"Anomalous Hall and Nernst effects in epitaxial films of topological kagome magnet Fe3Sn2"

Durga Khadka: T. R. Thapaliya, Sebastian Hurtado Parra, Jiajia Wen, Ryan Need, James M. Kikkawa, and S. X. Huang; Physical Review Materials, 08/21/20.

Additional Authors: T. R. Thapaliya, Sebastian Hurtado Parra, Jiajia Wen, Ryan Need, James M. Kikkawa, and S. X. Huang

Abstract:

The topological kagome magnet (TKM) Fe3Sn2 exhibits unusual topological properties, flat electronic bands, and chiral spin textures, making it an exquisite materials platform to explore the interplay between topological band structure, strong electron correlations, and magnetism. Here we report the synthesis of high-quality epitaxial (0001) Fe3Sn2 films with large intrinsic anomalous Hall effect close to that measured in bulk single crystals. In addition, we measured a large, anisotropic anomalous Nernst coefficient Syx of 1.26μVK−1, roughly 2–5 times greater than that of common ferromagnets, suggesting the presence of Berry curvature sources near the Fermi level in this system. Crucially, the realization of high-quality Fe3Sn2 films opens the door to explore emergent interfacial physics and create novel spintronic devices based on TKMs by interfacing Fe3Sn2 with other quantum materials and by nanostructure patterning.