Evolution of electronic and magnetic properties in Mn- and Co-alloyed ferromagnetic kagome metal Fe3Sn2

Abstract

Kagome metals are an intriguing class of quantum materials as the presence of both flat bands and Dirac points provides access to functional properties present in strongly correlated and topological materials. To fully harness these electronic features, the ability to tune the Fermi level relative to the band positions is needed. Here we explore the structural, electronic and magnetic impacts of substitutional alloying within ferromagnetic kagome metal Fe3Sn2 in thin films grown by molecular beam epitaxy. Transition metals Mn and Co are chosen as substitutes for Fe to reduce or increase the d-band electron count, thereby moving the Fermi level accordingly. We find that Co is not incorporated into the Fe3Sn2 structure but instead results in a two-phase Fe-Co and (Fe,Co)Sn composite. In contrast, Fe3-xMnxSn2 films are realized with x up to 1.0, retaining crystalline quality comparable to the parent phase. The incorporation of Mn repositions the flat bands relative to the Fermi level in a manner consistent with hole-doping, as revealed by hard x-ray photoemission and density functional theory. The Fe3-xMnxSn2 films retain room temperature ferromagnetism, with x-ray magnetic circular dichroism measurements confirming that the Fe and Mn moments are ferromagnetically aligned. The ability to hole-dope this magnetic kagome metal provides a platform for tuning properties such as anomalous Hall and Nernst responses.

23 pages, 4 figures, APL Materials 14, 011114 (2026)

References in corpus (19)

• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Discovery of charge density wave in a correlated kagome lattice antiferromagnet
• Fantastic flat bands and where to find them: The CoSn-type compounds
• Charge density wave orders and enhanced superconductivity under pressure in the kagome metal CsV3Sb5
• Large anomalous Hall effect in the kagome ferromagnet LiMn${}_6$Sn${}_6$
• Intrinsic anomalous Hall effect in Ni-substituted magnetic Weyl semimetal Co3Sn2S2
• Orbital Magneto-Nonlinear Anomalous Hall Effect in Kagome Magnet Fe${}_3$Sn${}_2$
• Anomalous Hall and Nernst effects in epitaxial films of topological kagome magnet Fe3Sn2
• Plethora of tunable Weyl fermions in kagome magnet Fe3Sn2 thin films
• Ferromagnetic helical nodal line and Kane-Mele spin-orbit coupling in kagome metal Fe3Sn2
• Atomic Layer Epitaxy of Kagome Magnet Fe${}_3$Sn${}_2$ and Sn-modulated Heterostructures
• Giant periodic pseudo-magnetic fields in strained kagome magnet FeSn epitaxial films on SrTiO${}_3$(111) substrate
• Flat-Band Itinerant Antiferromagnetism in the Kagome Metal CoSn1-xInx
• Epitaxial Kagome Thin Films as a Platform for Topological Flat Bands
• Spin waves and orbital contribution to ferromagnetism in a topological metal
• Effect of electron- and hole-doping on properties of kagome-lattice ferromagnet Fe3Sn2
• Atomic Layer Molecular Beam Epitaxy of Kagome Magnet RMn${}_6$Sn${}_6$ (R = Er, Tb) Thin Films