Speaker
Description
Altermagnets, a new type of unconventional collinear antiferromagnet with spin-splitting arising from non-relativistic symmetry breaking effects, have recently attracted tremendous interests in magnetism and spintronics. Unconventional magnetism actually goes beyond altermagnets, and can also be found in some non-collinear antiferromagnets that possess spin-orbit coupling (SOC). In this talk, we will mainly present our recent neutron scattering and other complementary studies of various topological kagome metals including RV$_6$Sn$_6$ (R = rare earth) [1], RMn$_6$Sn$_6$ [2], and Mn$_3$Sn [3], with the focus on the complex temperature and magnetic-field evolution of non-collinear incommensurate magnetic orders. These non-collinear magnetic spiral phases are also found to be strongly linked to the observed topological Hall effects (THE) or anomalous Hall effects (AHE), thus hinting a fascinating interplay between unconventional magnetism and topologically non-trivial states in these kagome metals via intrinsic engineering of Berry curvature in both k-space and real space. Both competing magnetic exchange interactions and antisymmetric Dzyaloshinskii-Moriya interactions (DMI) could lead to the emergence of these non-collinear magnetic spiral phases. We will also discuss this important aspect based on our observations.
[1] Yishui Zhou, et al., Phys. Rev. Research 6, 043291 (2024).
[2] Yishui Zhou, et al., (in preparation).
[3] Xiao Wang, et al., arXiv:2306.04312 (2023).
E-mail of the corresponding author: y.su@fz-juelich.de