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arXiv 2104.07964cond-mat.str-el
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各向异性磁偶极子在反常霍尔效应中的本质作用

Essential role of anisotropic magnetic dipole in anomalous Hall effect

Satoru Hayami, Hiroaki Kusunose

摘要:

本文从理论上研究了共线反铁磁体中既不需要净磁化也不需要外加磁场的反常霍尔效应。我们表明,这种紧急AHE基本上是由各向异性磁偶极子(AMD),它提供了一个有效的有序磁矩和电子运动之间的耦合晶体的铁电有序。我们证明了AMD是自然诱发的反铁磁有序,其中的磁矩具有四极空间分布。从铁性AMD有序的角度出发,分析了AHE在正交晶格系统中的行为,其中AHE在很大程度上被AMD和自旋轨道相互作用之间的大耦合所增强。从这些发现中,AMD可以被用来作为一个描述符,在一般情况下,调查的铁磁相关的物理量的反铁磁体,包括非共线的,这是可以检测到的使用x射线磁圆二色性。

英文摘要:

We theoretically investigate the anomalous Hall effect (AHE) that requires neither a net magnetization nor an external magnetic field in collinear antiferromagnets. We show that such an emergent AHE is essentially caused by a ferroic ordering of the anisotropic magnetic dipole (AMD), which provides an effective coupling between ordered magnetic moments and electronic motion in the crystal. We demonstrate that the AMD is naturally induced by the antiferromagnetic ordering, in which the magnetic moments have a quadrupole spatial distribution. In view of the ferroic AMD ordering, we analyze the behavior of the AHE in the orthorhombic lattice system, where the AHE is largely enhanced by the large coupling between the AMD and the spin-orbit interaction. From these findings, the AMD can be used as a descriptor in general to investigate the ferromagnetic-related physical quantities in antiferromagnets including noncollinear ones, which is detectable by using the x-ray magneto-circular dichroism.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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