Non-collinear antiferromagnets exhibits richer magneto-transport properties due to the topologically nontrivial spin structure they possess compared to conventional nonmagnetic materials, which allows us to manipulate the charge-spin conversion more freely by taking advantage of the chirality. In this work, we explore the unconventional spin orbit torque of L12-ordered Mn3Pt with a triangular spin structure. We observed an unconventional spin orbit torque along the x-direction for the (001)-oriented L12 Mn3Pt, and found that it has a unique sign reversal behavior relative to the crystalline orientation. This generation of unconventional spin orbit torque for L12-ordered Mn3Pt can be interpreted as stemming from the magnetic spin Hall effect. This report help clarify the correlation between the topologically nontrivial spin structure and charge-spin conversion in non-collinear antiferromagnets.
@article{arxiv.2109.07256,
title = {Observation of unconventional spin polarization induced spin orbit torque in L1$_2$-ordered antiferromagnetic Mn$_3$Pt thin films},
author = {Longjie Yu and Shutaro Karube and Min Liu and Masakiyo Tsunoda and Mikihiko Oogane and Yasuo Ando},
journal= {arXiv preprint arXiv:2109.07256},
year = {2022}
}