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

In this paper, the structural, electrical, magnetic and optical properties of Dy
8
Fe
16-x
Co
x
(x=0,2,3) compounds have been studied by first principles calculation. Among them, the structural properties show that the atoms of DyFe
2
, Dy
8
Fe
14
Co
2
and Dy
8
Fe
13
Co
3
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 Dy
8
Fe
16-x
Co
x
(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 Dy
8
Fe
16-x
Co
x
(x=0,2,3). It also lays a foundation for improving the sensitivity of Dy
8
Fe
16-x
Co
x
(x=0,2,3) compound optical fiber sensing.