Crystal facet orientation and temperature dependence of charge and spin Hall effects in noncollinear antiferromagnet: A first-principles investigation

TL;DR

This study uses first-principles calculations to explore how crystal orientation and temperature affect charge and spin Hall effects in noncollinear antiferromagnet Mn3Pt, revealing significant anisotropy and potential for spintronics applications.

Contribution

It provides a comprehensive analysis of Hall effects in nc-AFMs, highlighting the dependence on crystal facet orientation and temperature, and elucidating underlying scattering mechanisms.

Findings

Hall conductivities are highly anisotropic and depend on crystal orientation.

Temperature influences Hall effects through phonon and spin disorder scattering.

Prominent spin Hall effect can generate spin currents with Sz polarization.

Abstract

Noncollinear antiferromagnets (nc-AFMs) have attracted increasing research attention in spintronics due to their unique spin structures and fascinating charge and spin transport properties. By using first-principles calculations, we comprehensively investigate the charge and spin Hall effects in representative noncollinear antiferromagnet Mn3Pt. Our study reveals that the Hall effects in nc-AFMs are critically dependent on the crystal facet orientation and temperature. For (001) orientated Mn3Pt, each charge and spin Hall conductivity element is comprised of both time reversal odd (T-odd) and even (T-even) contribution, associated with longitudinal conductivity, which leads to sizable and highly anisotropic Hall conductivity. The temperature dependence of charge and spin Hall conductivity has been elucidated by considering both phonon and spin disorder scattering. The scaling relations between Hall conductivity and longitudinal conductivity have also been investigated. The existence of prominent spin Hall effect in nc-AFMs may generate spin current with Sz spin polarization, which is advantageous for field free switching of perpendicular magnetization. Our work may provide unambiguous understanding on the charge and spin transport in noncollinear antiferromagnets and pave their way for applications in antiferromagnetic spintronics.