  Kagome materials have attracted a surge of research interest recently,
especially for the ones combining with magnetism, and the ones with weak
interlayer interactions which can fabricate thin devices. However, kagome
materials combining both characters of magnetism and weak interlayer
interactions are rare. Here we investigate a new family of titanium based
kagome materials RETi3Bi4 (RE = Eu, Gd and Sm). The flakes of nanometer
thickness of RETi3Bi4 can be obtained by exfoliation due to the weak interlayer
interactions. According to magnetic measurements, out-of-plane ferromagnetism,
out-of-plane anti-ferromagnetism, and in-plane ferromagnetism are formed for RE
= Eu, Gd, and Sm respectively. The magnetic orders are simple and the
saturation magnetizations can be relatively large since the rare earth elements
solely provide the magnetic moments. Further by angle-resolved photoemission
spectroscopy (ARPES) and first-principles calculations, the electronic
structures of RETi3Bi4 are investigated. The ARPES results are consistent with
the calculations, indicating the bands characteristic with kagome sublattice in
RETi3Bi4. We expect these materials to be promising candidates for observation
of the exotic magnetic topological phases and the related topological quantum
transport studies.
