MICROSTRUCTURE AND MAGNETIC-PROPERTIES OF SPINEL AND HEXAGONAL FERRIMAGNETIC FILMS PREPARED BY PULSED-LASER DEPOSITION

Thin films of NiFe2O4, CoFe2O4, Ni0.5Zn0.5Fe2O4, and BaFe12O19, deposi ted at temperatures higher than 500 degrees C are isotropic and polycr ystalline, the thickness (25 nm up to 1.5 mu m), the grain size (50 nm to 1 mu m) and surface roughness (1 to 100 nm) depending upon deposit ion parameters. Saturation magnetizations are close to the bulk values , but coercivities are rather high: up to 500 Oe for Ni-ferrites and m ore than 3 kOe for the hexaferrite.