Abstract

GONZALEZ-HERNANDEZ, Rafael; GONZALEZ, Roberto  and  ŠMEJKAL, Libor. Crystal Hall effect in an unconventional collinear antiferromagnet NiF₂. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2022, vol.46, n.180, pp.617-627.  Epub Sep 18, 2023. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.1643.

Dissipation less transversal Hall currents are intensively researched for more than one century due to their intriguing quantum, relativistic, and topological origin. The spontaneous Hall effect requires time-reversal symmetry breaking, which is induced by the spin ordering and traditionally was attributed to the magnetization in ferromagnetic materials such as iron. Recently, spontaneous, so-called crystal, Hall effect was identified, which is induced by unconventional magnetism arising from the interplay of collinear antiferromagnetism tron filling, and we predict spontaneous Hall response can be as large as 700 S/cm. In NiF2, the antiferromagnetic vector is oriented along the crystal axis conducive for the Hall response. This property is elusive in other recently studied rutile crystals where the antiferromagnetic vector had to be reoriented by the applied field. Additionally, we analyze the momentum space resolved contribution to the spontaneous Hall conductivity and the Néel vector rotation dependence of the effect. Our calculations show that the NiF2 can be useful element in future spintronics based on unconventional antiferromagnets.

Keywords : Materials simulation, Crystal Hall effect; Antiferromagnetic materials; NiF₂.

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