Coexistence of Giant Transverse Transport Properties and Complex Spin Configuration in Polycrystalline Kagomé Ferromagnet GdCo₂.

Authors

Chaoxin Qiu, Xiaolian Liu, Cong Xiao, Hanxiao Chen, Shengcan Ma, Wei Ren, Wei Li, Yimai Wu, Liting Jiang, Jing Gan, Xiaohua Luo, Changcai Chen, Chunsheng Fang, Lizhong Zhao, Xuefeng Zhang

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e04495. Aug 30, 2025. Epub Aug 30, 2025.

Abstract

Kagomé lattice magnets have recently garnered significant interest due to the pronounced transverse transport characteristics, particularly in thermoelectric and spintronic applications, stemming from the interplay between topology and magnetism. Here, a comprehensive investigation of the magnetic, electrical, and thermoelectric transport properties, as well as the complex spin configurations, is conducted in a polycrystalline Kagomé ferromagnet GdCo₂. Strikingly, a giant anomalous Hall conductivity ${\sigma }_{yx}^A$ ≈2125 S cm^-1 is obtained at T = 10 K, which is primarily governed by the extrinsic skew-scattering mechanism. Simultaneously, a large anomalous Nernst effect, including both the Nernst coefficient ( $S_{yx}^A$ ≈3.5 µV K^-1 at 250 K) and transverse thermoelectric conductivity ( ${\alpha }_{yx}^A$ ≈3.2 A m^-1 K^-1 at 210 K) are achieved, which surpass most of the typical Kagomé magnets. In addition, both appreciable topological Hall and Nernst effects imply the emergence of nontrivial spin structures in GdCo₂, correlating with the M-shaped MR(H) behavior. The remarkable observations of stable spontaneous Skyrmion bubbles and vortices in GdCo₂ further substantiate the above conjecture. This study highlights the coexistence of multiple intriguing physical phenomena, making the Kagomé ferromagnet GdCo₂ serve as a promising candidate for exploring transverse transport effects and the extremely rich underlying physics.

PMID:
40884122
Bibliographic data and abstract were imported from PubMed on 30 Aug 2025.

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