Magnetic Properties of Fe₃Sn₂/CoSn Kagome Metal Superlattices

Kagome metals are an interesting family of quantum materials owing to their rich array of magnetic and electronic ordering phenomena and the presence of band features that arise from the geometric kagome sub-lattice. Seeking to better understand the relationship between dimensionality and magnetism in these materials, we have synthesized a series of superlattices consisting of ferromagnetic Fe₃Sn₂ and diamagnetic CoSn kagome metals using molecular beam epitaxy. The superlattice structure is confirmed via scanning transmission electron microscopy with energy dispersive x-ray spectroscopy, x-ray diffraction, and neutron reflectometry. Using polarized neutron reflectometry, we reveal a magnetization modulation along the growth direction with strong in-plane ferromagnetism present in Fe₃Sn₂ even in layers less than 5 nm in thickness. This new superlattice system serves as a platform for understanding the impact of finite thickness and interfacial perturbations on magnetism within kagome metals.