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

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 GdCo 2 . Strikingly, a giant anomalous Hall conductivity ≈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 ( ≈3.5 µV K −1 at 250 K) and transverse thermoelectric conductivity ( ≈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 GdCo 2 , correlating with the M‐shaped MR ( H ) behavior. The remarkable observations of stable spontaneous Skyrmion bubbles and vortices in GdCo 2 further substantiate the above conjecture. This study highlights the coexistence of multiple intriguing physical phenomena, making the Kagomé ferromagnet GdCo 2 serve as a promising candidate for exploring transverse transport effects and the extremely rich underlying physics.