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 (TNF N –C–TNF N ) while the second one is composed of the Si-edged SiC-TNFs with Si atoms as linkers (TNF N –Si–TNF N ). Using density functional theory-based calculations, we show that the fully relaxed TNF N –C–TNF N retains the morphology of regular kagome lattice and is ferromagnetism. On the other hand, the TNF N –Si–TNF N structure is deformed and antiferromagnetic. However, the ground state of TNF N –Si–TNF N 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.