) for different spin orders is determined by analyzing the relevant magnetic point groups. We show that while only thecomponent of the IAHC tensor is nonzero for right-handed spin chirality, all other elements—, and—are nonvanishing for a state with left-handed spin chirality owing to lowering of the symmetry. Our tight-binding arguments reveal that the magnitude of IAHC relies on the details of the band structure and thatis periodically modulated as the spin rotates in-plane. The IAHC obtained from first principles is found to be rather large, e.g., it amounts to 359 S/cm in, which is comparable to other well-known noncollinear AFMs such asand. We evaluate also the magnetic anisotropy energy and find that the evolution of spin order is related to the number of valence electrons in theion. Interestingly, the left-handed spin chirality could exist inwith some particular spin configurations. By extending our analysis to finite frequencies, we calculate the optical isotropyand the magneto-optical anisotropyof. Similar to the IAHC, the magneto-optical Kerr and Faraday spectra depend strongly on the spin order. The Kerr rotation angles inare in the range of, which is large and comparable to other noncollinear AFMs likeand. Our finding of large AHE and MOE insuggests that these materials present an excellent antiferromagnetic platform for realizing novel spintronics and magneto-optical devices. We argue that the spin-order dependent AHE and MOE are indispensable in detecting complex spin structures in noncollinear AFMs.