Non-collinear Kagome antiferromagnets (AFMs) Mn3X (X = Sn, Ga, Ge, Ir, Pt) can generate an anomalous Hall effect (AHE) despite vanishing net magnetization, enabled by broken time-reversal and inversion symmetries. However, strong in-plane anisotropy has limited studies of the AFM-AHE and electronic applications to coplanar spin configurations. Non-coplanar spin textures in these systems have been realized only in low temperature spin-glass states or at interfaces with heavy metals. Here, we report an intrinsic non-coplanar spin configuration persisting up to 400 K in cubic-phase Mn3Ge, originating from coexisting symmetric and antisymmetric exchange interactions. Competing magnetic states associated with this non-coplanar spin configuration give rise to an unconventional AHE with a magnetic-field-induced sign reversal and a hump-like feature. Our findings establish a platform for non-coplanar magnetism in AFM spintronics.
@article{arxiv.2602.09479,
title = {Competing magnetic states in a non-coplanar Kagome magnet},
author = {Xiaodong Hu and Amar Fakhredine and Roger Guzman and Martin Frentrup and Jinan Shi and Giulio I. Lampronti and Sami El-Khatib and Waichuen Tse and Laura Gorzawski and Angelo Di Bernardo and Nadia Stelmashenko and Wu Zhou and Mehmet Egilmez and Danfeng Li and Grzegorz P. Mazur and Mario Cuoco and Carmine Autieri and Jason W. A. Robinson},
journal= {arXiv preprint arXiv:2602.09479},
year = {2026}
}