Anomalous Hall and Nernst effects in epitaxial films of topological kagome magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Fe</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Durga Khadka, T. R. Thapaliya, Sebastian Hurtado Parra, Jiajia Wen, Ryan Need, James M. Kikkawa, S. X. Huang
Abstract
The topological kagome magnet (TKM) ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ 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) ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ 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 ${S}_{yx}$ of $1.26\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{V}\phantom{\rule{0.16em}{0ex}}{\mathrm{K}}^{\ensuremath{-}1}$, 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 ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ films opens the door to explore emergent interfacial physics and create novel spintronic devices based on TKMs by interfacing ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ with other quantum materials and by nanostructure patterning.