Spin texture of a quasi-two-dimensional ferromagnetic kagome metal

The discovery of low dimensional, long range magnetic order and the study on accurate control of such order have led to the revolution of magnetic storage devices that reformed our daily lives. Two dimensional systems with underlying kagome symmetry is found to be one of the most convenient platforms for the creation and manipulation of various magnetic structures. For example, planar ferromagnetism and non-colinear antiferromagnetism are present in kagome metals Fe₃Sn₂ and Mn₃Sn, respectively, both of which are also recently found to be topologically nontrivial. In this talk, we report our study on the spin texture of Fe₃Sn₂, using both spin-resolved ARPES and DFT calculations. Our results show that the topological Dirac bands at the K points of Fe₃Sn₂ originates from inner layers of the crystal, and are highly spin-polarized along a single spatial direction, realizing in-plane ferromagnetism. This study reveals the low-lying spin texture of a two dimensional topological metal, serving as guidence for spintronic applications on systems alike.