MAGNETIC-PROPERTIES OF POLYCRYSTALLINE BAFE12O19 THIN-FILMS PREPARED FROM METALLORGANIC DECOMPOSITION ON ZRO2-COATED SI SUBSTRATES

In the present work the metallorganic decomposition technique has been applied to grow high-coercivity isotropic polycrystalline BaFe12O19 thin films on ZrO2/Si substrates. The influence of several growth parameters on the magnetic properties, such as the film thickness, the annealing temperature (500-850 degrees C) and the atmosphere during thermal treatments (oxygen and air), is reported. Barium hexaferrite formation starts at 600 degrees C, the reaction being completed within relatively short times; above 700 degrees C, a beneficial effect of an O-2 atmosphere on H-i(c) was found. In these films particles tend to behave as single domain in the thermically demagnetized state.