BAFE12.2XCOXTIXO19 (X=0, 0.6, 0.9) FILMS SYNTHESIZED BY THE SPRAY-ICPTECHNIQUE

Barium ferrite films (BaFe12-2xCoxTixO19; x = 0, 0.6, 0.9) were synthe sized on (001)-oriented sapphire substrates by introducing atomized aq ueous metal nitrate solutions into a high temperature inductively coup led plasma (ICP) generated under atmospheric pressure (the spray-ICP t echnique). All the films exhibited a c-axis orientation. The a-axes of the film and the substrate crossed at 30 degrees. They were about 0.2 mu m thick after 10 min of running, composed of crystallites with siz es of 300-500 nm. At x = 0 , the films were of single phase barium fer rite, consisting of crystallites with clear facets. Doping Co and Ti i nduced the formation of a small amount of (001)-oriented alpha-Fe2O3 a nd degraded the crystallinity and facet of the crystallites. The films exhibited perpendicular magnetic anisotropy. Their saturation magneti zations and coercive forces almost agreed with those of films prepared by sputtering.