Non-collinear Antiferromagnets and the Anomalous Hall Effect

Abstract

The anomalous Hall effect is investigated theoretically by means of density functional calculations for the non-collinear antiferromagnetic order of the hexagonal compounds Mn${}_3$Ge and Mn${}_3$Sn using various planar triangular magnetic configurations as well as unexpected non-planar configurations. The former give rise to anomalous Hall conductivities (AHC) that are found to be extremely anisotropic. For the planar cases the AHC is connected with Weyl-points in the energy-band structure, which are described in detail. If this case were observable in Mn${}_3$Ge, a large AHC of about 900 S/cm should be expected. However, in Mn${}_3$Ge it is the non-planar configuration that is energetically favored, in which case it gives rise to an AHC of 100 S/cm. The non-planar configuration allows a quantitative evaluation of the topological Hall effect that is seen to determine this value of the conductivity to a large extent. For Mn${}_3$Sn it is the planar configurations that are predicted to be observable. In this case the AHC can be as large as 250 S/cm.

5 pages, 7 figures

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• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe

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