Spin-order dependent anomalous Hall effect and magneto-optical effect in noncollinear antiferromagnets MnN ( = Ga, Zn, Ag, and Ni)
arXiv:1903.11038 · doi:10.1103/PhysRevB.99.104428
Abstract
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 modelling, here we systematically study the spin-order dependent anomalous Hall effect (AHE) and magneto-optical effect (MOE) in representative noncollinear AFMs MnN ( = Ga, 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 the component 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 that is 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 MnAgN. By extending our analysis to finite frequencies, we calculate the optical isotropy [] and the magneto-optical anisotropy [] of MnN. We argue that the spin-order dependent AHE and MOE are indispensable in detecting complex spin structures in noncollinear AFMs.
arXiv comment13 pages, 7 figures
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