Magnetic properties of two dimensional silicon carbide triangular nanoflakes-based kagome lattices

Two-dimensional (2D) magnetic kagome lattices are constructed using silicon carbide triangular nanoflakes (SiC-TNFs). Two types of structures with alternating Si and C atoms are studied: the first one is constructed using the C-edged SiC-TNFs as the building blocks and C atoms as the linkers of kagome sites (TNFN–C–TNFN) while the second one is composed of the Si-edged SiC-TNFs with Si atoms as linkers (TNFN–Si–TNFN). Using density functional theory-based calculations, we show that the fully relaxed TNFN–C–TNFN retains the morphology of regular kagome lattice and is ferromagnetism. On the other hand, the TNFN–Si–TNFN structure is deformed and antiferromagnetic. However, the ground state of TNFN–Si–TNFN structure can be transformed from the antiferromagnetic to ferromagnetic state by applying tensile strain. Monte Carlo simulations indicate that the SiC-TNFs-based kagome lattices can be ferromagnetic at room temperature.