An investigation on the magneto-optical enhancement in Ni-substituted barium ferrites

Abstract

The calculation of the contribution of the intraionic electric-dipole transitions between the 3d8 and 3d7 4p configurations of Ni2+ ions doped in barium ferrites to the Faraday effect is presented. It is shown that such transition is an important origin of the Ni contribution to the Faraday effect in the Ni-substituted barium ferrite. The energy difference between the mean energies of the 3d8 and 3d7 4p configurations is large. So the 496-nm wavelength (photon energy 2.5 eV) is far from the resonance frequencies. However, since the molecular field upon the Ni2+ ions is very large, the Faraday rotation at 496 nm produced by such transition is still large. Other possible origins are discussed briefly.

Microstructure and magneto-optical properties of Pr–Ni substituted Ba hexaferrite films prepared by sputtering

“…Abe and Gomi reported that tetrahedrally coordinated Co 2ϩ in hexagonal ferrites gives rise to a large MO effect due to the 4 A 2 -4 T 1 ( P) and 4 A 2 -4 T 1 (F) crystal-field transitions around 2.0 and 0.8 eV, respectively. 6 However, with the exception of the above and a recent theoretical study, 7 few studies have been performed on the MO effect of the hexaferrites. This is primarily because the hexaferrite has a complicated crystal structure that makes detailed analysis of the spectrum particularly difficult.…”