<title>Microscopic origin of optical absorption for Bi-YIG magneto-optic thin film</title>

Abstract

The density of states and orbital energies of (Y3+Fe3+6O2-8)5+ cluster of YIG and (Bi3+Fe36O2-8)5+ cluster of Bi-YIG are calculated by using DV-X(alpha) method. The wavefunctions of some orbits of clusters are given. From total density of state and wavefunctions, it is found that the spin-orbit interaction is increased by the formation of molecular orbit between 3d orbital in Fe3+ and 6p orbital in Bi3+ having a large spin-orbit interaction coefficient and the oscillator strengths of transitions are increased because of bismuth substitution. There are two types of charge transfer transition between -3.2 approximately 3.2 eV on the basis of the total density of energy states of YIG and Bi-YIG films. The optical absorption spectra of Bi-YIG are calculated while x equals 0, 0.4, 1.0 in the wavelength from 0.5 micrometers to 0.9 micrometers . The dependence of absorption coefficient (alpha) on transition linewidths (Gamma) , and spin-orbit splitting energies (Delta) i of coupling orbits are investigated respectively. The influence of Bi3+ ion on optical absorption is obtained.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.