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

作者：Li Xiaowei; Zhou Jian; Wang Qian^*; Jena Puru

来源：Journal of Nanoparticle Research, 2012, 14(8): 1056.

DOI：10.1007/s11051-012-1056-5

• Silicon carbide triangular nanoflake
• Kagome lattice
• Magnetic coupling
• Tensile strain
• First principle calculation
• Monte Carlo simulation

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.

• 出版日期2012-8
• 单位北京大学