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FeSn is a topological semimetal (TSM) and kagome antiferromagnet (AFM)composed of alternating Fe3Sn kagome planes and honeycomb Sn planes. Thisunique structure gives rise to exotic features in the band structures such asthe coexistence of Dirac cones and flatbands near the Fermi level, fullyspin-polarized 2D surface Dirac fermions, and the ability to open a large gapin the Dirac cone by reorienting the N\'eel vector. In this work, we report thesynthesis of high quality epitaxial (0001) FeSn films by magnetron sputtering.Using FeSn/Py heterostructures, we show a large exchange bias effect thatreaches an exchange field of 220 Oe at 5 K, providing unambiguous evidence ofantiferromagnetism and strong interlayer exchange coupling in our films. Fieldcycling studies show steep initial training effects, highlighting the complexmagnetic interactions and anisotropy. Importantly, our work provides a simple,alternative means to fabricate FeSn films and heterostructures, making iteasier to explore the topological physics of AFM TSMs and develop FeSn-basedspintronics.

High quality epitaxial thin films and exchange bias of antiferromagnetic Dirac semimetal FeSn