Effects of atoms and molecules adsorption on electronic and magnetic properties of s-triazine with embedded Fe atom: DFT investigations

Abstract

We employ first-principles calculations to study the mechanical, geometrical, electronic and magnetic properties of Fe atom embedded s-triazine ($\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$) system under the influence of external environment. Our results show that the binding energy of $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ can be modulated by an applied tensile deformation and perpendicular electric field. The non-magnetic semiconducting property of pure s-triazine sheet (${\mathrm C_6}{\mathrm N_6}$) is found to change upon embedding of Fe atom in the porous site of the sheet. It is revealed that the $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ system exhibits half-metallic electronic character with a magnetic moment in the the order similar to that of an isolated Fe atom. Furthermore, electronic and magnetic properties of the $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ systems are preserved up to a maximum value of 10 V/nm in electric field strength and 6\% tensile strain. Interestingly, we find that the half-metallic electronic character of $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ system can be tuned into a semiconductor via adsorption of atoms and molecules into the $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ system. The magnetic moment of $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ with adsorbed atoms/molecules is also modified. Our findings may serve as a guide for future applications of $\mathrm{Fe}$@${\mathrm C_6}{\mathrm N_6}$ structures in spintronics devices.