Ba-Ferrite Magneto-optical Recording Media

Abstract

We have studied on the application of Ba-ferrite(BaFe 12 O 19 ) to magneto-optical recording. It was found that CoTi substituted Ba-ferrite(BaCo x Ti x Fe 12-2x O 19 ) films on GGG single crystals had Faraday rotation of 0.9deg/ µ m(λ=780nm) and Curie temperature of 320°C at X=0.9. And CoTi substituted Ba-ferrite films with the perpendicular magnetic anisotropy were obtained on glass substrate by using (111) orientated NiZn-ferrite(Ni x Zn 1-x Fe 2 O 4 ) films for under layer. From these results, Ba-ferrite magneto-optical recording medium which constitution is glass substrate, NiZn-ferrite under layer, CoTi substituted Ba-ferrite magnetic layer and stripe-shaped metal reflective layer for the guide tracks, is proposed from the optimization of each layer.