Microstructure and magnetic properties of spinel and hexagonal ferrimagnetic films prepared by pulsed laser deposition

Abstract Thin films of NiFe 2 O 4 , CoFe 2 O 4 , Ni 0.5 Zn 0.5 Fe 2 O 4 , and BaFe 12 O 19 , deposited at temperatures higher than 500°C are isotropic and polycrystalline, the thickness (25 nm up to 1.5 μm), the grain size (50 nm to 1 μm) and surface roughness (1 to 100 nm) depending upon deposition parameters. Saturation magnetizations are close to the bulk values, but coercivities are rather high: up to 500 Oe for Ni-ferrites and more than 3 kOe for the hexaferrite.