A Sensitive Material for Optical Fiber Sensor : — Dy8Fe16-xCox (x=0,2,3): First-principles calculations

Abstract

In this paper, the structural, electrical, magnetic and optical properties of Dy8Fe16-xCox (x=0,2,3) compounds have been studied by first principles calculation. Among them, the structural properties show that the atoms of DyFe2, Dy8Fe14Co2 and Dy8Fe13Co3 are symmetrically located, and each layer forms a triangle. In addition, the calculation of electrical properties shows that the three compounds have obvious metal properties and ferromagnetism. At the same time, an interesting phenomenon was found in the magnetic calculation, The magnetic moment of the same electron orbit of the same element is the same on the premise of ensuring the triangle symmetry of each layer. Finally, in order to study the optical properties of Dy8Fe16-xCox (x=0,2,3), We calculated the optical absorption spectra of the three compounds with photon energy. It is found that the absorption spectrum is red shifted in the ultraviolet range. The above basic physical property calculations could provide theoretical guidance for the optical elements of Dy8Fe16-xCox (x=0,2,3). It also lays a foundation for improving the sensitivity of Dy8Fe16-xCox (x=0,2,3) compound optical fiber sensing.